Orthostatic proteinuria is a usually harmless condition where protein shows up in the urine during the day when someone is standing or active. It is most often found in children, teenagers, and young adults, and many people with orthostatic proteinuria feel completely well. For some, the first sign may be a small change they brush off at first, but early symptoms of orthostatic proteinuria are often absent. Orthostatic proteinuria does not usually shorten life, and it often improves or goes away with age. Treatment is usually not needed, but doctors often repeat urine tests and check blood pressure to make sure orthostatic proteinuria stays benign.
How many people live with Orthostatic proteinuria?
There is no single direct worldwide count for orthostatic proteinuria, and estimates vary because studies use different age groups and urine-testing methods, but the widely cited rate of about 2% to 5% in teens suggests roughly 26 to 65 million young people worldwide (StatPearls, 2023; WHO, 2023). Using that same range, the United States likely has about 0.8 to 2.1 million young people living with it, based on the size of the U.S. 10-to-19-year-old population; this is an estimate, not a direct count (StatPearls, 2023; U.S. Census Bureau, 2023).
Overview
Orthostatic proteinuriaSymptoms
Orthostatic proteinuria usually causes no symptoms and is often found on a routine urine test. People with orthostatic proteinuria may feel completely well, with protein appearing in urine mainly after standing.
Outlook and prognosis
Orthostatic proteinuria usually has an excellent outlook. For many people, the protein in urine appears mainly when upright, kidney function stays normal, and the condition often lessens or goes away over time with routine follow-up.
Causes and risk factors
The exact cause of orthostatic proteinuria is unclear, but it is linked to protein leaking into urine while upright. It is most common in teenagers and young adults, especially those who are tall and thin. It is not usually caused by diet, exercise, or inherited kidney disease.
Genetic influences
Genetics do not seem to play a major role in orthostatic proteinuria, and most cases are not inherited. If protein in the urine is heavy, persistent, or runs in the family, doctors may look for other kidney conditions with a genetic cause.
Diagnosis
Orthostatic proteinuria is diagnosed with urine tests that compare a daytime sample after being upright with a first-morning sample taken after lying down overnight. Blood tests may also check kidney function and help rule out other causes.
Treatment and drugs
Orthostatic proteinuria usually does not need medicine. Treatment is regular urine checks, blood pressure monitoring, and follow-up to confirm protein appears mainly when upright. If protein levels rise or other kidney signs appear, doctors look for another cause.
Symptoms
Most people with orthostatic proteinuria feel completely well and only learn about it after a routine urine test. For many people with orthostatic proteinuria, there are no obvious early symptoms of orthostatic proteinuria at all. The main clue is protein in the urine when standing or active, with little or none after lying down. Because it is usually benign, symptoms like swelling or pain suggest something else may be going on.
Most people with orthostatic proteinuria feel normal in day-to-day life. It is often found by chance on a school, sports, work, or routine urine test.
Some people notice urine that looks extra bubbly or foamy, especially later in the day. This can happen when more protein is leaking into the urine while you are upright.
A first-morning urine sample is often normal after lying down overnight. Protein is more likely to show up in urine collected after standing, walking, or being active.
Swelling, blood in the urine, high blood pressure, or pain are not typical of orthostatic proteinuria. If these happen, a healthcare professional may look for another cause.
How people usually first notice Orthostatic proteinuria?
Orthostatic proteinuria is often first noticed after a routine urine test shows protein in the urine even though you feel well and have no other kidney symptoms. A common clue is that the protein shows up in a daytime urine sample, after you have been standing or walking, but is much lower or absent in a first-morning sample taken after lying down overnight. For many people, this pattern is found by chance during a school, sports, insurance, or regular checkup, which is why the first signs of orthostatic proteinuria are usually a lab finding rather than something you can feel.
Types of Orthostatic proteinuria
Orthostatic proteinuria does not have widely accepted subtypes. Sometimes, symptoms cluster together in recognizable ways, but with orthostatic proteinuria the main pattern is protein in the urine when someone is upright and little to none after lying down. In practice, discussions about types of orthostatic proteinuria usually reflect how much protein is present or whether another kidney problem is also being considered, rather than true separate variants.
No distinct types
No distinct types of orthostatic proteinuria are widely recognized. Symptoms usually do not differ by subtype because accepted subtypes have not been defined.
Can I slow down the onset of symptoms?
For orthostatic proteinuria, which means protein shows up in the urine mainly when someone is standing, there is no good evidence that diet, exercise, or medicine can meaningfully delay it, largely because it is usually harmless, often causes no symptoms, and often improves on its own with age. General healthy habits like staying hydrated and keeping blood pressure in a healthy range support overall kidney health, but they have not been shown to prevent this condition or delay when it starts. Doctors often recommend simple follow-up urine tests to make sure nothing else is causing the protein, and the good news is that many people with orthostatic proteinuria do well over time.
What genetics can tell you about symptoms
For most people with orthostatic proteinuria, genetics does not give much useful information about symptoms, because this condition is usually linked to body position and kidney blood flow rather than a known inherited gene change. There is no well-established pattern showing that common genetic differences predict which symptoms will appear, how severe the protein leakage will be, or the age when it starts. In practice, genetics is usually not part of evaluating this condition unless there are other signs that suggest a different kidney disorder that can run in families.
Causes and risk factors
If you are looking into the causes of orthostatic proteinuria, the main trigger is standing up rather than a food or infection. When someone stands, changes in kidney blood flow and pressure can let a small amount of protein leak into the urine. Orthostatic proteinuria is seen most often in older children, teens, and young adults, and it may be more common in people with a lean body build. Long periods of standing, daytime activity, and sometimes dehydration can make it show up more clearly on a urine test. Researchers are still learning how these pieces fit together, and there is no proven single gene or strong lifestyle cause in most people with orthostatic proteinuria.
What are the most common causes or risk factors?
Orthostatic proteinuria usually happens because standing changes blood flow and pressure in the kidneys, so a small amount of protein leaks into the urine when someone is upright but not when they are lying down. It is most common in older children, teenagers, and young adults, especially people who are tall and thin, and it may be noticed more after spending a lot of time standing or being active during the day. There is no clear inherited cause that has been strongly proven, and in most people it is not a sign of lasting kidney disease.
Environmental and biological risk factors
Orthostatic proteinuria is a pattern where protein shows up in the urine mainly after someone has been standing or walking, and it usually fades after lying down. If you are wondering who is at risk for orthostatic proteinuria, it is seen most often in otherwise healthy older children, teenagers, and young adults. Doctors often group risks into internal (biological) and external (environmental). In this condition, the main risks are linked to body position and temporary blood-flow changes around the kidneys.
Orthostatic proteinuria is most common in older children, teens, and young adults. It becomes much less common after about age 30, making younger age one of the strongest biological risk factors. It is also reported somewhat more often in boys and young men.
Many people with orthostatic proteinuria have a tall, slim body build. A lean frame may make pressure changes around the kidney veins more noticeable when standing.
Spending long periods upright is the main external trigger for this pattern. Protein may appear in the urine during the day after standing or walking, then be absent in a first-morning urine sample.
Some people have stronger shifts in kidney blood pressure and filtration when they stand up. That temporary change can let small amounts of protein pass into the urine.
Genetic risk factors
Orthostatic proteinuria usually is not linked to a clear inherited cause, and no single gene has been proven to cause the classic form. When families ask about the genetic causes of orthostatic proteinuria, the main point is that genes are usually not the driver in otherwise healthy young people. If protein in the urine continues even after lying down, or if kidney disease seems to run in the family, doctors may look for a different inherited kidney condition instead. In some cases, genetic testing can give a clearer picture of your personal risk when the pattern does not fit classic orthostatic proteinuria.
No known gene: Researchers have not identified a single gene that causes classic orthostatic proteinuria. That makes a strong inherited cause less likely in people whose urine protein appears only when they are upright.
Family history: A strong family history of kidney disease, blood in the urine, or early kidney failure raises concern for a different inherited condition. In that setting, doctors may check whether the proteinuria is truly orthostatic proteinuria or something else.
Inherited disorders: Some genetic conditions that affect the kidney filters can cause protein in the urine and may look similar at first. If protein is present both day and night, or kidney function is not normal, doctors usually think beyond orthostatic proteinuria.
Genetic testing: Genetic testing is not routine when the pattern clearly matches benign orthostatic proteinuria. It may be considered when early symptoms of orthostatic proteinuria overlap with signs of inherited kidney disease, especially if several relatives are affected.
Lifestyle risk factors
Orthostatic proteinuria is usually influenced more by body position and daily habits than by harmful lifestyle exposures. In most people, lifestyle habits do not create permanent kidney disease, but they can increase how often protein appears in the urine during the day. When discussing lifestyle risk factors for orthostatic proteinuria, the main issue is what tends to trigger or amplify daytime protein leakage.
Standing for long periods is the lifestyle pattern most closely linked to orthostatic proteinuria. Protein in the urine often rises while upright and falls again after lying down.
Strenuous workouts can temporarily increase urinary protein loss and make orthostatic proteinuria more noticeable. High-intensity training close to urine testing can also make results look worse than usual.
Dehydration can concentrate the urine and may increase the apparent amount of protein detected. Drinking enough fluid may help reduce exaggerated daytime urine abnormalities.
Very salty eating patterns can promote fluid shifts and may raise urinary protein excretion in some people. Keeping sodium intake moderate may help avoid extra stress on kidney filtration.
Risk prevention
Orthostatic proteinuria usually cannot be fully prevented, because it often relates to how the kidneys handle blood flow when someone is upright, especially during the teen years. The good news is that it is often harmless and may improve with age. Prevention is flexible—it adapts to your life and health background. In practice, the focus is on lowering strain on the body, avoiding dehydration, and making sure protein in the urine is not coming from another kidney problem.
Dehydration can concentrate the urine and may make protein levels look higher during the day. Drinking enough fluids, especially in hot weather or during sports, may help reduce this effect.
Standing for long periods can play a role in orthostatic proteinuria in some people. Taking sitting breaks and shifting position during the day may help limit urine protein after being upright for hours.
Very intense exercise can temporarily raise protein in the urine, even in people without kidney disease. If early symptoms of orthostatic proteinuria are being checked, it may help to avoid hard workouts right before urine testing unless your clinician says otherwise.
High blood pressure can point to a different kidney issue rather than simple orthostatic proteinuria. Regular blood pressure checks and follow-up visits help make sure nothing more serious is being missed.
Can you prevent Orthostatic proteinuria?
No, there is no proven way to prevent orthostatic proteinuria, which is a type of protein in the urine that tends to show up when someone has been standing or active. It often happens in otherwise healthy children, teens, and young adults, and it is not usually caused by something you did or did not do. General healthy habits can support overall kidney health, but they have not been shown to prevent this specific condition.
Transmission
Orthostatic proteinuria is not contagious, so it cannot be passed from person to person through touching, kissing, coughing, sex, food, or blood. In plain terms, it is not infectious at all.
Instead, orthostatic proteinuria is usually a body-position pattern in which protein shows up in the urine when someone is standing or active and often fades after lying down. It is also not usually thought of as a condition that runs strongly in families, so concerns about genetic transmission of Orthostatic proteinuria are generally not the main issue.
When to test your genes
For orthostatic proteinuria, genetic testing is usually not needed. This condition is typically benign and is confirmed with urine testing that compares a first-morning sample with daytime urine. Gene testing may be considered only if proteinuria is persistent, heavy, or paired with kidney disease, hearing loss, or a strong family history.
Diagnosis
Orthostatic proteinuria is usually found when urine tests show protein during the day but little or none after lying down overnight. It often comes up in children, teens, and young adults who otherwise feel well, sometimes after a school physical or routine check-up. Doctors usually begin by confirming that the protein appears mainly when someone is upright, which is the key clue in how orthostatic proteinuria is diagnosed.
A simple urine test can show whether protein is present. Because results can change through the day, one positive sample does not by itself confirm orthostatic proteinuria.
Doctors often ask for a urine sample right after waking, before much standing or walking. If this sample is normal or nearly normal, it supports orthostatic proteinuria rather than ongoing protein loss.
A later sample taken after being upright for several hours is compared with the first morning sample. Protein showing up mainly in the daytime sample is a classic pattern for this condition.
The lab may measure the protein-to-creatinine ratio instead of collecting urine for a full 24 hours. This helps estimate how much protein is being lost and whether the amount fits the usual pattern of orthostatic proteinuria.
How is Orthostatic proteinuria diagnosed?
Orthostatic proteinuria is usually diagnosed with urine tests that compare a first-morning sample, taken after lying down all night, with a later sample collected after being up and moving around. If protein shows up mainly in the daytime sample and not in the first-morning sample, this strongly points to orthostatic proteinuria rather than ongoing kidney disease. Doctors may also check blood pressure, do blood tests to see how well the kidneys are working, and sometimes collect urine over 24 hours to make sure there is not another cause.
Stages of Orthostatic proteinuria
Orthostatic proteinuria does not have defined progression stages. This is because it usually is not a steadily worsening disease; instead, protein shows up in the urine mainly when someone has been upright and often goes away in a sample taken after lying down. Doctors usually start with a conversation about when protein in the urine was found, then compare urine samples taken at different times, such as a first-morning sample and a daytime sample, which is a key part of how orthostatic proteinuria is diagnosed. Monitoring often includes repeat urine tests and sometimes blood pressure, blood tests, and kidney function checks to make sure there are no signs of another kidney problem.
Outlook and prognosis
The outlook for people with orthostatic proteinuria is generally excellent, especially in children and adolescents, because kidney function usually remains normal over time. In many cases the protein in the urine lessens or disappears with age, and long-term studies have not shown a higher risk of progressive kidney disease when the diagnosis is isolated and no other abnormalities are present. Mortality is not increased from orthostatic proteinuria itself. Ongoing follow-up is still important to confirm that the proteinuria remains positional and that high blood pressure, reduced kidney function, blood in the urine, or other signs of kidney disease do not emerge. If those warning features appear, the outlook depends more on the underlying cause than on orthostatic proteinuria alone.
Long-term effects
Orthostatic proteinuria usually has a reassuring outlook. It means protein shows up in the urine mainly when someone is upright and is often found by chance on a school, sports, or routine checkup. For most children, teens, and young adults, the long term effects of orthostatic proteinuria are minimal, and kidney health stays normal over time. It’s important to remember that long-term doesn’t always mean progressive.
In most people with orthostatic proteinuria, kidney function remains normal for years. This condition by itself usually does not lead to chronic kidney disease or kidney failure.
Some may continue to have small amounts of protein in daytime urine samples, especially during the teen years. This often lessens or disappears with age, and a first-morning urine sample is usually normal.
Blood pressure is usually not affected by orthostatic proteinuria alone. If high blood pressure develops later, doctors often look for another cause rather than assuming this condition is responsible.
Children and teens with orthostatic proteinuria usually grow, exercise, and go about daily life normally. Many living with orthostatic proteinuria do not develop limits in energy, school, sports, or work because of it.
How is it to live with Orthostatic proteinuria?
For many people, living with orthostatic proteinuria means living with a lab finding more than with an illness: protein shows up in the urine when you are upright, but it often disappears after lying down and usually does not cause symptoms. Day to day, most people feel entirely well and can go to school, work, exercise, and live normally, with the main practical difference being occasional urine tests and follow-up visits to make sure kidney function stays normal. For family members, this can bring some understandable worry at first, but in most cases the condition is benign, so the impact on others is usually emotional rather than physical, and reassurance plus routine monitoring are often the biggest parts of care.
Treatment and drugs
Orthostatic proteinuria is usually managed with reassurance and follow-up rather than active treatment, because the extra protein in the urine often appears only when someone is standing and the kidneys are otherwise healthy. In many living with orthostatic proteinuria, there is no need for medicine, surgery, or a special diet, and day-to-day life can stay normal. Your doctor may suggest repeat urine tests, often including a first-morning sample, to confirm the pattern and make sure there are no signs of another kidney problem. Not every treatment works the same way for every person, so if protein levels rise, blood pressure changes, or swelling appears, doctors may look for another cause and treat that instead.
Can you cure Orthostatic proteinuria?
Orthostatic proteinuria usually does not need a cure, because it is often harmless and often goes away on its own over time, especially in children, teens, and young adults. There is no specific medicine to fix it, but doctors may check urine tests and kidney health from time to time to make sure nothing else is causing the protein in the urine.
Non-drug treatment
Orthostatic proteinuria usually does not disrupt daily life, and many living with it feel completely well. In most cases, treatment is not about medicines but about checking that the kidneys stay healthy over time and supporting simple habits that may help. For many, treatment begins not at the pharmacy, but with follow-up urine tests, blood pressure checks, and practical steps such as staying well hydrated and avoiding long periods of standing when possible. If you are wondering how to manage orthostatic proteinuria, the main approach is monitoring and reassurance rather than intensive therapy.
Repeat urine testing is often the main non-drug approach for orthostatic proteinuria. This helps confirm that protein is mainly showing up when someone is upright and not signaling a more serious kidney problem.
Checking blood pressure over time can help make sure the kidneys are not under added strain. A normal blood pressure pattern is reassuring in people with orthostatic proteinuria.
Drinking enough fluids may help support normal kidney function and can be especially useful on hot days or with exercise. Some may find symptoms linked to standing, such as lightheadedness, feel less noticeable when they are well hydrated.
Avoiding very long periods of standing may reduce the posture-related protein leak seen in orthostatic proteinuria. For example, a teen who stands through a long school event may benefit from sitting down for short breaks.
Your genes may have an impact on how drugs work for you
For orthostatic proteinuria, genes usually do not play a known or important role in choosing treatment, mainly because this condition is often harmless and usually does not need medicine. Most people are simply watched over time with urine checks and blood pressure checks, rather than treated with drugs, so genetic testing to predict medication response is not a routine part of care here. If protein in the urine turns out to be from a different kidney problem instead, the treatment plan may change, but that is about the other condition, not orthostatic proteinuria itself.
Pharmacological treatments
Orthostatic proteinuria usually does not need medicine, because the protein in the urine appears mainly when someone is upright and often does not reflect ongoing kidney damage. Medication can feel like a big step, but treatment for orthostatic proteinuria is most often careful follow-up with repeat urine checks and blood pressure monitoring rather than a prescription. If protein in the urine is higher than expected, shows up even when lying down, or comes with other abnormal findings, doctors may look for another kidney condition and treat that instead.
There is no standard medication for orthostatic proteinuria itself. In most children, teens, and young adults, doctors focus on monitoring rather than drug treatment.
Medicines such as lisinopril or enalapril are not used for uncomplicated orthostatic proteinuria. They may be considered only if testing suggests a different kidney disease with persistent protein loss or high blood pressure.
Drugs like losartan or valsartan are another option when protein in the urine is due to another kidney problem, not orthostatic proteinuria alone. These medicines can help lower pressure inside the kidney's filtering units and reduce ongoing protein leakage.
Diuretics, antibiotics, and steroid medicines do not treat ordinary orthostatic proteinuria unless there is another diagnosed condition that calls for them. Never stop or change a prescription without checking with your healthcare provider.
Genetic influences
Most people with orthostatic proteinuria do not have it because of a single inherited gene change. It’s natural to ask whether family history plays a role. In general, orthostatic proteinuria is not considered a strongly genetic condition, and it often happens in otherwise healthy children, teens, and young adults without a clear family pattern. Researchers think body position, blood flow around the kidneys, and individual anatomy matter more than inherited risk in most cases.
That said, protein in the urine can also happen with inherited kidney disorders, so doctors sometimes look more closely if the amount is high, if it does not go away in a first-morning urine sample, or if there is blood in the urine, high blood pressure, or reduced kidney function. For many, this can mean that orthostatic proteinuria itself is benign, while the main job is making sure it is not an early sign of a different kidney condition. So if you are wondering, is orthostatic proteinuria hereditary, the usual answer is no, not by itself, though genetics may matter if testing suggests another kidney disease.
Is Orthostatic proteinuria genetic?
Genetics do not seem to play a major role in orthostatic proteinuria, and most cases are not inherited. If protein in the urine is heavy, persistent, or runs in the family, doctors may look for other kidney conditions with a genetic cause.
Having a genetic risk is not necessarily a diagnosis
Genetic variants are common in the general population and are a normal part of human biology. Most do not directly affect health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definitive diagnosis, especially when multiple genes and environmental factors play a role. In some cases, though, a single well-characterized variant in a specific gene can be enough to confirm a diagnosis.
Pharmacogenetics—how genetics influence drug effects
For many living with orthostatic proteinuria, the biggest challenge is often the stress of repeat urine checks rather than daily symptoms. Genetics is only one factor, and in orthostatic proteinuria they usually do not guide treatment because this pattern is usually harmless and often needs observation, not medication. There is no standard drug treatment for orthostatic proteinuria itself, and no well-established pharmacogenetic test is used to choose or dose medicines for it. If protein in the urine is high, remains present in a first-morning sample, or comes with high blood pressure or reduced kidney function, doctors may look for another kidney condition instead. In those cases, inherited kidney disorders can matter, because genetic findings may change the diagnosis and point to treatment for the underlying disease rather than the orthostatic pattern alone. So when people ask about genetic testing for orthostatic proteinuria, it is usually most helpful only when the test results suggest that something more than simple orthostatic proteinuria may be going on.
Interactions with other conditions
People with orthostatic proteinuria often feel well, but the main issue is making sure the protein in the urine is not coming from another health problem. This connection brings us to how the condition interacts with others: doctors usually want to rule out kidney disease, diabetes, high blood pressure, or autoimmune illnesses such as lupus, because those can also cause protein in the urine and may need very different care. For many living with orthostatic proteinuria, this means urine tests may be checked in both a first-morning sample and a daytime sample, since protein that appears only after being upright points more toward orthostatic proteinuria than ongoing kidney damage. If someone also has swelling, blood in the urine, reduced kidney function, or persistently high protein levels, that is less typical and may suggest another condition is present as well. In children, teens, and young adults, orthostatic proteinuria is usually considered benign, but it should not be assumed to explain every abnormal urine test if other symptoms are developing. Talk with your doctor about how your conditions may influence each other, especially if there is a family history of kidney disease or other test results are abnormal.
How genes can cause diseases
Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.
Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.
What other conditions can cause similar symptoms to Orthostatic proteinuria?
Protein in the urine like that seen in orthostatic proteinuria can also happen with other kidney problems, including kidney inflammation or early kidney damage from diabetes or high blood pressure. It may also show up for a short time with fever, dehydration, heavy exercise, or a urine infection, so doctors often repeat urine testing and compare samples taken while lying down and later in the day.
History
A routine urine test can be unsettling when it shows protein, especially if someone feels completely well. That is often how the story of orthostatic proteinuria begins in real life: a healthy child, teen, or young adult has a school, sports, or checkup urine sample that looks abnormal, then a repeat sample first thing in the morning looks normal.
Since the earliest days of medicine, efforts have been made to understand why protein sometimes appears in urine without other signs of kidney disease. Doctors gradually noticed a pattern in some otherwise healthy young people: the protein showed up more after being upright during the day and faded after a night lying down. Before modern lab testing, this was easy to miss, because the amount of protein could change from one sample to the next.
As medical science evolved, urine testing became more reliable, and that helped separate orthostatic proteinuria from more serious kidney problems. By the late 19th and early 20th centuries, physicians were describing this posture-related pattern more clearly, especially in adolescents. Over time, they learned that some people had protein in the urine mainly when standing or walking around, while urine collected after resting flat was normal or close to normal.
This mattered because early descriptions of protein in the urine often caused understandable concern. In the past, proteinuria of any kind could be seen as a warning sign of long-term kidney trouble. With better follow-up over months and years, doctors recognized that many living with orthostatic proteinuria stayed healthy and did not develop the kinds of kidney damage seen in other conditions.
That shift in understanding changed everyday care. Instead of assuming the worst from a single dipstick result, clinicians began using timed testing, first-morning urine samples, and repeat checks to confirm the pattern. This history is part of why people with orthostatic proteinuria are often advised to have the finding verified carefully rather than judged from one daytime sample alone.
Today, orthostatic proteinuria is generally understood as a usually benign, posture-related finding, most often seen in children, teenagers, and young adults. Knowing this history helps explain why the early symptoms of orthostatic proteinuria can be confusing: there are often no symptoms at all, just an unexpected lab result that looks worrying until the timing of the urine sample is taken into account.