Urine Total Protein, Random (Quantitative)
The amount of protein in one urine sample. Small amounts are normal, and the number shifts with how diluted your urine is.
AI-drafted. Awaiting verificationLOINC 2888-6
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What it is
Healthy kidneys keep most protein in your blood and let only a small amount into your urine. This test measures all the protein in one urine sample, including albumin and other proteins, and reports it in milligrams per deciliter (mg/dL). Because the number depends on how much water is in your urine, labs often pair it with a urine creatinine test to give a protein-to-creatinine ratio.
Why it matters
Protein in the urine can be one of the earliest signs that the kidneys' filters are under strain, often before you feel any symptoms. It also shows up for harmless, short-lived reasons such as hard exercise or dehydration. A single result is a starting point. Your clinician usually repeats it and reads it with a ratio, blood tests and your health history.
If it’s high
A higher result means more protein than usual was in this sample. Many everyday things can cause this, including a concentrated sample, a hard workout, stress or a urinary infection, and these often settle on their own. Higher values that last can also be linked to kidney conditions, so a repeat test is the usual next step.
Common causes
- A concentrated sample from dehydration or not drinking much
- Strenuous exercise
- A urinary tract infection
- Menstrual blood or vaginal fluid mixing with the sample
- Recent X-ray contrast dye
- Pregnancy, stress or diet (short-lived rises)
- Kidney conditions, including damage from diabetes or high blood pressure
- Heart failure
- Blood pressure problems in pregnancy, such as preeclampsia
- Bladder problems, and, rarely, multiple myeloma
What can help
- Ask your clinician whether to repeat the test on a first-morning sample
- Ask whether a protein-to-creatinine or albumin-to-creatinine ratio would be easier to interpret
- Tell the lab or your clinician about recent hard exercise, illness, your period or X-ray dye
Usual ranges
What labs print as the reference range, by who was tested. Ranges differ a little between labs, so the range on your own report is the one your result is judged against.
For adults: 0–14 mg/dL. Source: MedlinePlus Medical Encyclopedia (NIH National Library of Medicine).
- Adults (this one applies)0–14 mg/dL
Source: MedlinePlus Medical Encyclopedia (NIH National Library of Medicine)
What can affect your result
- How dilute or concentrated your urine is
- Hard exercise in the day or so before the sample
- Menstrual blood, vaginal discharge or a urinary infection
- Recent X-ray contrast dye
- Posture: some people release protein only after hours of standing (orthostatic proteinuria), which is why a first-morning sample is used to sort this out
- The lab's method, since there is no standard reference method for urine total protein
- Very dilute or very concentrated urine changes the number even when the amount of protein your kidneys release is the same. Labs and clinicians often pair it with urine creatinine to correct for this.
- Dehydration, strenuous exercise, a urinary tract infection, and menstrual blood or vaginal fluid in the sample can all raise it.
- X-ray contrast dye from a scan in the 3 days before the test can affect the result (MedlinePlus).
- Most labs measure total protein with turbidimetric or colorimetric methods. These react more strongly with albumin than with other proteins, and ARUP notes its method underestimates urinary light chains.
- Some labs reject urine that was preserved with acid (ARUP lists hydrochloric acid), so use the container your lab gives you.
A random or first-morning midstream sample. KDIGO prefers a first-morning sample when checking for kidney protein loss and accepts a random sample if none is available. Shows the sample you gave. It can change from day to day with hydration, activity and illness.
When to talk to a clinician
Contact a clinician if you notice swelling in your hands, feet or around the eyes, foamy or bloody urine, or lasting changes in how often you pass urine, whatever this number says. If you are pregnant, tell your prenatal care team about any protein in your urine.
Questions you could ask
- How does this result fit with my kidney blood tests and my blood pressure?
- Should we repeat this test, maybe on a first-morning sample?
- Would a protein-to-creatinine or albumin-to-creatinine ratio tell us more?
- Could anything I did recently, such as hard exercise, an infection or my period, explain this?
Questions people ask
Why does my clinician also want a ratio to creatinine?
A single urine sample can be watery or concentrated, which pushes the protein number down or up. Dividing by urine creatinine corrects for that, so the ratio is steadier from one sample to the next.
Is a result above 14 mg/dL always a problem?
No. The cut-off differs by lab, and everyday things like a concentrated sample, a hard workout or an infection can raise it. A repeat test, often on a first-morning sample, is the usual next step.
How is this different from the protein on a urine dipstick?
A dipstick gives a quick color-based estimate in steps such as negative, trace and 1+. This test measures an actual amount in the lab.
Show the science and sources
Units
- 1 mg/dL = 1 mg/dL
- 1 mg/dL = 10 mg/L
- 1 mg/dL = 0.01 g/L
Open the Urine Total Protein unit converter
For clinicians and researchers
Random urine total protein is a concentration, so it depends on urine flow and hydration. KDIGO 2024 notes that total protein measurement in urine is imprecise and insensitive at low concentrations, that most labs use turbidimetry or colorimetry (which react more strongly with albumin than with globulins and have interferences), and that there is no reference measurement procedure or standardized reference material, so between-laboratory variation is real. KDIGO therefore favors albumin-to-creatinine or protein-to-creatinine ratios, preferably on a first-morning void, over concentrations alone, and it lists hematuria, menstruation, exercise and infection as causes of falsely high results. ARUP reports a per-volume result "by report" with instrument-specific intervals and states its total protein method underestimates light chains. 24-hour reference values quoted elsewhere are different quantities: MedlinePlus lists 30–150 mg per 24 hours and ARUP 40–150 mg/d. Mayo's random total protein (PRCON, LOINC 2888-6) is non-orderable on its own and has no established range. The LOINC mass-concentration code 2888-6 is the one Mayo uses for this result.
LOINC 2888-6 (primary), 35663-4. Specimen: urine.
Sources
- Urine protein dipstick test, MedlinePlus Medical Encyclopedia (NIH National Library of Medicine)
- Protein in Urine, MedlinePlus Medical Test (NIH National Library of Medicine)
- KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease, Kidney International Supplements (2024)
- Protein, Total, Urine (test 0020479), ARUP Laboratories
- PRCON - Protein, Total, Random, Urine (Non-Orderable), Mayo Clinic Laboratories (via the testcatalog.org mirror)
AI-drafted. Awaiting verification. Last reviewed 2026-10-03. How we build and check these pages.