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Protein / Creatinine Ratio, Random Urine

Urine Protein/Creatinine Ratio

This ratio estimates 24-hour protein excretion from a single urine sample, avoiding the inconvenience of a full-day collection. It is widely used to quantify kidney protein loss.

URINE24 HOURSNO FASTING
AEDAED170
  • Free home collection
  • Physician-reviewed report

24 Hours

Turnaround

Urine

Sample

About This Test

What the Protein / Creatinine Ratio, Random Urine test tells you

This test measures the total protein in a single urine sample and divides it by the creatinine in that same sample. Creatinine is produced by muscle at a fairly steady rate and passes into the urine continuously, so it acts as a marker of how concentrated the sample happens to be. Expressing protein against creatinine strips out most of the variation caused by drinking, sweating and the time of day, which is what makes an untimed sample reliable.

The reason this matters is practical. Quantifying protein loss traditionally meant collecting every drop of urine over a full day, which is inconvenient, easy to get wrong and frequently incomplete, and an incomplete collection produces a wrong answer that nobody can detect afterwards. The ratio from one sample tracks the full-day figure closely enough for most clinical decisions, so it has largely replaced timed collections for routine assessment and monitoring, including in pregnancy where suspected pre-eclampsia needs a prompt answer.

Total protein is a broader measure than albumin alone. It captures albumin plus the smaller proteins that appear when the kidney tubules are affected, and the abnormal light-chain proteins produced in some bone-marrow disorders, so it catches protein types an albumin-only test can miss. Rising ratios over time suggest kidney disease is progressing, while falling ones suggest treatment is working. Your doctor reads the trend alongside blood tests of kidney function, blood pressure and, where relevant, a urine albumin measurement, rather than reacting to any single value.

Sample type
Urine
Measured in
mg/g
Turnaround
24 Hours
Fasting
Not required
Best for
All ages
Why Get Tested?

Convenient alternative to 24-hour urine collection for quantifying proteinuria. Used for monitoring nephropathy, pre-eclampsia, and chronic kidney disease.

  • Replaces timed collections

    One sample gives a figure close to a full day's protein loss without the errors that come with all-day collections.

  • Quantifies kidney protein loss

    It turns a dipstick's rough positive into a measured value that can be tracked from visit to visit.

  • Catches non-albumin protein

    Unlike an albumin-specific test, it detects tubular and abnormal proteins that would otherwise be missed.

  • Assesses pregnancy hypertension

    When raised blood pressure appears in pregnancy, the ratio gives a prompt measure of protein loss.

When This Test Is Ordered

Reasons your doctor may request the Protein / Creatinine Ratio, Random Urine test

Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.

  • Quantifying protein found on a dipstick

    • A urine dipstick has shown protein and your doctor wants it quantified.
    • Swelling of the legs, face or around the eyes is being investigated.

  • Raised blood pressure in pregnancy

    • Raised blood pressure has developed in pregnancy and protein loss must be assessed quickly.

  • Kidney disease, treatment & systemic conditions

    • You are being monitored for chronic kidney disease and need comparable results over time.
    • Treatment for a kidney condition has started or changed and its effect needs measuring.
    • A systemic condition such as lupus or diabetes is being followed for kidney involvement.
Preparation
The short version
No prep needed.
  • Urine
  • Free home collection
  • No fasting
  • Results in 24 Hours
  1. 1
    Book any time

    No fasting window: pick any slot that suits you, online or on WhatsApp.

  2. 2
    We come to you

    A DHA-licensed nurse collects your sample at home or in the office: free home collection.

  3. 3
    Results in 24 Hours

    A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.

Prep note
Physician reviewed

No fasting is needed.

A first-morning sample is preferred, because overnight urine is the most reproducible and avoids the protein some healthy people pass simply from being upright during the day. Collect a clean midstream sample: pass the first part of the stream into the toilet, then fill the container without touching the inside.

Avoid strenuous exercise the day before, drink as you normally would rather than deliberately more, and postpone the test during a urinary infection, a fever or menstruation. Tell your doctor about blood-pressure medication, anti-inflammatory painkillers and any supplements, and get the sample to the laboratory promptly.

Understanding Your Results

A ratio in the Normal band, 0 to 149 mg/g, means only a trace of protein is leaving in your urine, and carries no further meaning of its own. A High ratio, 150 to 3000 mg/g, indicates protein is being lost: from leaking filtering units, diabetic kidney disease, a tubular disorder, an abnormal protein made in the bone marrow, or a hypertensive disorder of pregnancy such as pre-eclampsia. Not every raised ratio reflects kidney disease. A urinary tract infection, a fever or heavy exertion around the time of sampling can lift it temporarily, which is why a single result is usually repeated. Dividing by creatinine assumes an average rate of creatinine production, so a very muscular or a very frail person shifts the ratio in opposite directions. It shows that protein is lost, not which protein or from where. Your doctor reads the trend with your kidney function, blood pressure and symptoms.

SmartReport
150
Healthy zone75mg/gNormal
Reference ranges · mg/g
Normal
Normal: minimal protein loss.
0–149
High
Elevated: may indicate kidney involvement.
150–3000

Ranges are a guide: your physician interprets your result alongside your symptoms and history.

Reading a High or Low Result

  • What a higher result can point to

    • Glomerular disease, where the kidney's filtering units leak protein.
    • Diabetic kidney disease that has progressed beyond its earliest stage.
    • Pre-eclampsia and other hypertensive disorders of pregnancy.
    • Tubular disorders in which small proteins are no longer reabsorbed.
    • Overproduction of abnormal proteins in a bone-marrow disorder.
    • A urinary tract infection, fever or heavy exertion around the time of sampling.

These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.

Limitations & Safety

What this test cannot tell you

  • The ratio assumes an average rate of creatinine production, so very muscular or very frail people shift it in opposite directions.
  • It estimates a full day's loss rather than measuring it, and a definitive answer sometimes still needs a timed collection.
  • It shows that protein is being lost but not which protein or from where, which requires further testing.
  • A low ratio carries no meaning beyond the absence of significant protein loss.

Risks of the blood draw

  • Mild bruising or brief soreness where the needle went in.
  • Occasional lightheadedness, which settles after a few minutes of rest.
  • Bleeding or infection at the site, which is rare with sterile single-use equipment.
Key Points
  • 1Dividing protein by creatinine corrects for how dilute or concentrated the sample was.
  • 2That correction is what allows one untimed sample to stand in for a full-day collection.
  • 3Total protein covers more than albumin alone, including tubular and abnormal proteins.
  • 4The trend across several results is more informative than any single value.
  • 5Muscle mass affects the ratio, so results are interpreted against the individual.
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Frequently Asked Questions

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Full-day collections are frequently incomplete, and a missed sample makes the result wrong in a way nobody can detect afterwards. The ratio from a single sample avoids that and agrees closely enough for most decisions.