Lab marker · Low

Low 24-hour urine protein: what it means

A 24-hour urine protein result below the normal range is considered low. Here is what a reduced 24-hour urine protein can point to, and when it is worth discussing with a doctor.

Reference range: <150 mg/24h normal; measured on a full-day urine collection to quantify protein leaking through the kidneys — >3.5 g/24h is 'nephrotic range'

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What a low 24-hour urine protein can mean

  • Normal (<150 mg/24h) — the expected result; the kidney filters are holding protein back.
  • A falling level on treatment — suggests the kidney condition or its cause is responding.

When to discuss with a doctor

A 24-hour urine protein test is used to measure precisely how much protein the kidneys are losing, most often after a dipstick or spot ratio has already flagged protein in the urine, and to monitor a known kidney condition over time. It matters because the amount of protein loss is both a marker of kidney damage and a predictor of how the kidneys will fare — and a very heavy (nephrotic-range) loss defines a syndrome that needs specific care. A full-day collection must be done correctly (all urine over 24 hours) for the result to be accurate, which is why the simpler spot ratio is often used instead. Mediora.AI shows the 24-hour protein alongside the spot ratios, albumin and kidney function so the proteinuria picture is read together; the interpretation belongs with your doctor.

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.