Lab marker · Low

Low Urea: what it means

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

Reference range: ~2.5–7.8 mmol/L (reported as BUN in mg/dL in the US); reflects kidney function, hydration and protein — read with creatinine

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What a low Urea can mean

  • Low-protein diet or malnutrition.
  • Liver disease — the liver makes less urea.
  • Over-hydration — dilutional.
  • Pregnancy — a normal lower level.

When to discuss with a doctor

Urea is read together with creatinine and eGFR, not alone, because on its own it cannot separate a kidney problem from dehydration or diet. A raised urea with a normal creatinine most often points to dehydration and improves with fluids. A raised urea with a raised creatinine and a low eGFR points to reduced kidney function needing assessment. A disproportionately high urea can also be a clue to a gastrointestinal bleed when there are other signs. Mediora.AI shows urea alongside creatinine, eGFR and sodium so the pattern — kidney versus hydration — is visible, and reconciles the urea/BUN naming; the clinical interpretation belongs with your doctor.

Conditions this can relate to

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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.