What is Urea?
kidney function and hydration
Urea is formed in the liver from protein breakdown and is excreted by the kidneys. The value is affected by protein intake, hydration, and kidney function.
Urea is less specific than creatinine for kidney function but gives clues about hydration and protein intake.
Test facts
- Unit
- mmol/L
- Sample
- Serum
- Fasting
- No fasting needed
- Turnaround
- 1 day
What does low Urea mean?
Low urea can appear with low protein intake or liver disease.
What does high Urea mean?
High urea can reflect reduced kidney function, dehydration, or high protein intake.
Panels that measure Urea
- Kidney Check
More markers in the same area
Launching in Stockholm in 2026.
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This is general information about the marker, not an assessment of your values and not medical advice. Last updated: May 2026.