Urea - plasma or serum
Last updated: Wednesday, 31, March, 2004
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5 mL blood in lithium heparin or plain tube.
| Reference Interval|
Neonate: 1.0-4.0 mmol/L
Investigation of renal function.
Increased levels are seen with reduced glomerular filtration due to renal or pre-renal disease; bleeding into the gastrointestinal tract; hypercatabolic states.
Reduced values are seen in pregnancy; with water retention; with reduced synthesis as a result of decreased protein intake, severe liver disease, or urea-cycle defects.
Dossetor JB. Ann Int Med 1966; 65: 1287-1299.