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Laboratory Medicine

Test Directory / Urea


Brown clotted serum, gel barrier or lithium heparin

Common AbbreviationsURE
ProfileUrea and Electrolytes
Tube typeBrown clotted serum, gel barrier or lithium heparin
Clinical IndicationOften measured along with creatinine in the differential diagnosis of renal function. Elevated urea levels may be seen in kidney disease, heart failure, dehydration and following a GI bleed.
Specimen TypeBlood
Sample typeSerum or plasma
Minimum Volume0.5mL If requesting more than 10 tests please send an additional brown clotted serum sample.
Special PrecautionsNo special requirements
Stability7 days at 2-25°C
Turnaround TimeUrgent: 2 hours Inpatient: 4 hours Outpatient/ GP: 24 hours
LaboratoryYork and Scarborough
Reference Interval2.5-7.8 mmol/L (Recommended by the Pathology Harmonisation Reference Group)
LimitationsHighly lipaemic samples may exceed the reaction absorbance and are therefore unsuitable for analysis.
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