The Urea Test Strip use a timed-endpoint method to measure the Urea (UR) concentrations in
whole blood, serum or plasma. The system monitors the change in absorbance at 620 nm at a
fixed-time interval. The change in absorbance is directly proportional to the concentration
of metabolite in the specimen.UR: Urea in the specimen are hydrolyzed to NH3 and CO2 by the action of urease，and an indicator layer containing an indicator which produces a detectable change by gaseous ammonia.
Reference values are listed in the chart below:
Tests
Desirable
Urea (UR)
1.70~8.30mmol/L（10.21~49.85mg/dL）


Reference ranges may vary between laboratories. Every laboratory should establish its own
reference range as needed.
UR levels will have big physiological fluctuations depending on food consumed or exercise.