Two 0.9 mL aliquots of a serum are placed in two separate test tubes. These two test tubes are labeled as A and B. To tube-A, 0.1 mL of water is added. To tube-B, 0.1 mL of 200 mg/dL urea is added. Both specimens (A ad B) are analyzed for their urea concentration, and obtained following results. Tube-A= 24 mg/dL Tube-B= 43 mg/dL What is the percent recovery of this experiment? 75% 95% 58% 90%
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