Urinalysis and Body Fluids 6th Edition by Majorie DiLorenzo, Susan Strasinger

Exercise 6

An unidentified fluid is received in the laboratory with a request to determine whether the fluid is urine or another body fluid. Using routine laboratory tests, what tests would determine that the fluid is most probably urine?

A. Glucose and ketones

B. Urea and creatinine

C. Uric acid and amino acids

D. Protein and amino acids

Step 1 of 2

Urea:

• Urea is the organic substance found in urine.

Creatinine:

• Creatinine obtained from muscle metabolism and it is a waste product of it.

• Kidneys filter the blood and send creatinine out through urine. So, normal urine contains both urine and creatinine.

In the laboratory specific fluids are tested with some specific acid to detect the suspected fluid.

• Likewise, the unknown fluid or sample is tested with creatinine and urea to identify whether it is urine is not.

Therefore, “creatinine and urea” test is used to determine whether the given unknown fluid is urine. Hence, the correct answer is option.