CMLA Urinalysis 3

Question 1

Which reagent strip pad detects leukocyte esterase in urine?

Accepted Answer

Esterase enzyme from granulocytes

Answer

Leukocyte esterase pads detect the esterase enzyme released by lysed granulocytes (primarily neutrophils) in urine.

Question 2

Bilirubin in urine produces what characteristic finding when the specimen is shaken?

Accepted Answer

Yellow foam

Answer

Bilirubin in urine produces a yellow foam when shaken, which helps differentiate it from other causes of yellow discoloration.

Question 3

Which condition would cause false-negative glucose results on a urine dipstick?

Accepted Answer

High vitamin C (ascorbic acid) concentration

Answer

High ascorbic acid concentrations interfere with the glucose oxidase reaction, causing false-negative dipstick glucose results.

Question 4

What type of cast is associated with end-stage renal disease or chronic renal failure?

Accepted Answer

Waxy cast

Answer

Waxy casts form from degenerated granular casts in dilated, damaged tubules and are associated with severe chronic renal disease.

Question 5

A first-morning urine specimen is preferred for pregnancy tests because:

Accepted Answer

It has the highest concentration of hCG

Answer

First-morning urine contains the highest concentration of hCG due to overnight accumulation, improving test sensitivity.

(CMLA) Certified Medical Laboratory Assistant Practice Test