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

Exercise 12

The reagent strip reaction that requires the longest reaction time is the:

A. Bilirubin

B. pH

C. Leukocyte esterase

D. Glucose

Step 1 of 2

Reagent strip:

• Reagent strips have pads which are absorbent and made of plastic.

Chemical reaction occurs in reagent strips when the absorbent material in the strip immersed with urine producing different shades of color for specific detection of elements in urine.

• Chemical reaction starts in reagent strips once the strip is immersed and taken out of urine specimen.

• The time of reaction varies from one element to another present in urine.

• Reaction of pH shows immediately.

• Reaction of leukocyte esterase takes much time of 120 seconds.

Therefore, “leukocyte esterase” reaction needs the longest reaction time in reagent strips. Hence, the correct answer is option .