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

Exercise 82

Reagent strip–specific gravity readings are affected by:

A. Glucose

B. Radiographic dye

C. Alkaline urine

D. All of the above

Step 1 of 3

Specific gravity reaction interference:

The reading of specific gravity is affected by alkaline urine (pH above 6.5) which gives false-negative results.

• The specific gravity readings should be increased (1.000-1.030) in reagent strip; it is increased with the help of acidic urine (below 6.0).

• Alkaline pH above 6.5 will decrease the specific gravity readings.

• This interference is caused by bromthymol blue indicator used in reagent strip reaction for specific gravity.