Quick Review Cards for Medical Laboratory Science

Specific Sources of Error with Reagent Strip

Testingcontinued

Urinalysis and Body

Fluids Review 495

INCREASED OR FALSE POSITIVE DECREASED OR FALSE NEGATIVE

Leukocyte esterase

Specific gravity

Sources of error vary with brand of reagent strip. Refer to manufacturer’s package insert.

↑glucose, ↑protein, ↑ascorbic acid, ↑SG; antibiotics;

reading too soon.

Alkaline urine. (Add 0.005 if pH is 6.5 or higher. Correction

is made by automated readers.)

Highly pigmented urine, oxidizing

agents, formalin, nitrofurantoin, vaginal

discharge

↑protein