A CSF was collected from a 5-year-old with a fever, and 3 tubes were transported to the lab. Tube 1 had 50,000 RBC/mL and 48 WBC/mL. Tube 3 had 10 RBC/mL and 0 WBC/mL. What is the most likely explanation for the discrepancy?

The formation of renal calculi is enhanced by:

Nitrite in a urine specimen suggest the presence of

Identify the object indicated by the arrow. MEDT A395 Urine Q68.jpg

A sperm count is diluted 1:20 and 50 sperm are counted in two large squares of the Neubauer counting chamber. The sperm count in mL is:

A physician attempts to aspirate a knee joint and obtains 0.1 mL of slightly bloody fluid. Addition of acetic acid results in turbidity and a clot. This indicates that:

Which of the following substances is responsible for the foul, fishy odor obtained during the “whiff” test when testing vaginal secretions.

A technician is having trouble differentiating between red blood cells, oil droplets, and yeast cells on a urine microscopy. Acetic acid should be added to the sediment to:

Which crystal causes pseudogout?

The presence of ketone bodies in urine specimens may be detected by use of a reagent strip impregnated with sodium nitroprusside. This strip test is sensitive to the presence of