Medical Laboratory Technician Exam Medical Laboratory Technician Urinalysis and Body Fluids Questions and Answers 3

Question 1

Which crystal found in acidic urine appears as a hexagonal flat plate and is associated with an inherited metabolic disorder?

Accepted Answer

Cystine

Answer

Cystine crystals appear as colorless hexagonal plates in acidic urine and indicate cystinuria, an inherited amino acid transport disorder.

Question 2

In a manual cell count of cerebrospinal fluid, the total WBC count is performed using which diluent?

Accepted Answer

Acetic acid with methylene blue

Answer

Dilute acetic acid lyses RBCs while methylene blue stains WBC nuclei, allowing accurate CSF white cell counting.

Question 3

A urine specimen that turns dark brown-black upon standing most likely contains which substance?

Accepted Answer

Homogentisic acid

Answer

Homogentisic acid in alkaptonuria oxidizes upon exposure to air, causing urine to turn dark brown to black.

Question 4

What is the clinical significance of finding oval fat bodies in a urine sediment?

Accepted Answer

Nephrotic syndrome with lipiduria

Answer

Oval fat bodies are renal tubular epithelial cells that have absorbed lipids, characteristic of nephrotic syndrome with significant proteinuria.

Question 5

Which body fluid analysis finding is most characteristic of a traumatic lumbar puncture rather than a subarachnoid hemorrhage?

Accepted Answer

Decreasing RBC count in successive collection tubes

Answer

A traumatic tap shows progressively decreasing RBC counts from tube 1 to tube 3, while subarachnoid hemorrhage shows uniform counts.

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