CSMLS CSMLS Urinalysis and Body Fluids 2

Question 1

Glucose in urine (glucosuria) typically appears when blood glucose exceeds the renal threshold of approximately:

Accepted Answer

10 mmol/L

Answer

Glucosuria occurs when blood glucose exceeds approximately 10 mmol/L (180 mg/dL), saturating the tubular reabsorption capacity.

Question 2

In cerebrospinal fluid (CSF) analysis, xanthochromia (yellow discoloration) indicates:

Accepted Answer

Previous subarachnoid hemorrhage

Answer

Xanthochromia results from oxyhemoglobin and bilirubin released by lysed red blood cells after subarachnoid hemorrhage.

Question 3

Normal CSF total protein is approximately:

Accepted Answer

0.15–0.45 g/L

Answer

Normal CSF total protein ranges from 0.15 to 0.45 g/L, which is much lower than plasma protein levels due to the blood-brain barrier.

Question 4

Pleural fluid with a protein concentration greater than 30 g/L is classified as:

Accepted Answer

Exudate

Answer

Exudates have protein greater than 30 g/L (or LDH-based Light's criteria), indicating inflammation, infection, or malignancy as the cause.

Question 5

Synovial fluid from a patient with gout would typically show:

Accepted Answer

Negatively birefringent needle-shaped crystals under polarized light

Answer

Gout is characterized by negatively birefringent, needle-shaped monosodium urate crystals identified under compensated polarized light microscopy.

CSMLS - Canadian Society for Medical Laboratory Science Practice Test