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Urinalysis and Body Fluids Flashcards

6 cards from real ASCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Normal CSF glucose is approximately what percentage of simultaneous serum glucose?

    Answer: 60–70%

    Normal CSF glucose is 60–70% of serum glucose; values below 45 mg/dL or <50% of serum suggest bacterial meningitis or other pathology.

  2. Red blood cells in CSF that do NOT lyse (xanthochromia present) after centrifugation indicate:

    Answer: Subarachnoid hemorrhage

    Xanthochromia (yellow CSF supernatant) from oxyhemoglobin and bilirubin indicates subarachnoid hemorrhage, not a traumatic tap.

  3. A pleural fluid LDH >200 IU/L and pleural/serum LDH ratio >0.6 classifies the fluid as:

    Answer: Exudate

    Light's criteria classify pleural fluid as an exudate if LDH >200, LDH ratio >0.6, or protein ratio >0.5, indicating inflammation or malignancy.

  4. Which crystal found in joint fluid under polarized light appears yellow when parallel to the compensator and is seen in gout?

    Answer: Monosodium urate crystals (strongly negative birefringence)

    Monosodium urate crystals are strongly negatively birefringent, appearing yellow when parallel and blue when perpendicular to the slow vibration axis.

  5. Semen analysis showing <10 million motile sperm per mL is classified as:

    Answer: Oligospermia with asthenospermia

    WHO criteria define oligospermia as <16 million sperm/mL; combined low count and reduced motility (asthenospermia) are common in male factor infertility.

  6. A peritoneal fluid with >250 PMN cells/µL is diagnostic of:

    Answer: Spontaneous bacterial peritonitis (SBP)

    A PMN count ≥250 cells/µL in ascitic fluid meets diagnostic criteria for spontaneous bacterial peritonitis requiring empiric antibiotic treatment.