Examination of Synovial Fluid Under Direct Polarized Light Reveals Intracellular

question 37

Multiple Choice

Examination of synovial fluid under direct polarized light reveals intracellular needle-shaped crystals that appear white against the black background.When a red compensator is added and the crystals are aligned with the slow vibration,they appear yellow against the red background.These crystals are:

• A) Monosodium urate showing positive birefringence
• B) Monosodium urate showing negative birefringence
• C) Calcium pyrophosphate showing positive birefringence
• D) Calcium pyrophosphate showing negative birefringence

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