A Crystal with Long, Thin, Needlelike, Pointed Ends Is Identified

question 5

Multiple Choice

A crystal with long, thin, needlelike, pointed ends is identified in synovial fluid. The crystals are located inside and outside the cells. A quartz compensator is used, and it determines that the crystals are negatively birefringent and are a yellow color when parallel to the axis of the compensator. The crystal is blue when turned perpendicular to the axis of the compensator. What is the type of crystal?

• A) Monosodium urate
• B) Calcium pyrophosphate
• C) Cholesterol crystals
• D) Pseudogout