Comparison of Polarized Light Microscopic Findings of Synovial Fluid from a Joint with Gout and a Joint with Pseudogout

Comparison of Polarized Light Microscopic Findings of Synovial Fluid from a Joint with Gout and a Joint with Pseudogout.

GoutPseudogout
CrystalUrateCalcium pyrophosphate dehydrate
ShapeNeedleRhomboid or rectangular
BirefringenceNegativePositive
Color of crystals parallel to axis of red-plate compensatorYellowBlue

Pearl: For the crystal color, use the mnemonic ABC (alignment, blue, calcium). If the crystal aligned with the red-plate compensator is blue, it is CPPD. Urate crystals are the opposite, being yellow when parallel to the compensator. Crystals within WBCs are more indicative of a crystalline arthropathy than free-floating crystals. Note that hydroxyapatite crystals are too small to see with polarized light 

15585

Sign up to receive the trending updates and tons of Health Tips

Join SeekhealthZ and never miss the latest health information

15856
Scroll to Top