Page 256 - Clinical Hematology Atlas

240 SECTION FIVE MISCELLANEOUS

FIGURE 24–31 Monosodium urate crystals
(synovial fluid 31000; unstained). (Courtesy
George Girgis, MT [ASCP], Indiana University
Health.)

A B
FIGURE 24–32 Monosodium urate crystals, polarized light microscopy (A) and with red
compensator (B) (synovial fluid 31000). (Courtesy George Girgis, MT [ASCP], Indiana
University Health.)

Note the orientation of the crystals and corresponding colors. Crystals appear yellow when
parallel to the axis of slow vibration and blue when perpendicular to the axis.