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50
10. Measurements with the Microscope
• Move the orientation handle to its extreme
right position; now the aligned crystals should
be blue, and perpendicular yellow (fig. 52)
• Be sure to test crystals with the orientation
handle in each position to insure positive
identification
Fig. 52 Identification of gout
Fig. 53 Identification of pseudo gout
The following is the procedure for identifi-
cation of pseudo gout:
The test for pseudo gout is done identically to
the test for gout. However, the color change is
opposite that of Gout. That is, with the handle at
the left extreme, aligned crystals are blue and
perpendicular crystals are yellow, and vice
versa with the level at the right side (fig. 53).
Test for Gout
Crystals
yellow
Crystals
blue
Handle
left
Crystals
blue
Crystals
yellow
Handle
right
Test for Pseudo Gout
Crystals
blue
Crystals
yellow
Handle
left
Crystals
yellow
Crystals
blue
Handle
right