Which of the following can cause a falsely increased ESR?
a. Concentration of anticoagulant increased
b. Tube not totally vertical
c. Tuberculosis
d. Increased plasma viscosity
ANS: B
The ESR tube must be kept at the absolute perpendicular to obtain a valid ESR result. Even only a slight tilt of the pipette (tube) causes the ESR to increase.
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Fill in the blank(s) with the appropriate word(s).