A blood specimen could not be focused on oil immersion although it could be focused on both ´10 and ´40. What is the most likely cause?
a. The pH of the stain is too acidic.
b. The specimen is too thick.
c. Something is wrong with the oil lens.
d. The specimen is probably upside down.
ANS: D
If the specimen can be seen under both ´10 and ´40 but not under ´100, it most likely is upside down on the stage.
Health Professions
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