Thick Smears

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The page below is a sample from the LabCE course Reading and Reporting Gram-stained Direct Smears. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

Learn more about Reading and Reporting Gram-stained Direct Smears (online CE course)
Thick Smears

This smear is too thick and too darkly stained. It would be difficult to find appropriate fields for examination in this type of smear. Even if a few fields were located, the Gram reaction might not be interpreted correctly, as almost everything on this thick smear might appear gram positive.