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

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Match each of the following Gram stain items/actions to the appropriate statement.

Select the correct match for each item from the drop-down box

Can cause gram-negative organisms to stain blue to purple, leading to an erroneous gram-positive result
The preferred preparation for a Gram stain
Should stain pink to red, like gram-negative rods
Can cause gram-positive organisms to stain pink to red, leading to an erroneous gram-negative result
Reactivity verified with every new batch of stain and at least weekly against known gram-positive and gram-negative control organisms
Should stain blue to dark purple, like gram-positive cocci