To differentiate a bacterial cast from a granular cast,a clinical laboratory scientist could:
A) Perform a Gram stain
B) Use polarizing microscopy
C) Perform a Hansel stain
D) Add acetic acid to the sediment

Question

Quizplus · Accepted Answer

Performing a Gram stain is the best choice as it will allow the clinical laboratory scientist to differentiate between a bacterial cast (which will appear purple/blue under the microscope) and a granular cast (which may have various colors but will not show the characteristic bacterial shape and arrangement). Polarizing microscopy and the Hansel stain are not relevant to identifying casts, while adding acetic acid to the sediment may be useful for dissolving red blood cells but will not aid in identifying bacterial casts.

To Differentiate a Bacterial Cast from a Granular Cast,a Clinical