Gram stain
Test	Gram stain
Indication	Gram stain is a differential stain used to demonstrate the staining properties of bacteria
Physiology	Gram positive bacteria retain crystal violet dye after decolorization and appear deep blue. Gram negative bacteria are not capable of retaining the crystal violet dye after decolorization and are counterstained red by safranin dye.
Normal Range	Gram Positive/Gram negative
Interpretation	Gram stains is also done to detectt the presence or absence of white blood cells and squamous epithelial cells. Gram stain is the most valuable diagnostic test in bacterial meningitis.
Sample	Bacterial culture
Test Method	Gram staining
Related Tests	Fungus smear, Acid fast stain
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