COVID-19: Vaccines, boosters, testing, and visitor guidelines. Please use ER for emergencies only. As significantly higher COVID surge looms, we ask for your help in preventing spread of the disease.

Gram stain

A Gram stain is a type of test that helps tell whether bacteria causing an infection are Gram-positive or Gram-negative. This can help a doctor choose the best treatment for an infection.

The Gram stain is done by putting a special dye on the bacterial cells. Gram-positive bacteria retain the dye and turn a different color than Gram-negative bacteria do. Sometimes more testing is done after the Gram stain to identify the specific kind of bacteria and the antibiotics that can kill them.

 
 

PeaceHealth endeavors to provide comprehensive health care information, however some topics in this database describe services and procedures not offered by our providers or within our facilities.