A sputum Gram stain is a laboratory test used to detect bacteria in a sputum sample. Sputum is the material that comes up from your air passages when you cough very deeply.
The Gram stain method is one of the most commonly used methods to rapidly detect a bacterial infection, including pneumonia.
Your doctor may order this test if you have a persistent or prolonged cough, or if you are coughing up material that has a foul odor or unusual color. The test may also be done if you have other signs and symptoms of respiratory disease or infection.
A normal result means that few to no white blood cells and no bacteria were seen in the sample. The sputum is clear, thin, and odorless.
You may be instructed to rinse your mouth out with water prior to collection.
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