Stool Gram stain

Gram stain of stool; Feces Gram stain

A stool Gram stain is a laboratory test that uses different chemical stains to detect and identify bacteria in a stool sample.

The Gram stain method is sometimes used to quickly diagnose bacterial infections.

How the Test is Performed

You will need to collect a stool sample.

There are many ways to collect the sample.

You can catch the stool on plastic wrap that is loosely placed over the toilet bowl and held in place by the toilet seat. Then you put the sample in a clean container.
A test kit is available that supplies a special toilet tissue that you use to collect the sample. After collecting the sample, you put it in a container.
Do not take stool samples from the water in the toilet bowl. Doing this can cause an inaccurate test result.

Do not mix urine, water, or toilet tissue with the sample.

For children wearing diapers:

Line the diaper with plastic wrap.
Position the plastic wrap so that it will prevent urine and stool from mixing. This will provide a better sample.

Your health care provider will give you instructions on when and how to return the sample.

The sample is sent to a laboratory. A small amount is spread in a very thin layer on a glass slide. This is called a smear. A series of special stains are added to the sample. The lab team member looks at the stained smear under the microscope to check for bacteria. The color, size, and shape of the cells help identify the specific bacteria.

How the Test will Feel

A lab smear is painless and does not directly involve the person who is being tested.

There is no discomfort when a stool sample is collected at home because it only involves normal bowel functions.

Why the Test is Performed

Your provider may order this test to help diagnose an intestinal infection or illness, sometimes involving diarrhea.

Normal Results

A normal result means only normal or "friendly" bacteria were seen on the stained slide. Everyone has "friendly" bacteria in their intestines.

Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.

What Abnormal Results Mean

An abnormal result means that an intestinal infection may be present. Stool cultures and other tests can also help diagnose the cause of the infection.

Risks

There are no risks.

Open References

References

Allos BM. Campylobacter infections. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 279.

Allos BM, Blaser MJ, Iovine NM, Kirkpatrick BD. Campylobacter jejuni and related species. In: Bennett JE, Dolin R, Blaser MJ, eds. Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 216.

Plourde AR, Beavis KG. Specimen collection and handling for diagnosis of infectious diseases. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 66.

Gram stain - illustration
A Gram stain is a test used to help identify bacteria. The tested sample can be taken from body fluids that do not normally contain bacteria, such as blood, urine, or cerebrospinal fluid. A sample can also be taken from the site of a suspected infection, such as the throat, lungs, genitals, or skin. Bacteria are classified as either Gram-positive or Gram-negative, based on how they color in reaction with the Gram stain. The Gram stain is colored purple. When combined with the bacteria in a sample, the stain will either stay purple inside the bacteria (Gram-positive), or it will turn pink (Gram-negative). Examples of Gram-positive bacteria include Streptococcus and Staphylococcus aureus, as well as bacteria that cause anthrax, diphtheria, and toxic shock syndrome. Examples of Gram-negative bacteria include Escherichia coli (E coli), Salmonella, Hemophilus influenzae, as well as many bacteria that cause urinary tract infections, pneumonia, or peritonitis. Gram stain can be done within a few hours. The results help providers choose the first antibiotics to use. Cultures of bacteria help identify specific bacteria, but take days to complete.
Gram stain
illustration

A Closer Look

Self Care

Tests for Stool Gram stain

Review Date: 10/11/2024

Health Content Provider

06/01/2025

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