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Feces gram stain
Definition
Gram stain is a method of identifying microorganisms (bacteria) using a special series of stains. In this test, a specimen of stool is stained and then examined under the microscope.
The gram stain method can be applied to almost any clinical specimen and is one of the most commonly used techniques for the rapid diagnosis of bacterial infections.
Alternative Names
Gram stain of stool; Feces gram stain
Why the Feces gram stain is Performed
The test may be performed to try to diagnose an infection or illness, sometimes involving diarrhea.
How the Feces gram stain is Performed
A small amount of stool is applied in a very thin layer to a microscope slide. This is called a smear. A series of stains called a gram stain is applied to the specimen. It is first stained with crystal violet stain, then iodine, then decolorized, then stained with safranin.
The stained smear is then examined under the microscope for the presence of bacteria. The color, size, and morphologic appearance (shape) of the cells help identify the infecting organism.
How to Prepare for the Feces gram stain
For adults and children:
There are many ways to collect the samples. 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, put the sample in a clean container. One test kit supplies a special toilet tissue that you use to collect the sample, then put the sample in a clean container.
For infants and young children in diapers:
Line the diaper with plastic wrap. If the plastic wrap is positioned properly, isolating the stool from any urine output, mixing of urine and stool can be prevented for a better sample.
How the Feces gram stain Will Feel
Some people feel discomfort or embarrassment with this test.
Risks
There are no risks.
Considerations
Additional examinations of the specimen may be indicated for conditions other than infection.
Normal Results
The presence of only normal or "friendly" organisms is normal. All humans have bacteria in their intestines.
What Abnormal Results Mean
An intestinal infection may be present. Stool cultures and more sophisticated tests can also help diagnose the cause of the infection.
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