Rectal culture

Definition

Rectal culture is a laboratory test to identify organisms in the rectum that can cause gastrointestinal symptoms and disease.

Alternative Names

Why the Test is Performed

The test is performed if you have gastrointestinal distress and your doctor suspects that an infection is the cause. It may be done when gonorrhea is suspected. It may also be done as an alternative to a fecal culture if it is not possible to get a feces specimen.

The rectal culture may also be performed in a hospital or nursing home setting to see if someone carries vancomycin-resistant enterococcus (VRE) in their intestine, which can be spread to other patients.

How the Test is Performed

A cotton swab is inserted into the rectum, rotated gently, and removed. A smear of the swab is placed in culture media to encourage the growth of bacteria and other organisms. The laboratory technician watches the culture for growth.

When growth is observed, the organisms can be identified. Further tests to determine how the organisms will respond to treatment may also be done.

See also: Sensitivity analysis

How to Prepare for the Test

The health care provider does the rectal examination.

How the Test Will Feel

There may be pressure as the swab is inserted into the rectum, but the test is usually not painful.

Risks

There are no risks.

Normal Results

The presence of organisms that are usually found in the body is normal.

What Abnormal Results Mean

Abnormal results may indicate an infection, such as bacterial or parasitic enterocolitis or gonorrhea. Sometimes culture shows that the patient is a carrier, but does not necessarily have an infection.

See also: Proctitis