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Mycobacterial culture

Mycobacterial culture is a test to look for the bacteria that cause tuberculosis and similar infections.

Alternative Names

Culture - mycobacterial

How the Test is Performed

A sample of body fluid or tissue is needed. This sample may be taken from the lungs, liver, or bone marrow.

Most often, a sputum sample will be taken . To obtain a sample, you will be asked to cough deeply and spit out the material that comes up from your lungs.

A biopsy or aspiration may also be done.

The sample is sent to a laboratory. There it is placed in a special dish (culture). It is then watched to see if the bacteria grow.

How to Prepare for the Test

Preparation depends on how the test is done. Follow your health care provider's instructions.

How the Test will Feel

How the test will feel depends on the specific procedure. Your health care provider can discuss this with you before the test.

Why the Test is Performed

Your doctor may order this test if you have signs of tuberculosis or a related infection.

Normal Results

If there is no disease present, there will be no growth of bacteria in the culture medium.

What Abnormal Results Mean

Mycobacterium tuberculosis or similar bacteria is present in the culture.

Risks

Risks depend on the specific biopsy or aspiration being performed.

References

Ellner JJ. Tuberculosis. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 24th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 332.

Hall GS, Woods GL. Medical bacteriology. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 57.

Updated: 11/20/2013

Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.


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