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Lepromin skin test   

Overview | Risks | Results

Alternative names:

Leprosy skin test

Definition:

A test to determine what type of leprosy a person has. It involves the injection of a standardized extract of inactivated leprosy-causing bacteria under the skin.

How the Test is Performed

An extract sample of inactivated leprosy-causing bacteria is injected just under the skin, usually on the forearm, so that a small lump pushes the skin up. The lump indicates that the antigen has been injected at the correct depth. The site is labeled and is examined (at 3 days and at 28 days to see if there is a reaction induration) at the site of the injection.

How to Prepare for the Test

People with dermatitis or other skin irritations should have the test performed on a part of the body which is not affected.

If your child needs to have this test performed, it may be helpful to explain how the test will feel, and even practice or demonstrate on a doll. The more familiar your child is with what will happen and why, the less anxiety he or she will feel.

How the Test will Feel

When the antigen is injected, there may be a slight stinging or burning sensation. There may also be mild itching at the site of injection afterwards.

Why the Test is Performed

Leprosy is a chronic and potentially disfiguring infection if left untreated, caused by a bacteria called Mycobacterium leprae. This test is a research tool which helps classify the different types of leprosy. It is not recommended as a primary mode of diagnosis.

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