Histoplasma skin test
.Histoplasma Skin Test
A Histoplasma skin test is a type of test used to check for exposure to the fungus Histoplasma capsulatum. The fungus is a very common airborne organism found in soil and bird droppings, mainly in the humid regions of North and Central America, East and South East Asia, Africa, and Australia-New Zealand.
Why do I need a Histoplasma Skin Test?
The Histoplasma skin test may be recommended if you are at risk of a Histoplasma capsulatum infection. People at risk include those who work in areas where fungi such as Histoplasma capsulatum are found, those who travel or live in regions where the fungus is common, and those with weakened immune systems. It is also a method commonly used to screen for latent infection.
Preparation for the Test
No preparation is required for the Histoplasma skin test, although it is recommended that the test is done in the early morning. For those who take medication or have any health conditions, it is important to consult your healthcare provider before taking the test.
Procedure
The Histoplasma skin test is usually done by a healthcare professional. The procedure begins by referring to your medical history and asking about any exposure to Histoplasma capsulatum. Scraping or a small injection of antigen is done on the left forearm of the patient. The skin is then lightly scratched with a needle and the antigen is injected with a small amount of fluid. The healthcare provider will then observe the area for 2-3 hours. If the test is positive, a red hive will appear in the area.
Types of Tests
There are two main types of tests for Histoplasma capsulatum, the first being the Histoplasma skin test and the second is the Histoplasma IgM and IgG Antibody blood test. The Histoplasma skin test is the faster and cheaper out of the two tests as it only takes a few hours for the results to come out. The Histoplasma IgM and IgG Antibody blood test takes a few days and is generally more expensive.
Risks and Complications
The Histoplasma skin test is generally safe and does not have any major side effects. There is a chance that you may experience redness, itching or irritation after the test. However, these side effects are usually minor and can be treated with over the counter medication. In rare cases, the test can also cause an allergic reaction. If you experience any breathing problems or hives after the test, contact your healthcare provider immediately.
When to Take the Test?
The Histoplasma skin test should be taken when you are at risk of a Histoplasma capsulatum infection. This test should be done early in the morning, as early morning is the best time to get accurate results. It is also recommended that the test is done every year, if you are at risk and in contact with the fungus.