What is MDR-TB?
(Part 9)
The Bohol Tribune (TBT): You have made mention of a TB skin test, Dr. Bryan. How is this performed?
Dr. Bryan Cepedoza: The TB skin test is performed through an injection. This injection is done with the use of a 0.1 ml of tuberculin purified protein derivative (PPD) into the inner surface of the forearm. The injection should be made with a disposable 27-gauge tuberculin syringe, with the needle bevel facing upward. The TB skin test is an intradermal injection.
The Bohol Tribune (TBT): And how is TB diagnosed through a skin test?
Dr. Bryan Cepedoza: A tiny amount of a substance called tuberculin is injected just below the skin on the inside of one forearm. Within 48 to 72 hours, a health care worker will check your arm for swelling at the injection site. The size of the raised skin is used to determine a positive or negative test.
The Bohol Tribune (TBT): How do we know if the skin test is positive?
Dr. Bryan Cepedoza: The test is “positive” if there is a bump of a certain size where the fluid was injected. This means you probably have TB germs in your body. Most people with a positive TB skin test have latent TB infection. To be sure, your doctor will examine you and give you a chest x-ray.
The Bohol Tribune (TBT): How should one react to a TB test?
Dr. Bryan Cepedoza: You CAN bathe and swim but AVOID applying sun lotion to the site of your test. Some people experience some redness, rash, slight bruisin or a small bump at the site. DO not WORRY! These reactions are common and do not necessarily mean you have a positive test.
The Bohol Tribune (TBT): Does TB skin test hurt?
Dr. Bryan Cepedoza: For a TB skin test, you may feel a pinch when the fluid is placed under your skin. For a blood test, you may have slight pain or bruising at the spot where the needle was put in, but most symptoms go away quickly.
The Bohol Tribune (TBT): How does a person prepare himself for a TB skin test?
Dr. Bryan Cepedoza: In general, there’s nothing you have to do before this test, unless your healthcare provider asks you to.