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Readers ask: What is ppd test?

What happens if PPD is positive?

The most commonly used skin test to check for TB is the PPD — purified protein derivative. If you have a positive PPD, it means you have been exposed to a person who has tuberculosis and you are now infected with the bacteria (mycobacterium tuberculosis) that causes the disease.

What is a PPD test and what does it test for?

The PPD skin test is a method used to diagnose silent (latent) tuberculosis (TB) infection. PPD stands for purified protein derivative.

How do you know if PPD is positive?

In a healthy person whose immune system is normal, induration greater than or equal to 15 mm is considered a positive skin test. If blisters are present (vesiculation), the test is also considered positive. In some groups of people, the test is considered positive if induration less than 15 mm is present.

How does PPD test work?

For a tuberculin skin test, you sit down and turn the inner side of your forearm up. The skin where the test is done is cleaned and allowed to dry. A small shot of the tuberculosis antigen (purified protein derivative, or PPD) is put under the top layer of skin. The fluid makes a little bump (wheal) under the skin.

Does Tuberculosis stay in your system forever?

Many people who have latent TB infection never develop TB disease. In these people, the TB bacteria remain inactive for a lifetime without causing disease. But in other people, especially people who have weak immune systems, the bacteria become active, multiply, and cause TB disease.

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Is it safe to be around someone with TB?

It is important to know that a person who is exposed to TB bacteria is not able to spread the bacteria to other people right away. Only persons with active TB disease can spread TB bacteria to others. Before you would be able to spread TB to others, you would have to breathe in TB bacteria and become infected.

Why PPD test is done?

A purified protein derivative (PPD) skin test is a test that determines if you have tuberculosis (TB). TB is a serious infection, usually of the lungs, caused by the bacteria Mycobacterium tuberculosis. This bacteria spreads when you breathe in the air exhaled by a person infected with TB.

How often do you need a PPD test?

If you have a negative skin test, you need a repeat test at least once every four years. If you have a documented positive skin test, you must have an initial chest X-ray. After that, you still need to be screened every four years.

Where can PPD be placed?

On a firm, well-lit surface, expose the patient’s arm and slightly flex it at the elbow. The injection should be placed on the palm-side-up surface of the forearm, about 2 to 4 inches below the elbow.

Can you work in a hospital with a positive TB test?

If you have a positive PPD skin test (first or second step), you will be referred to a physician to rule out the possibility of active tuberculosis before you can begin to work in a healthcare facility. If you are uninsured, the RISE Clinic will assist you in your treatment and services.

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How long does it take for a PPD test to go away?

An important note on positive test results: your induration will likely not go away for 3-4 weeks.

What does a positive TB test look like after 48 hours?

If you’ve been infected with Mtb, your skin around the site of the injection should start to swell and harden by 48 to 72 hours. This bump, or induration as it’s referred to clinically, will also turn red. The size of the induration, not the redness, is used to determine your results.

Can PPD test make you sick?

The tuberculin skin test can show if a person has been exposed to tuberculosis (TB) germs. These germs can cause you to feel sick with TB disease or may remain in your body and not make you feel sick.

Can you shower after a TB test?

A: You can take showers and baths as you normally do. Q: What do I do if my arm itches or blisters? A: Put an ice cube in a washcloth and place it on your arm. DO NOT SCRATCH!

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