Tuberculosis Skin Tests

Tuberculosis (TB) is a disease caused by a germ called Mycobacterium tuberculosis. It spreads from person to person through the air. TB usually affects the lungs, but it can also affect other parts of the body, such as the kidneys or spine.

A TB skin test checks if you have a latent TB infection, which means you have TB bacteria in your body but aren’t sick or contagious.

Here’s how the test works:

1. A small amount of liquid (tuberculin) is injected under the skin on your arm

2. You’ll return two days later for us to check the area and provide your results

Knowing how the test works will help you prepare for the appointment.

Who can get a TB skin test at the health unit?

You can get a TB skin test at Southwestern Public Health if:

• You need the test for a medical reason and have a letter from your health care provider

• You are new to Canada and need the test for immigration purposes

• You’ve recently been in contact with someone who has active TB

How do I book a test?

To book your TB skin test, please call us at 1-800-922-0096. If you need a test for work, school, or volunteering, contact your health care provider.

What should I do if I have a positive TB skin test?

A positive TB skin test means you might have latent TB. It does not mean you have active TB. Here’s what to do:

• Call your health care provider to book an appointment.

• Keep a record of your TB skin test result. Don’t repeat the test, it will always remain positive.

• Your health care provider may:

  • Order additional tests (e.g., a chest x-ray) to rule out active TB

  • Talk to you about taking medicine for latent TB