Tuberculosis (TB) is a serious lung infection caused by the bacterium Mycobacterium tuberculosis. Finding a cancer early can make a difference in treatment and recovery. The two primary ways to test for TB infection are the TB skin test and the TB blood test. They’re both trustworthy, but they operate differently.
This article will tell you how to make sense of the tests — who they’re for, how effective they are and which one may be the better one for you.
What Is a TB Skin Test?
The TB skin test is also called the Mantoux tuberculin skin test. It has been used for decades to screen for TB infection.
How it Works:
They inject a small amount of fluid (tuberculin) under the skin of your forearm. After 48 to 72 hours, a health care provider will examine the area for a reaction.
What the Results Mean:
- Positive: A raised bump can indicate exposure to TB.
- Negative: Normally, no reaction indicates that you haven’t been infected.
Remember that a positive result doesn’t necessarily indicate that you have the active form of TB. You could have a dormant infection, or an infection in your body but not actively causing illness.
What Is a TB Blood Test?
The TB blood test may be referred to as an Interferon-Gamma Release Assay (IGRA). It’s a new procedure, and with it you only have to go to the clinic one time.
How it Works:
A small blood sample is collected and sent to a laboratory. The test determines how your immune system responds to TB bacteria.
What the Results Mean:
- Positive: You have been exposed to TB.
- Negative: You probably do not have TB bacteria in your body.
The TB blood test is frequently done in people who have received the BCG vaccine (which can cause a false positive on the skin test).
TB Skin Test vs Blood Test: The Basic Difference
Feature TB Test Las Vegas TB Blood TestVisits Needed2 (test and read)1Result Time2–3 days1–2 daysBCG Vaccine InterferenceYesNoCostUsually lowerUsually higherBest ForScreeningPeople with BCG vaccine or difficulty returning back
None are perfect. The best option is based on your health history, access to a clinic and your own preferences.
Who Should Get a TB Test?
If you are: You may need a TB test if you:
- Present with symptoms such as a chronic cough, weight loss or night sweats
- These include employment in healthcare, schools, or jails
- Have had close contact with someone who has TB
- Travel or relocating to places where TB is widespread
- Need Work, School or Immigration Testing?
Which Test Is Better?
The two tests work well, but each is right for different needs.
Choose the skin test if:
- You haven’t received the BCG vaccine
- You may go back to the clinic in 48-72 hours
Choose the blood test if:
- You have had the BCG vaccine
- You want faster results
- You can’t go back for a second look
If you’re not sure which test to take, consult a health care provider for guidance.
Where to Get Tested
Searching for trustworthy TB testing choices? It’s not difficult to find TB test near me services through directories online or simply by calling your local health department.
If you are in Nevada, most clinics offer TB testing in Las Vegas with same-day appointments at a variety of locations and results in 1-2 days.
Final Thoughts
TB is a serious health risk, but early diagnosis can help keep you and others safe. The more important choice is to be tested, if that is what is called for, with the skin test or with the blood test.
Both tests are safe, accurate and serve in diagnosing a TB infection. Speak with your doctor about which is best for you and get started on the path to better lung health.
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