To test for Tuberculosis (TB), doctors use a TB blood test, also known as an interferon-gamma release assay (IGRA).
Understanding TB Blood Tests
TB blood tests are designed to detect if you have been infected with TB bacteria by measuring your body's immune response. Here’s how they work:
- A small sample of your blood is collected.
- This blood sample is then mixed with specific TB proteins.
- The test then measures how your immune system reacts to these proteins. This reaction is measured by the release of interferon-gamma.
- If your immune system has encountered TB bacteria before, it will produce interferon-gamma in response.
Key Aspects of TB Blood Tests
| Feature | Description |
|---|---|
| Name | Interferon-gamma release assays (IGRAs) |
| Sample Used | Blood |
| Method | Measures the reaction of your immune system when your blood sample is mixed with TB proteins. Specifically looks for the release of interferon-gamma, a protein your body produces when exposed to TB. |
| Purpose | To determine if you are infected with TB bacteria. |
Practical Insights
- TB blood tests are often used as an alternative to skin tests.
- These tests are especially useful for individuals who have received the BCG vaccine because the vaccine can lead to false-positive skin test results.
- Results can help healthcare professionals determine the best course of treatment.
