You'll know if your skin test is positive if you have swelling or a raised bump at the injection site of the testing fluid. A healthcare professional will measure this bump or swelling and determine if the reaction indicates a positive result.
Here's a breakdown of what to expect:
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The Test Procedure: A small amount of testing fluid is injected just under the skin.
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Waiting Period: You'll typically need to return to the clinic or healthcare provider within 48-72 hours (2-3 days) after the injection for the results to be read.
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Positive Result Indication:
- Swelling or Bump: A positive reaction usually involves a noticeable raised bump (called an induration) or swelling at the injection site.
- Measurement: The healthcare worker will measure the size of the bump or swelling in millimeters. The size required to be considered positive varies depending on the specific test and individual risk factors.
- Healthcare Professional's Assessment: The healthcare professional will interpret the measurement and inform you whether your skin test reaction is positive or negative.
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Important Considerations:
- Timing is Crucial: It's important to return for the reading within the specified timeframe (usually 48-72 hours). If you cannot return within that time, you'll likely need to repeat the skin test.
- Individual Factors: Factors like previous vaccinations or certain medical conditions can sometimes affect the results. Be sure to inform your healthcare provider of your medical history.
In short, a positive skin test is determined by the presence and size of a bump or swelling at the injection site, as assessed by a healthcare professional within a specific timeframe.
