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Tuberculosis (TB) is a highly contagious bacterial infection that primarily affects the lungs but can also affect other parts of the body. To diagnose TB, healthcare professionals often employ the tuberculin skin test (TST), also known as the Mantoux test, which is a simple procedure used to determine if a person has been exposed to the TB bacteria. Interpreting TST results correctly is crucial for accurate diagnosis and subsequent treatment. This guide aims to provide a detailed understanding of how to read and interpret TB skin test results, enabling individuals to gain valuable knowledge about their health and take appropriate action if necessary. Whether you are a healthcare professional involved in TB screening or an individual seeking to understand your own test results, this information will help demystify the process and empower you with the necessary insights to navigate the tuberculosis skin test results effectively.
This article was co-written by Mandpin S. Ziadie, MD. Dr. Ziadie is a licensed South Florida pathologist specializing in pathology and clinical practice. She earned her medical degree from the University of Miami School of Medicine in 2004 and completed her study in Pediatric Pathology at Children’s Medical Center in 2010.
There are 7 references cited in this article that you can view at the bottom of the page.
This article has been viewed 13,234 times.
The TB skin test, also known as the Mantoux test, is a test that measures the immune system’s response to the bacteria that cause tuberculosis. After two days, the test results will be interpreted by your doctor, but if you want to learn how to read the results, this article will guide you through the process. However, you should note that test results should be read by a qualified person. Although you can read it yourself, the results should still be recorded by medical professionals to ensure an appropriate treatment afterwards. [1] X Trusted Source Centers for Disease Contrp and Prevention Go to source
Steps
Read test results
- You should not scratch or rub the injection site, as this will make the test area red and give false results. If you feel itchy, you can use a cold washcloth on your hand. [4] XResearch Sources
- The bump isn’t always visible, so it’s a good idea to look with your fingertips. [7] X Trusted Source Centers for Disease Contrp and Prevention Go to source
- If the marking is between two divisions, use a ruler with smaller units.
Interpretation of test results
- HIV disease
- liver transplant
- weakened immune system for many reasons
- recent contact with a patient with tuberculosis
- chest x-ray test for tuberculosis
- end-stage renal failure [10] X Trusted Source PubMed Central Go to source
- recently immigrated from a country where tuberculosis is common
- inject drugs
- work in a health care setting, prison, nursing home, or similar setting
- at risk for TB because of diseases such as diabetes, leukemia, or being underweight
- Children under 4 years old
- children or adolescents exposed to adults who are at high risk for TB [11] X Credible Sources Centers for Disease Contrp and Prevention Go to source
- Even if you believe your test result is negative, you should still return to your doctor for a professional examination.
Advice
- Perform additional testing as directed by your doctor if the result is positive or near positive.
Warning
- False-positive or negative results can occur in TB testing. If you have questions about the results, consult your doctor as soon as possible.
- Within 72 hours, a TB test should be checked by a qualified, trained and trained person to give the most accurate reading.
This article was co-written by Mandpin S. Ziadie, MD. Dr. Ziadie is a licensed South Florida pathologist specializing in pathology and clinical practice. She earned her medical degree from the University of Miami School of Medicine in 2004 and completed her study in Pediatric Pathology at Children’s Medical Center in 2010.
There are 7 references cited in this article that you can see at the bottom of the page.
This article has been viewed 13,234 times.
The TB skin test, also known as the Mantoux test, is a test that measures the immune system’s response to the bacteria that cause tuberculosis. After two days, the test results will be interpreted by your doctor, but if you want to learn how to read the results, this article will guide you through the process. However, you should note that test results should be read by a qualified person. Although you can read it yourself, the results should still be recorded by medical professionals to ensure an appropriate treatment afterwards. [1] X Trusted Source Centers for Disease Contrp and Prevention Go to source
In conclusion, interpreting tuberculosis (TB) skin test results is an essential skill for healthcare professionals and individuals involved in TB screening programs. Understanding the different types of reactions and their significance is crucial in accurately diagnosing and managing TB infections. Although a positive TB skin test does not confirm an active TB infection, it indicates exposure to the bacteria and the need for further evaluation. False positive and false negative results may occur due to various factors, such as prior BCG vaccination or immunosuppression. Thus, it is important to consider the overall clinical presentation and additional diagnostic tests to make an informed decision. By following the recommended guidelines and seeking expert advice, healthcare providers can effectively identify and treat TB infections, thereby reducing the transmission and burden of this highly contagious disease.
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