Undergo a tuberculin skin test to detect potential exposure to TB bacteria. This may be necessary if TB is suspected by your physician or if you are deemed to be at risk.
Factors that elevate the risk of TB:
- Close proximity to an individual with active TB
- Birth or extended stay in countries with high TB rates
- Compromised immune system such as HIV
- Employment in healthcare environments
Expand your knowledge about TB.
What is the procedure for the skin test?
A small dose of tuberculin is injected into the skin on your forearm. The test does not contain live bacteria and will not transmit TB to you.
- A small blister may emerge but will vanish rapidly
- If there is bleeding, a nurse will apply a swab for 10 minutes
- Avoid using creams or band-aids, opt for ice if itching occurs
Image credit: Bruce Blausen Wikimedia Commons
Interpreting the results of the Tuberculin skin test
After 2-3 days, a technician will evaluate your skin’s reaction. Interpretation depends on various factors such as contact with TB, BCG vaccination, age, and medical history.
A negative outcome may necessitate a repeat test, vaccination, or no further action. A positive outcome may lead to treatment, additional tests, or consultation.
Additional Information
Access more details regarding the skin test through the provided links below.
Tuberculin skin testing (external link) Centers for Disease Control and Prevention, US, 2011
Tuberculin skin test (external link) Queensland Department of Health, Australia, 2013
Discover the procedures of the skin test, comprehend the results, and their implications.
- Download a printable PDF version:
TB Skin Test (Mantoux) (PDF)
The TB skin test can identify latent TB infection.
What is latent TB infection?
TB comprises two stages: latent infection and active disease. Transmission of TB occurs through airborne pathogens from person to person.
| Phase 1 – Latent TB Infection | Phase 2 – Active TB Disease |
|---|---|
| TB bacteria are dormant in your system. This phase can endure for years. | TB bacteria are active and causing harm. |
| You do not exhibit any symptoms. Typically, your chest x-ray is normal. | You usually feel unwell. Diagnostic tests reveal the location of TB. |
| You are not contagious. | You can transmit TB through coughing or sneezing. |
| Treatment involves a solitary medication for 9 months. | Treatment comprises 3-4 medications for over 6 months. |
| Latent TB infection carries a risk of progressing to active TB disease if left untreated. | Active TB disease requires immediate treatment to prevent further transmission and complications. |
How can I tell if I have latent TB infection?
A TB skin test can detect latent TB infection. Medical professionals administer harmless tuberculin under your skin for examination.
Physicians must assess your arm 2-3 days later, even if no visible changes are apparent to you.
If a bump forms, the physician will measure it. Bumps typically dissipate within a few weeks.
How do I take care of my arm after the TB skin test?
- Avoid applying bandages or tape on the injection site
- Refrain from rubbing or scratching the area
- If experiencing itchiness, utilize a cold compress
- Gently cleanse and dry your arm
- Avoid strenuous activities that may cause excessive sweating in the area
- Avoid submerging the injection site in water, such as swimming pools or hot tubs
- Keep an eye out for any signs of infection, such as redness, swelling, or discharge, and contact your healthcare provider if you notice any of these symptoms
- Follow any additional instructions provided by your healthcare provider for care and monitoring after the TB skin test
What if my TB skin test is negative?
A negative TB skin test indicates the absence of a bump, signifying no TB infection. In certain circumstances, a follow-up test may be required.
Interpreting TB skin test results:
It is important to understand the results of a TB skin test to determine the next steps. Here is a general guideline:
- Positive result: A bump of a certain size indicates TB infection. Further evaluation is needed to confirm and assess the extent of the infection.
- Negative result: No bump or a very small bump suggests no TB infection. However, if there is a recent exposure to TB, a follow-up test may be necessary.
- Indeterminate result: Sometimes, the test result may be inconclusive due to various factors. Further testing or a different approach may be required.
Precautions and post-test care:
After a TB skin test, it is important to take certain precautions and care to ensure accurate results and monitor for any adverse reactions. Here are some tips:
- Avoid rubbing or scratching the injection site to prevent false results.
- Keep the injection site clean and dry to prevent infections.
- Observe the site for any unusual reactions such as excessive redness, swelling, or warmth.
- Report any unusual symptoms or reactions to your healthcare provider.
Remember, early detection and proper management of TB infection are crucial for successful treatment and prevention of further spread. Stay informed, get tested, and prioritize your health and well-being!
Determining an approach
The CDC provides resources to support healthcare providers in discussing TB testing and treatment with patients.
The CDC suggests TB blood tests in most cases, while skin tests are deemed suitable alternatives in specific situations.
Almost everyone is eligible for a TB skin test, with exceptions for individuals who had severe reactions to previous tests. Infants, children, pregnant women, and those with HIV can also undergo the test.
- Sputum smear microscopy, culture, and molecular testing for TB
If TB disease is ruled out, the individual should be evaluated for latent TB infection (LTBI) and, if necessary, treated for LTBI. This involves conducting:
- A TB blood test
- Other medical evaluations and tests as required
Healthcare providers should consider the individual’s risk factors for TB infection and progression to TB disease when determining further testing and treatment. It is crucial to adhere to current guidelines and seek advice from TB experts when needed.
- Appropriate bacteriological examinations of sputum specimens
If latent TB infection is diagnosed, there are brief and convenient treatment options available. Treatment is 90% effective in preventing the development of TB disease.
A negative TB skin test result does not rule out the presence of TB disease, particularly in patients with severe TB illness or HIV.
Reminder
All individuals with clinically active or suspected TB disease should be reported to the local or state health department.
Latent TB infection is reportable in certain states and regions. Refer to your state TB program for details on reporting requirements.
Today’s focus is on what actions to avoid following a TB test. Without further ado, let’s delve into today’s article.
What is TB skin test:
A tuberculin skin test, also known as a TB skin test or Mantoux test, is performed to determine if an individual has been infected with the bacteria that causes tuberculosis (TB).
The steps involved in a TB skin test are outlined below:
- A small amount of purified protein derivative (PPD) is usually injected under the skin of the arm.
- The injection site is monitored after 48 to 72 hours for a reaction. If the individual is infected with TB bacteria, their immune system may respond to PPD, resulting in a red rash at the injection site.
- The size of the bump and the patient’s medical history are used to determine the test results. A larger bump typically indicates a strong reaction and possible TB infection.
A large bump is not always indicative of TB. Additional tests may be requested by the physician.
Table of Contents
what not to do after a tb test
Following a tuberculosis (TB) test, refrain from scratching, applying creams or lotions, covering the site with a bandage, engaging in strenuous physical activity, consuming excessive alcohol, or expecting immediate results. Adhere to the recommended guidelines for accurate results.
where to get a tb test ?
To schedule a TST or TB test appointment, visit diagnostic centers or clinics. CVS Pharmacy also provides this service via CVS Minute Clinic online.
It is important to consult with your healthcare provider or local health department to determine the best location for getting a TB test. In addition to diagnostic centers and clinics, some hospitals and public health departments may also offer TB testing services.
Before getting a TB test, make sure to check the requirements and any necessary preparations such as fasting or avoiding certain medications. It is also important to follow any post-test instructions provided by the healthcare provider to ensure accurate results.
how much is a tb test at cvs:
Cost of TB Skin Test at CVS Minute Clinic:
- $35 at the initial stage
- $30 for reading after 48-72 hours
- Total $65
TB skin test is not covered by insurance.
what does a negative tb test look like pictures
PPD injection may elicit various reactions. Patients may develop both small and large bumps.
Conclusion:
Adhere to the recommended guidelines for accurate TB skin test results. Attend the follow-up appointment as advised by your physician. Your active participation is crucial for the efficacy of TB testing.
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