Quantiferon TB Gold®

Quantiferon TB Gold® test is a screening test for Tuberculosis. It is a type of IGRA test (Interferon Gamma Release Assay). The test measures the cell-mediated responses to antigens of Mycobacterium tuberculosis. Quantiferon testing was FDA approved in 2001. The test involves having a blood sample taken and sending the specimen to the lab for analysis.

The Quantiferon test can be used as an alternative to either a one step or two step Tuberculosis skin test. Like a TB skin test, the Quantiferon does not distinguish between active or inactive TB. The most recent guidelines from the CDC recommend Quantiferon in most situations.

Tuberculosis screening is often required for health care workers, students, immigration medical exams, international travelers and other people who may be at risk. Sometimes, the tuberculosis skin test is inconvenient due to the need to return in 48-72 hours to have the injection site checked.

Like TB skin testing, live vaccines may interfere with the Quantiferon test results. The CDC recommends the Quantiferon be given either on the same day as live-virus vaccines or at least 4 weeks after live vaccines. Live-virus vaccines include MMR, Varicella, Shingles, Yellow Fever, Smallpox and Intranasal Influenza

Advantages of the Quantiferon TB Gold® include:

  • Not needing to return for the test results like the TB skin test which requires 2 visits (we can send the results to you, your school or work)
  • BCG vaccine will not cause a false positive in Quantiferon test as it sometimes does with a TB Skin test
  • Results are usually available in 3-5 business days
  • Can be used in all circumstances in which a TB Skin test is recommended

Limitations of the Quantiferon TB Gold® include:

  • Not recommended in children 5 years old
  • Limited data on immunocompromised individuals
  • Persons very recently exposed to TB

After Testing

Results will be reported as:
  1. Negative (Normal)
  2. Indeterminate (the test was unable to determine a result of negative or positive and the test should be repeated with a new blood sample)
  3. Positive (Abnormal)

Diagnosis of Tuberculosis

Diagnosis of Tuberculosis infection and decisions about personal or public health should be based on other clinical information as well as Quantiferon results.

If you have a positive Quantiferon result, you should be evaluated for the likelihood of progression to active Tuberculosis by either the public health Tuberculosis Clinic or your Primary Care Provider and a Chest x-ray.

TB Skin Testing

A TB skin test is used to determine if a person already has immunity to the Tuberculosis bacteria. This can occur if someone has TB, if they were exposed to TB in the past, or if they received the BCG vaccine. A liquid is injected in the top layers of skin on the forearm, and the injection site is checked 48-72 hours later for a specific reaction.

Read More About TB Skin Testing
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Rachel was amazing and I was in and out so quick ! Ready to start my new job ! Thanks 🥰

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J was awesome at talking me through my first time getting blood taken. The doctor that also did my physical was quick and very thorough when letting me know the next steps for getting the test results back :)

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Quick n staff very nice

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I’ve used e7 more than once and am always impressed by the friendliness of the people who work there, as well as. The cleanliness and efficiency. I’ll go back to that location on Rainbow for any future needs. Great service!

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Very easy to register through the link sent. They took me in very quickly and the staff was friendly!

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Everyone was so nice, I literally saw them get through to all of their patients fast. To narrow it down it was Fast, Friendly, Service. Thank you ladies at E7 Health

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E7 Health Reviewer Shannon Burton
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I recently visited this clinic for the services and shots required for my immigration case, and I must say, the experience was exceptional. From the moment I checked in to the time I left, everyone I interacted with was incredibly nice, courteous, and professional. The staff was well-informed and had all the necessary information readily available to assist me. They were patient, thorough, and made sure I understood everything I needed to know. This was such a positive experience compared to other clinics I've visited. If other healthcare providers were even half as friendly and knowledgeable as the team here, I would definitely be more inclined to visit them more often. I highly recommend this clinic to anyone in need of medical services, especially for immigration-related requirements. Thank you for making the process so smooth and stress-free!

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E7 Health Reviewer Victoria Rodriguez
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The staff was very helpful, informative & sweet!

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(Translated by Google) Excellent service (Original) Excelente atención

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