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Where Can I Get Quantiferon Tb Gold Test

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Price Of Quantiferon Tb Gold Test In The Philippines

Quantiferon TB Testing

Some people may not be familiar with this test but many hospitals are offering this procedure to diagnose infections of TB. Usually, this test is used as an alternative to tuberculin skin test. The cost of Quantiferon-TB Gold Test in the Philippines can range from Php 7,500 to Php 10,000 or above.

Note that the price is an approximate since hospitals and clinics may charge differently.

Question 5 What Are Conversion And Reversion

Conversion: With respect to TB antigens, conversion is the point at which IFN- becomes detectable above the established threshold or cutoff from a previous negative or unknown result.

Reversion: The opposite of conversiona result that goes from above the established cutoff to below the cutoff . While there are no data derived using the QFT-Plus test, there are numerous publications on conversion/reversion based on the QuantiFERON-TB Gold test.

In one study of the QuantiFERON-TB Gold assay, among individuals with quantitative IFN- values just above or just below the cutoff threshold, reversions and conversions were common.5 Per the package insert, it is prudent to confirm a positive QFT-Plus test by the same or alternate method before starting therapy if M tuberculosis complex infection is not suspected.

Understanding Results Ofquantiferon Tb Gold

Reference Range
Above 0.35 IU /ml Positive

*A Reference range is a set of values which helps the healthcare professional to interpret a medical test. It may vary with age, gender, and other factors. Reference ranges may also vary between labs, in value & units depending on instruments used and method of establishment of reference ranges

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What Are The Advantages Of The Quantiferon

This blood test can measure active and latent TB infections, but only in adult patients. The TST is still considered the standard for children. Only one visit is required for this blood test instead of multiple visits with the TST, which saves everyone time and money.

There are some additional advantages that this blood test has over the TST as well.

Improved specificity.Instead of needing to visually judge a skin test, there is a set of baseline markers that test results can be compared against universally to determine if a TB infection is present.

There is less bias.Because the results of the blood test are measured universally, there is no local bias present in reading the results.

It cant be boosted.The TST will eventually become an inaccurate measurement of a TB infection because of what is known as the âboosterâ effect. After several skin tests, it is common for false positives to be read. The QuantiFERON-TB Gold blood test eliminates this effect completely.

It is accurate.Individuals who have received a BCG vaccination in the recent past will not receive accurate TST results. This blood test eliminates the inconvenience.

Although the accuracy of this blood test is often better than the TST, it is not appropriate for some individuals. Be sure to speak with your doctor about this TB test and if it could be right for you.

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Latent Vs Active Tuberculosis

Why Should Providers Choose QFT

There are two types of tuberculosis latent TB and active TB. The QuantiFERON TB Gold test does not distinguish between these two, but they differ based on how they manifest in an infected person. This is because everyone’s immune systems are different. Some can appear more, or less, sick than others.

Latent TB is when you are infected with tuberculosis, but you are not exhibiting any symptoms because the bacteria residing in your body is inactive. Also referred to as inactive TB or a TB infection, this type of tuberculosis is not contagious. However, there is a possibility that the bacteria can become active, so it’s still crucial for someone with latent TB to seek guidance from a medical provider.

Active TB, on the other hand, is when you are infected with the bacteria and show symptoms of the illness. Also referred to as TB disease, this type of tuberculosis is contagious. Latent TB can become active TB after several weeks, or even years, after infection.

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Tb Quantiferon Gold Test


  • This is a whole-blood test for use as an aid in diagnosing Mycobacterium tuberculosis infection, including latent tuberculosis infection and tuberculosis disease.
  • The test is only available after discussion with a Consultant Microbiologist.
  • The test can be used in all circumstances in which the tuberculin skin test is currently used. However, caution should be used when testing certain populations because of limited data. These include:
  • Children younger than 17 years of age
  • Persons recently exposed to M. tuberculosis
  • Immunocompromised persons .
  • Various steps in the processing of these specimens are time critical. Therefore samples can only be taken on a Monday, Tuesday or Wednesdayand must be received in the laboratory before 5.00pm on the same day. If taken in Cheltenham, please allow time for transport to Gloucester.
  • See also:
  • QuantiFERON -TB Gold test kits are available from the Microbiology Laboratory on a named patient basis

    A specimen collection protocol sheet is provided with the kit.

    Collection method

    • The kit contains 4 collection tubes:
    • Grey cap: Nil control
    • Green cap: TB antigen 1
    • Yellow cap: TB antigen 2
    • Purple cap: Mitogen control
  • For each patient collect 1ml of blood by venepuncture directly into each of the 4 Quantiferon collection tubes.
  • If a butterfly needle is being used to collect blood, a purge tube should be used to ensure that the tubing is filled with blood prior to the Quantiferon TB tubes being used.
  • Tb Quantiferon Blood Test

    The online QuantiFERON-TB Plus Blood Test is used to aid in identifying infections with Mycobacterium tuberculosis, the bacteria that causes Tuberculosis . One of only 2 FDA-approved blood tests for TB, the Quantiferon test provides a convenient testing option with a higher degree of accuracy than other older methods for TB testing. The Quantiferon test has a sensitivity as high as 94% in detecting infection with TB. Unlike the 2-step skin test for Tuberculosis, a blood test requires only one trip to the lab for a simple blood draw.

    While TB is not as common in the United States as it once was, there is still a risk posed by TB infection. Over 7,000 new cases of TB were reported in the US in 2020. It is estimated that 11 million people in the US have a latent tuberculosis infection . Diagnosis and treatment of LTBI can prevent it from progressing to active Tuberculosis. For more information, please see the CDC website.

    Customers who are testing to meet requirements for work, school, or travel should verify if a TB blood test will meet their requirements.

    Turnaround time for this test is typically 3-5 business days.

    Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.



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    Quantiferon Tb Gold Plus Blood Test

    The QuantiFERON TB Gold Blood Test is an in vitro assay to aid in the diagnosis of both latent and active infection with Mycobacterium Tuberculosis.

    Also Known As: Interferon-gamma Release Assay for Mycobacterium tuberculosis

    Methodology: Whole blood interferon-gamma test measuring responses to CD4+ and CD8+ T cell antigens

    Preparation: No fasting required. This test requires a special collection kit that may not be available at all LabCorp locations. Contact your local LabCorp draw site to verify they have the collection kit in stock before visiting the lab.

    Test Results: 7-10 days. May take longer based on weather, holiday or lab delays.

    Also Known As: Interferon-gamma Release Assay for Mycobacterium tuberculosis

    Methodology: Immunoassay

    Preparation: No fasting required. This test requires a special collection kit that may not be available at all LabCorp locations. Contact your local LabCorp draw site to verify they have the collection kit in stock before visiting the lab.

    Test Results: 4-6 days. May take longer based on weather, holiday or lab delays.

    Advantages And Limitations Of The Quantiferon Tb Gold Test

    QuantiFERON-TB Gold Plus [Hot Topic]

    As with most medical processes, the QuantiFERON TB Gold test has its pros and cons. If you are suspected to have TB and your doctor recommends that you undergo this test, keep in mind its advantages and limitations:


    • Unlike a TB skin test, which needs two visits, you dont have to go back to the testing facility for your test results. They can be sent to you directly, or to your school or workplace.
    • The results are typically released within three to five business days.
    • The results are valid for all cases that would normally need a TB skin test.
    • Unlike a TB skin test, the BCG vaccine will not render false positives in a QuantiFERON TB Gold test.


    • It’s not recommended for children who are under five years old .
    • It may render inaccurate results for people who were recently exposed to TB.
    • There is limited information on its suitability for those who are immunocompromised.

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    Tb Regional Training Centers

    Valuable resources are available from the US Centers of Disease Control and Prevention The CDCs Division of Tuberculosis Elimination has funded five TB Regional Training and Medical Consultation Center . These centers provide training, technical assistance, medical consultation, and the development of education materials to TB programs and healthcare providers . To learn more about the RTMCC that covers your region, visit

    Ppd Test Vs Quantiferon

    A job candidate needs a tuberculosis test, but which test do they choose PPD test or QuantiFERON?

    When choosing a tuberculosis test, a patient must consider many factors, including cost, efficiency and availability. Additionally, medical terms and acronyms associated with tuberculosis may confuse patients. For this reason, we created a Tuberculosis Test Fact Sheet. Below we outline the pros and cons of two most commonly used tuberculosis tests: Purified Protein Derivative Test and QuantiFERONS.

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    Question 2 How Does Quantiferon

    The QFT-Plus assay is a blood test for M tuberculosis infection that is based on measurement of a cell-mediated immune response. A peptide cocktail simulating the mycobacterial proteins ESAT-6 and CFP-10 stimulate the patients T cells in vitro to release IFN-, which is then measured using ELISA technology. The test detects infections produced by the M tuberculosis complex, which includes M tuberculosis, as well as certain non-tuberculous mycobacteria, including M kansasii, M szulgai, and M marinum. BCG strains and the majority of other non-tuberculous mycobacteria do not harbor ESAT-6 and CFP-10 proteins thus, patients either vaccinated with BCG or infected with most environmental mycobacteria should test negative. Results should always be interpreted in conjunction with other clinical and laboratory findings.

    Interpretation Of The Quantiferon Tb Gold Test Results

    Tuberculosis, Newer Diagnostic Trends

    After the blood sample is taken and analyzed, the QuantiFERON TB Gold test will render one of the following results:

    • Negative or Normal
    • Positive or Abnormal
    • Indeterminate, which means that the test could not give a definitive negative or positive result. In this case, generally, the test must be retaken with a fresh blood sample.

    However, the QuantiFERON TB Gold test alone does not confirm the diagnosis of tuberculosis infection. The diagnosis is evaluated and decided upon by a medical professional based on the test results, as well as other clinical information. Patients who receive a positive test result should be evaluated by a medical professional to see if they are likely to progress to active TB. They may also be recommended to undergo a chest x-ray.

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    Quantiferon Gold Tb Blood Test

    The QuantiFERON Gold test, also known as a TB blood test, QuantiFERON test, QFT test and IGRA test, is a blood test that screens for tuberculosis . The QuantiFERON test was created to help identify people who have been exposed to a bacteria that causes tuberculosis known as Mycobacterium tuberculosis, or M. tuberculosis.

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    How Do You Confirm Tuberculosis

    The Mantoux tuberculin skin test or the TB blood test can be used to test for M. tuberculosis infection. Additional tests are required to confirm TB disease. The Mantoux tuberculin skin test is performed by injecting a small amount of fluid called tuberculin into the skin in the lower part of the arm.

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    Summary Of Recent Clinical Trials Of 3hp

    An open-label trial was performed in Soweto, South Africa to evaluate four regimens for preventing tuberculosis among HIV-infected adults with positive tuberculin skin tests . Participants were randomized to either:

  • rifapentine 900 mg plus isoniazid 900 mg, once weekly for 12 weeks
  • rifampin 600 mg plus isoniazid 900 mg, twice weekly for 12 weeks
  • isoniazid 300 mg daily for the duration of the study or
  • isoniazid 300 mg daily for six months .
  • This study was designed to assess the potential superiority of the three trial regimens to 6H. Incidence of TB per 100 person-years was 2.0 for the 3HP group, 2.0 for the 3HR group, 1.4 for the continuous H group, and 1.9 for the 6H group none of these differences were statistically significant, and no regimen was superior to 6H. There was a trend towards more adverse events in the continuous H group when compared with the two rifamycin-containing regimens, and adherence was higher for those taking the 12-week regimens. Among those who developed TB, there were two cases of rifampin resistance in the 3HP group, none in the 3HR group, and one in the continuous H group.

    What Is The Quantiferon Test

    Next generation TB testing with QuantiFERON TB Gold Plus

    QuantiFERON test is a blood test used to diagnose Mycobacterium tuberculosis. This bacterium causes tuberculosis. This is an interferon-gamma test release assay commonly known as IGRA. In other words, this test is an alternative to the tuberculin skin test and is currently available in public health laboratories, hospitals, and commercial laboratories across the United States.

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    Question 1 What Is Quantiferon

    The QuantiFERON-TB Gold Plus assay is an in vitro diagnostic test that utilizes a peptide cocktail simulating ESAT-6 and CFP-10 proteins to stimulate cells in heparinized whole blood. Detection of interferon- by enzyme-linked immunosorbent assay is used to identify in vitroresponses to these peptide antigens that are associated with Mycobacterium tuberculosis infection. QFT-Plus is an indirect test for M tuberculosis infection and is intended for use in conjunction with risk assessment, radiography, and other medical and diagnostic evaluations. This test does not differentiate between latent and active tuberculosis .1

    CDC recommendations state that2,3

    • An interferon gamma release assay may be used in place of a tuberculin skin test in all situations in which CDC recommends TST as an aid in diagnosing adult M tuberculosis infections.

    • An IGRA or a TST may be used without preference to test recent contacts of persons known or suspected to have active TB with special considerations for follow-up testing. IGRAs offer the possibility of detecting M tuberculosis infection with greater specificity than with a TST. If IGRAs are to be used in contact investigations, negative results obtained prior to 8 weeks after the end of exposure typically should be confirmed by repeat testing 8 to 10 weeks after the end of exposure.

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    Does Medicare Cover Quantiferon Gold Test

    Tuberculosis, commonly referred to as TB, is a disease transmitted from one person to another by way of germs that are airborne. TB is typically associated with the lungs, but it can also involve the brain, kidneys, spine and other areas of the body. Without treatment, TB can be fatal. QuantiFERON®-TB Gold In-Tube test is a test your doctor may recommend to determine if you have been infected.

    Medicare Benefits Solutions

    Tuberculosis If you inhale air contaminated with TB germs, you can get a latent TB infection . This means that the germs have permeated your system but the condition is dormant. Because the germs are not active, you may not feel sick. At this stage, you cannot spread the germs to other people, but you can develop TB disease. Once the disease develops, you are likely to have symptoms and be contagious.

    If you have spent time with someone who suffers from TB disease, testing is advisable. You can get tested in one of two ways, either a skin test or a blood test. A positive TB skin test reveals a reaction at the test site, the lower part of your arm. A positive TB blood test registers how your immune system responds to the germs that spawn the disease.

    ResourcesRead about tuberculosis testing, treatment, statistics and trends on the Centers for Disease Control and Prevention website at

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    What Are The Pros And Cons Of Ppds

    Typically, the PPD implant provides the most affordable Tb test option. However, due to the required second visit for reading, the PPD may not be the most cost-effective choice. Also, false positives, one of the drawbacks of PPDs, can happen regularly. Ultimately, these drawbacks can cost you or your agency an extra week of waiting for exams.

    Benefits Of The Quantiferon Technology

    QuantiFERON Gold vs T
    • Use of whole blood in QFT makes T cell incubation simple and fast, and reduces labor
    • No tedious lymphocyte isolation, washing, counting, diluting, or culturing
    • Technology designed for clinical screening of large sample numbers, providing the standards, controls, and assay reproducibility needed for clinical diagnosis

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    Question 4 How Do You Interpret The Quantiferon

    An example of a QFT-Plus report is shown below:

    • Nil or Negative Control Tube

    The nil value comes from the negative control tube, which contains no additives it is used to determine if the patient has a preexisting immune response , which could cause a false-positive reading on the test.

    For a test to be valid, the nil tube must have a value of 8.0 IU/mL. In the example cited above, the nil value is well within the recommended range of 8.0 IU/mL. The nil tube value is subtracted from the values of the mitogen, TB1, and TB2 tubes for the final result of the respective tubes.

    • Mitogen or Positive Control Tube

    The mitogen, or positive control, tube contains a mitogen , which is a nonspecific stimulator of T-cells. It is used to assure that the patients T cells are capable of producing IFN- and also serves as a control for correct blood handling and incubation. The mitogen tube is also used to detect false-negative readings.

    For a test to be valid, the mitogen tube must have an IFN- value at least 0.5 IU/mL higher than the value of the nil tube. This indicates that the test is functioning properly.

    In the example cited above, the mitogen tube value minus the nil tube value is well above the minimum breakpoint of 0.5 IU/mL.

    • TB1 Antigen

    The inside of this tube is coated with M tuberculosisspecific antigens designed to elicit CMI responses from CD4+ T-helper lymphocytes.

    • TB2 Antigen

    Calculation of Positive, Negative, or Indeterminate

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