Rangely, CO · Mountain West
TB Gold Blood Test – QuantiFERON Tuberculosis Lab Test Profile
TB Gold Blood Test – QuantiFERON Tuberculosis Lab Test can be ordered without a referral from your own doctor in Rangely, CO, and this guide covers what to expect. A TB Gold blood test helps detect tuberculosis infection by measuring your immune system's response to TB bacteria.
Lab requirements in Rangely
Here is what you need before ordering and completing the TB Gold Blood Test – QuantiFERON Tuberculosis Lab Test in Rangely, CO. Review each item and confirm the details with the collection lab.
- Physician's order
- Included. A physician's order is required for lab testing and is provided for you by our partner's physicians — no referral from your own doctor is needed.
- Fasting
- Some tests require fasting or avoiding certain foods or drinks beforehand. You will be informed when you order — confirm the details with the collection lab.
- Preparation
- No special preparation is usually needed, but follow any instructions provided by the collection lab. They may have specific guidelines about timing or other factors.
- Sample & visit
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Identification
- Bring the lab requisition form from your account. The collection lab may also ask for a government-issued photo ID.
- Turnaround
- 1-3 business days
- Availability
- Our partner lab does not serve ND, RI, NY, NJ, MD or HI. Confirm availability for your location with the collection lab.
Before you go
- Order your test before visiting a lab, then use the requisition form in your account.
- Print the requisition form, or fax it to the lab directly from your account.
- No scheduling is needed — visit the collection lab during its normal business hours.
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Bring a government-issued photo ID in case the lab requests it.
- Results are posted to your secure account within 1–3 business days.
Requirements are summarized from our partner lab's published policies. Preparation and availability can change — confirm current instructions with the collection lab before your visit.
What this test is
This test, often called a QuantiFERON TB test, is a blood test that checks whether you have been infected with the bacteria that cause tuberculosis. It works by measuring the release of a substance called interferon-gamma from your white blood cells when they are exposed to TB proteins.
What it measures
- Interferon-gamma — A substance released by immune cells in response to TB proteins
- Nil control — A baseline measurement to account for background interferon-gamma
- Mitogen control — A positive control to confirm that your immune cells are functioning properly
- TB antigen response — The level of interferon-gamma produced when your blood is exposed to TB-specific proteins
What the test involves
A healthcare professional will collect a blood sample from a vein in your arm using a standard blood draw. The sample is then sent to a laboratory for analysis.
Why it is often ordered
A clinician may order this test if you have symptoms of TB, have been in close contact with someone who has TB, or need screening because you work or live in a high-risk setting. It is also used before starting certain medications that can affect TB.
Preparation
No special preparation is usually needed, but follow any instructions provided by the collection lab. They may have specific guidelines about timing or other factors.
How results are reported
Results are typically reported as positive, negative, or indeterminate, indicating whether a TB infection is likely. Reference ranges and interpretation can vary by laboratory, so your clinician will explain what your results mean.
Requesting this test in Rangely, CO
Rangely is a smaller community in Mountain West, and residents here have stable access to clinical laboratory services. Across Mountain West, large rural stretches between population centers, so scheduling ahead saves time.
You can review the tests below, read plain-language explanations of each, and request the one you need for Rangely.
Your request stays confidential, and you choose where the specimen is collected. Availability, hours, preparation, and pricing can vary by collection site, so confirm those details with the lab before you go.
Before you go
- Whether any medications you take could affect the test results
- If there are any special timing or handling instructions for the sample
- How and when you will receive your results
FAQ
Frequently asked questions
How accurate is the TB Gold blood test?
The test is generally reliable, but like all tests, it can produce false results. It may not distinguish between latent and active TB, and its accuracy can be affected by certain medical conditions or medications.
What does a positive result mean?
A positive result suggests that you have been infected with TB bacteria. However, it does not tell whether the infection is latent or active, so further evaluation by a clinician is needed.
Do I need to fast before this test?
Fasting is not typically required for a TB Gold blood test. However, always check with the lab or your healthcare provider for any specific instructions.
Can this test replace a chest X-ray or sputum test?
No, this test is just one tool. If TB is suspected, your clinician may also order a chest X-ray, sputum tests, or other evaluations to confirm a diagnosis.
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