How to tell if tb test is negative?

Question

I recently had a TB test because of my work, and the nurse just said to come back in a few days. I'm not sure what to look for when I check it. How can I tell if my TB skin test is negative?

Shruti Gupta · Accepted Answer

After a TB skin test (Mantoux test), they usually check it after 48-72 hours. If there's no swelling or a very small, flat bump, it's negative. The doctor will measure it. For blood tests like IGRA, it's just a lab report saying 'negative'. Don't try to read it yourself, the lab report is clear!

Anjali Mehta · Answer

My doctor explained that for a Tuberculin Skin Test (TST), a negative result means the induration (hard, raised bump) at the injection site is less than 5mm after 48-72 hours. For an IGRA blood test, the lab report will explicitly state 'Negative' if no TB infection is detected. Always consult your doctor for the official interpretation.

Rohan Das · Answer

Bro, for the skin test, if there's no big red bump or swelling where they injected, it's generally negative. The nurse or doc measures it. For blood test, the report just says 'Negative' or 'Positive'. Super simple, no rocket science. Just get the report or check-up from the clinic.

Deepa Sharma · Answer

After the skin test, if there is no significant swelling or hardness, it means your body did not react, suggesting no TB infection. The doctor will measure it carefully. For blood tests, the report itself will say 'negative'. It brings peace of mind, knowing your body is healthy. Just follow the doctor's guidance.

Sanjay Rao · Answer

Ah, the TB test. If they prick your arm and two days later it just looks like a tiny mosquito bite and not a swollen red mountain, then congratulations, you're probably in the clear! Or, just read the 'Negative' on the blood test report. Honestly, anything to avoid more medical drama, right?

How to tell if tb test is negative?

5 answers

Consult a internal medicine specialist

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