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8 answers

You didn't say what kind of TB test, I assume you mean the "Mantoux" test where a small amount of antigen is injected just below the skin surface.

Image of a "strongly" positive Mantoux test:
http://www.immunologyclinic.com/figure.asp?chap=13&fig=HH10_300

This does not mean you have TB just that at one time you were exposed to it, some people may carry it their whole life and never develop TB. Assuming a positive result they would probably then give you a chest Xray and/or test your phlegm to determine if you actually have it or are just a carrier.

2007-03-05 15:55:45 · answer #1 · answered by partygrl319 3 · 1 0

In order for a TB test to be considered positive it must remain raised (elevated) above the skin by 2mm after 48 hours. This is the mantoux test that is injected under the skin of the inner forearm. Nothing else matters other than the elevation. A lot of people react differently to this test and it does irritate the skin a little bit sometimes.

If this test is considered positive it needs to be followed up with a chest xray.

2007-03-05 15:58:57 · answer #2 · answered by Suean 2 · 1 0

Depending on what test is done.

1. The PPD ( Skin test) measures the size of induration in Millimeters. The reagent is injected on the proximal part of your forearm and left for 24 hours.

2. The Sputum test determines if there are AFBs ( Acid Fast Bacilli) In the sputum. The bacilli appear as red rods on the microscope when an acid is introduced on the slide with the bacilli infected sputum.

3. There are other new tests which have not yet gone onto the market or are still in the phase III trial phase.

2007-03-07 04:40:16 · answer #3 · answered by emanzit 3 · 1 0

The test shouldn't be read until 48 hours after it was administered. A positive test will result in a red bump at the site of the injection.
Keep in mind though that there will be a welt there (like a mosquito bite) initially but this will fade in a normal, negative individual.
Here is a link that might help!

2007-03-05 15:52:52 · answer #4 · answered by Sheree H 3 · 1 0

Did you have a TB TINE test in your forearm? There is a measure that is held up against your arm to see how much inflammation there is around the site. Whomever gave you the test should be reading it. If it is positive, they usually tell you to have a chest x-ray, and don't have a TB TIne test again.

2007-03-05 15:50:39 · answer #5 · answered by bflogal77 4 · 1 0

Normally, if you had the testing where they put a shot into you, and you wait the number of days to see if it reacts.........a positive test will look red and slightly, at least, swollen. Remember, false positives DO happen. I have heard that a positive IS a positive test, but, when my son had a positive test, they said it was a FALSE positive. At any rate, wait until your health person reads your tested area, before you panic.

2007-03-06 01:19:16 · answer #6 · answered by laurel g 6 · 1 0

the spot where you were injected will swell, turn red, itch, and or burn. if you are negative you wont have a reaction.
perfecta

2007-03-05 15:53:22 · answer #7 · answered by perfecta 1 · 1 0

when the bubble under the skin doesn't go down.

2007-03-05 15:50:49 · answer #8 · answered by Anonymous · 1 0

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