Doctor insights on:
What Does Negative Tb Test Look Like
Doc: Either your blood test igra is negative or your skin testing does not show any "bump". This should always be checked by a professional since even health care workers report false results. Best to check with a doc and not pa or np or nurse.
Mycobacterium tuberculosis is an infectious organism that spreads by droplets coughed out by an infected person. Infection is established initially in lungs, but can spread within lungs & to other body parts, or can become latent, with reactivation occurring years to decades later. With effective treatment, it can be completely eliminated although drug resistant ...Read more
TB Tests: I bet you could google image that question. A positive reaction is read after 48 hours from the test. It would be a raised redness greater than 5 mm in circumference.
Positive PPD test: A positive TB test should look like hard, raised bump with size >5to15 mm depending of the risk category you are in. It should be read in between 48 to72 hours. It is the hardness and not redness which is read. Thanks.
Skin test: If you had a PPD skin test and you have no risk factors, a positive test is when after 48 to 72 hoursyou have swelling in the site and redness that measures more than 15 mm, it is considered a positive tb. Test.
What is important: Is what it feels like - not how it looks. Induration is palpated & measured. Treatment (such as INH) is determined once it is established where this is latent or active TB and the type.
See below: A positive PPD is determined by the presence of swelling (induration) around the injection site. Little or no swelling indicates a negative test. Reddness is not used to determine a neg or pos test.
Last week I got a TB test (injection tues., read thurs.) results were negative, what does this indicate?
If I tested negative from a TB test and had been around someone who tested positive am I at risk of contracting tb?
TB risk: Yes, the PPD test is not 100%. You might want to get it repeated a month later to see if it is booster positive. Of course it is also possible that you didn't catch it. Many doctors are around people with TB a lot and never catch it.
I had my TB test read (negative) but just realized it had only been 45 hours, not 48. Is this still considered negative?
PPD: Yes it should be fine, it is most probably negative.See 1 more doctor answer
A positive: Tb test is associated with elevation you can feel at the injection site -- not likely to be a discrete bubble. Redness doesn't count -- you have to feel something.
Yes: If there is no raised area which measures at least 5 mm in diameter the test should be considered negative.
How long would it take for TB test marks to go away? Mine came back neg but the mark went from unremarkable to large and red after 4 days now. Thx.
TB Test: There can be several reasons why a TB test takes longer to reactt. If you do have a large reaction as you describe you should go back to your doctors office to show it to them as theymay decide it is a delayed positive test
Negative, give time: As long as there was no hardened lump at the infection site within that first 72 hours that was greater than 15mm (or less if you have risk factors), you are still considered negative. It can take some people up to a week or so for the redness and swelling to recede. Try ice several times a day to help with any swelling.
Hi, I recently had a TB test. It looks round and red but no bump. It was read as negative by nurse buy after 5 days, the redness is still there.
No bump = negative: A PPD TB skin test is where one needle injects a tiny amount of material under the skin. It is used to check for exposure to tb. The "bump" is measured, and any redness is not measured unless it is raised above the normal skin surface. A "bump" is positive if 5, 10, or 15mm, depending on the patient's circumstances. If positive or if worried, a blood test is done. Redness resolves in a week or so.See 1 more doctor answer
I got a tb test its itching and red. Size of a quarter maybe but it doesn't seem to be swollen. Pos? Neg?
Allergy to ppd: Some people get a 'reaction' like that to a ppd-but it's not indicative of a positive TB test-instead it's an allergy to the material used for the test. A doctor or trained professional can look at it and determine if it's positive based on 'firmness' (we call it induration) under the skin where the ppd was placed. Itchy and red skin is something else. If it's bad, some hydrocortisone cream helps
Took a TB test last monday & the nurse said it was negative on wednesday but now I have a red spot should I worry?
Not reversible: It is common for people to have some allergy to the components of the test medicine. The reaction for positive test is specifically the bump felt and not the redness. It will go away.See 1 more doctor answer
I am a medical assistant and had my TB test come back positive but cxr negative. Is there any follow up I should do?
Yes: For a person with a positive PPD skin test and a negative chest x-ray, if he had a BCG vaccine in the past, he can do a quantiferon TB blood test to see if he was exposed to real TB or just to the BCG shot. If he never had a bcg, he can talk with his doctor to decide if he should take inh prophylaxis against tb. If it is not sure if he truly truly was positive on the skin test, he can repeat it.
If I take Benadryl (diphenhydramine) a day after I got the TB test will it interfere with it? (make it positive/negative)
No effect: The reactivity of the tuberculin test relies on immune factors not allergic responses. Benedryl will have no effect on that process.See 1 more doctor answer
I have this cough for 10 months now, medical tests including TB test are all negative. Antibiotics didn't help either. Please what could be wrong?
Persistent cough?: You have had a persistent cough for ten months. If you are living with other human beings who do not have a similar cough you can be pretty confident that you don't have a very contagious condition. Think about cough secondary to post nasal drip, asthma, reflux. You should go see a pulmonary disease doctor. He will help you find out what's going on. Good luck.
Hi. I result with TB test positive. I'm taking medication. I did chest ray it comes negative. I'm worried about my doughter she comes positive to she is 5 years old. Please help.
Positive tb test: Your child should have a chest xray as well and then started on medicationSee 1 more doctor answer
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