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Doctor insights on: Negative Tb Skin Test Pictures

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What does it mean if I have a negative TB skin test yet a positive blood one?

What does it mean if I have a negative TB skin test yet a positive blood one?

IMMUNE PROBLEM: Both tests detect prior exposure to TB. A situation of diminished immune function, called anergy, can make the skin test appear negative. If you have a positive blood test you will need to have a CXR to exclude active infection and may need prophylaxis . ...Read more

Dr. Scott Lindquist
615 doctors shared insights

Mycobacterium Tuberculosis Infection (Definition)

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


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My previous TB skin test was negative while current is positive. How is this possible?

My previous TB skin test was negative while current is positive. How is this possible?

True of false: This could be a true or false positive, and your doc should sort that out. People can be exposed to TB in the activities of their daily lives, and pick up a latent TB.In med school it was common for students to convert from - to + over a their time in training.You will need more testing, an may or may not need meds. ...Read more

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What do you suggest if my previous TB skin test while negative while current is positive?

What do you suggest if my previous TB skin test while negative while current is positive?

Need care!: Your TB test has turned positive - this is very significant. The guidelines are very clear what needs to happen now with further diagnostic studies, including chest x-ray, and then treatment. If your primary care doctor is not comfortable caring for TB, see infectious disease or pulmonary specialist ASAP to begin evaluation and care. There are great ones in Columbus area - call for appointment now ...Read more

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If I had a positive TB skin test but a negative xray do I need medication? My doctor didn't say I did

If I had a positive TB skin test but a negative xray do I need medication? My doctor didn't say I did

Positive PPD: If you have a positive tuberculin test and a negative chest xray many doctors will oder a sputum culture. If you have a positive sputum treatment is indicated. However, many doctors will treat prophylactically with isoniazid for protection ...Read more

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I just had a TB skin test done last week and i had it read and they said it was negative however i still have a little red bump how do I get rid of it?

PPD Test: You likely get a small skin reaction to TB test that is not large enough to be called positive in your case. It is a type of delayed hypersensitivity reaction due to immune cell infiltration and inflammation. You can put otc cortisone cream on the lesion 2-3 times a day to make it go away faster. ...Read more

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Tb skin test negative, quentform TB test negative, bone marrow biopsy results indicative of TB (reacts to ziehl niehlssen), PCR negative. How come?

No...actually: The zn stain is a broad stain for acid fast bacilli of which mycobacterium tuberculosis is one of many. The specific tests like quantiferon or the pcr test are against you having tb. The culture is the "gold standard" but you will need to wait for it. It might turn out be a cousin of TB and that too will grow out of culture. Stay on TB meds until they are certain of the AFB positive organism. ...Read more

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TB skin test done this AM.It is red with 1/2in induration. Woke up feeling bad,Weak,no fever, strep test neg., sore throat. Side effect of test?

Unlikely: You likely have a cold and the Tb test is incidental. The test agent is not live and thus should not cause any systemic symptoms. ...Read more

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Are there any age restrictions for the TB skin test?

Not aware of any: But with advancing age, the response to the skin test may be falsely negative. There are newer tests available which work by assessing the lymphocytes capacity to respond to antigenic stimulation by a component of the tubercle bacillus, but whether this differs in age groups I do not know. ...Read more

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Is it normal that a TB skin test causes bleeding a lot?

Is it normal that a TB skin test causes bleeding a lot?

No but....: No, but may occur if the administration of the test is traumatic. Also may happen if you are taking medicine that has an anticoagulant effect, such as daily aspirin.Or if you have a bleeding problem. ...Read more

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What happens if you scratch or sleep on a TB skin test?

What happens if you scratch or sleep on a TB skin test?

Nothing will happen: Nothing will happen with either of those things. The TB test helps determine if you have ever been exposed to the TB bug & whether your immune system (specifically your t cells) has been primed against this bug. The test is read within 48-72 hours after being given & will help determine if you have been exposed or not. Further testing is required after a positive test. ...Read more

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Found out TB skin test positive and stressed please help?

Found out TB skin test positive and stressed please help?

Don't be: Don't be stressed. You need a chest x-ray and a screening by your doctor. At your age, if your chest x-ray is normal and you have no risk factors you may not need any treatment. If you have risk factors, treatment of latent TB has become much easier in the last year. If you are determined to have active TB you can be cured with 6 months of TB therapy. ...Read more

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Why is my TB skin test site still irritated after 72 hours?

Why is my TB skin test site still irritated after 72 hours?

PPD: The result of PPD testing is read within 48 to 72 hours. If the test turned positive, the bump can persist for many days. ...Read more

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When taking a TB skin test, will the bubble on your skin go away?

When taking a TB skin test, will the bubble on your skin go away?

Tuberculin test: Yes, within 2 - 3 days if negative. Longer if positive. ...Read more

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A red like a bite of mosquito, is it considered positive for TB skin test?

Swelling important..: Redness is not important, but induration (swelling) is when reading a TB test. For normal healthy person, induration of > 15 mm is considered positive. Other clinical situations may warrant calling >10 mm of induration positive. ...Read more

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How to know what is being injected inside of you when you take a TB skin test?

Protein extract: Tb skin test utilises proteins that are normally present in the cell wall of the TB bacterium. They are extracted from killed bugs in the laboratory & further purified to extract small components of these TB proteins that our body's immune cells are able to recognize. If exposed to tb, previously primed immune cells move to site of injection on forearm causing swelling & thus a positive reaction. ...Read more

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How long is it supposed to it take for the bump from my TB skin test to go away?

Days to weeks: It can sometimes take several days to a couple of weeks for the swelling to subside after the TB test. This is more likely to happen if you had a strongly positive test result with a significantly large area of swelling (induration). ...Read more

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I got a TB skin test today and the site is red and puffy. It does not itch or anything. Is it positive?

Too early to tell: The TB skin test needs to be looked at 48-72 hours after it was placed. Redness at 24 hours does not mean anything. The swelling (induration in medical language) is what your provider will be looking at. ...Read more

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How often do u need get TB skin test? I start class in Nov. so is it too early get it done? Should I wait until Nov?

How often do u need get TB skin test? I start class in Nov. so is it too early get it done? Should I wait until Nov?

TB skin test...: A TB skin test is typically done early so getting it done now for a class beginning in November should be ok. But, check with your school to be sure before getting it done! ...Read more

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Can induration on TB skin test be deep?

No: Induration produced by TB skin test is a raised bump. ...Read more

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Can a TB skin test be read 24 hours later?

No: It is recommended to wait for at least 48 hours before interpreting the size of the swelling arising at the site of the TB test. This is because the swelling continues to increase for the first 48 hours & that is how this test has been standardized. Please make sure that you do not get your test done on a thursday, so the 48 hours time point won't come over a weekend. ...Read more

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Can i take a shower while doing a TB skin test?

Can i take a shower while doing a TB skin test?

Yes: Your normal bathing habits will not have any effect on the test & your friends will appreciate it. ...Read more

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After how many days does a TB skin test disappear?

3-5 days: The peak reaction usually occurs in the first 2-3 days. Most will resolve within 5 days. This can vary depending on the size of the initial reaction. ...Read more

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How frequently should I get two-steps TB skin test?

Not frequently: Unless you are exposed in your job or it is needed for your job. Some health care workers get it yearly. ...Read more

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What to do if I have a positive on my TB skin test?

Seek out information: Most will be followed first with a chest x-ray looking for active pulmonary disease. If negative, you are likely started on one TB drug, depending on your local as treatment for latent (quiet) tb. If you are found to have active tb, you are likely started on a 4 drug program that lasts for up to a year to knock it out. Get with your doc to see. ...Read more

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Can a person acquire an immunity to the TB skin test?

Can a person acquire an immunity to the TB skin test?

No: Fortunately not or we would not be able to perform this test on more than one occasion. ...Read more

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Could a positive TB skin test mean you always have tb?

POSITIVE PPD: NO. Sometimes it is due to immunization given before. Take a chest x-Ray to find any lesion in the lungs. ...Read more

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Where should I go to get a TB skin test and a physical?

Tuberculin test: If you need both physical examination and a tuberculin test, go to a primary carea provider. ...Read more

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If my Tb skin test came back positive, should I be worried?

If my Tb skin test came back positive, should I be worried?

Positive PPD: A positive TB skin test should be followed up with a chest xray. If both are positive for findings, one should be treated and followed by an infectious disease specialist and take medications. False positive skin tests can occur if previously vaccinated against TBor infected with TB-like organisms. Improper technique or interpretation of reaction are other causes of false positives. ...Read more

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Should i concerned that my TB skin test came back positive?

Not really: It does mean your have been exposed and will need treatment to prevent it from worsening TB is a very slow growing germ... I would also suggest consulting a chinese medicine practitioner as many herbs are very helpful in helping the body heal itself.... ...Read more

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If I have a positive TB skin test, does that mean I have tb?

Not necessarily: (+) PPD means that you have been exposed to the TB agent. It doesn't say when. So if you had the TB in the past, it still will be (+) because your body "remembers" from the previous exposure. The greatest risk is if the TB agents are latent in your body, that's why everyone with a (+) PPD will have either a complete treatment with 4 medications or a mild one with only one. Your PPD will remain (+). ...Read more

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Can a TB skin test be positive if person had TB in the past?

Yes: Exception will be the ones who had a latent TB and received a prophylactic inh treatment for 9 months. Their reaction to tuberculin test can become negative. ...Read more

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What is a TB skin test and what are the procedures (injection)?

Skin test: It is a liquid (purified protein derivative) that is injected under the skin on the forearm (the ventral side or underside of the forearm) as a bleb that goes away. It tests to see if you were exposed to tb. When it is positive there is an indurated (raised and red) reaction bigger than a dime. It has to be read 2 days after it is done. ...Read more

Dr. Klaus d Lessnau
1,215 doctors shared insights

Tuberculosis (Definition)

A potentially serious infectious bacterial disease that mainly affects the lungs, but can ...Read more