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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
613 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

Dr. Klaus d Lessnau
1,212 doctors shared insights

Tuberculosis (Definition)

A potentially serious infectious bacterial disease that ...Read more