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Doctor insights on: Positive Skin Tb Test

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

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

Exercise Stress Test (Definition)

Recording an ekg while walking up a steeper & steeper incline, at a faster & faster rate, so as to increase heart contraction intensity & rate of contraction, thus blood flow needed by the heart muscle. However, atherosclerosis does not narrow arteries, clots do, & the ekg only detects major qualitative differences in capillary blood flow. Thus only severe artery disease ...Read more


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

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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If a person had TB as child and underwent treatment for it, could he have a false positive TB skin test as an adult?

Yes: Once you had a positive PPD test, it will stay positive whole your life. Chest x-ray, what you need to do every few years. ...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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Is it okay to donate blood if i had a positive TB skin test but negative chest x-ray?

Is it okay to donate blood if i had a positive TB skin test but negative chest x-ray?

Positive skin test: You can donate blood as long as you dont have active tb. ...Read more

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Tested positive for TB skin test in the past, and was given TB skin test to recheck, now have the reaction on both arms. Doc was told she tested +.

Positive : If the TB skin reaction site is firm and raised and is over 15 mm in diameter in an otherwise healthy adult, it is considered a positive reaction and requires treatment. Please see an infectious disease doctor or primary care physician to discuss treatment options. ...Read more

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Always had positive TB skin test last chest X-ray 5 yrs ago now have supraclavicular swelling after prednisone/cortisone possible tb? What to ask dr

Always had positive TB skin test last chest X-ray 5 yrs ago now have supraclavicular swelling after prednisone/cortisone possible tb? What to ask dr

Ask when next appt?: This could be tb, but might be one of several other infectious, musculo-skeletal, or related conditions. It needs examined by a doctor, soon. Questions the provider asks should help direct yours beyond just "what is it?" initial cxr or ct scan will likely yield more information to base questions (and treatment, if needed) on. ...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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What can be done to determine if you have positive result for TB skin test?

What can be done to determine if you have positive result for TB skin test?

Different cutoffs: Positive result for TB skin test is based on the size of the swelling (induration) at the site of TB test & additional risk factors that you have for acquiring tb. There are 3 cut offs for determining positive result (5, 10 & 15mm) & each one has different criteria for being used as cutoff for your test. Talk to your doctor to find out whether your test is positive or not based on these factors. ...Read more

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Exactly how long after receiving the BCG vaccine will I need to wait before testing positive in the TB skin test?

3-6 weeks: You may or may not test positive, but should wait about 6 weeks before testing. ...Read more

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If you were going to have a bad reaction (not a positive reaction) to a TB test (under the skin) would it happen right away or can it take days?

If you were going to have a bad reaction (not a positive reaction) to a TB test (under the skin) would it happen right away or can it take days?

1 to 3 days: It can take 1 to 3 days to get to its worst. This is for some people that have reactions after they have a positive test. If you are referring to a type of allergic reaction, this usually be almost right away. ...Read more

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What should my skin look like after taking a TB test?

What should my skin look like after taking a TB test?

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. ...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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Tuberculosis vaccinated, TB test positive...Will my ANA be positive because of TB test positive due to vaccine?

Tuberculosis vaccinated, TB test positive...Will my ANA be positive because of TB test positive due to vaccine?

No: There is no cross reaction between them. By the way, up to 5% of normal individuals may test positive to ANA test, usually at low titer. ...Read more

H. Pylori Breath Test (Definition)

H.Pylori urea breath test is used to detect the presence of h.Pylori in the stomach. If present it acts on urea and releases carbon die oxide (co2)and ammonia. The released co2 is measured, and the presence of h.Pylori is confirmed. It is a useful test conducted in about 15 minutes. The sensitivity and specificity of ubt are approximately 88 to 95 percent and 95 ...Read more


Dr. Scott Lindquist
632 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