Question 1

what does a negative ppd test look like?

Accepted Answer

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.

Question 2

what's the difference between a positive and negative ppd test?

Accepted Answer

PPD: Positive test: 5mm in HIV patients and other immunosuppressed individuals
all others: 10 mm .Measured induration after 48 hours.
Negative reaction: not exposed to tb.

Question 3

is it possible to have tb after a negative ppd test?

Accepted Answer

PPD testing: The answer is yes. A previous exposure to TB (travel to a country where TB is endemic) can result with a negative PPD test before the germs produce disease. Have yourself retested in 8 to 10 weeks if still suspicious or opt for the blood test, quantiferon.

Question 4

ppd skin test, negative, no reaction and swelling (72 hrs). the test was taken in last tuesday morning, 9am, now it gets swelling and itch. positive?

Accepted Answer

Delayed onset ppd: This could represent a positive reaction. Their is a besst confirmatory test called a quantiferon-gold test which is a gamma-interferon release assay for tb. It has some limitations but if positive is very accurate for diagnosis, ask an infectious disease specialist about this if your pcp does not know about this test.

Question 5

i got a tb/ppd test on monday, and got my test read on wednesday, but the results were negative and didn't see a sign of a reaction that day. that thursday, i saw that i had what look like a bruise. is there any way that it was a mistake, and i actua?

Accepted Answer

About PPD tests: A PPD skin test reaction is read between 48 and 72 hours after administration. The reaction should be measured in millimeters. The part that is measured is the induration (palpable, raised, firm area or swelling). If there is no raised skin that one can FEEL without looking at it, then there is nothing to measure (the result gets written as 0 mm). Each patient's situational details also matter.

Question 6

help!! whats wrong with me? got a ppd test done came back positive, got xray and blood test done came back negative for tb and negative for stds. what other than std or tb can cause positive test ? can anyone give a detailed answer?

Accepted Answer

: A PPD skin test is falsely positive up to ~2% of the time. Common causes include misinterpretation, BCG vaccine as an infant (not done in the US) and infection my non-TB members of the mycobacteria family which are often minor. This is a relatively cheep screening tool, compared to the IGRA blood test that is more accurate. The testing you had says you are fine. I wouldn't worry about it.

Question 7

xray shown tb positve. ppd test positive but sputum negative.  since i show no symptoms like fever, cough, night sweats etc., is it latent or active?

Accepted Answer

TB: When your x-ray was read the radiolgist must have commented whether or not TB is active. The radiologic signs of active and inactive TB are different.

Question 8

i just had a ppd test done and ilittle bit unwell afterward?

Accepted Answer

Unusual: But some people may develop malaise because of the thought of the test, or the immune reaction may precipitate some low grade symptoms, or there may be allergic reactions to material in the PPD preparation.

Question 9

what's done for a positive ppd test?

Accepted Answer

Depends: That depends on your age, other health conditions, and whether you recently went from having a negative PPD to a positive one.  In some cases, we treat with a 9 month course of isoniazid, or a shorter course of Isoniazid and rifapentine, to eliminate the latent bacteria.

Question 10

what does a positive ppd test feel like?

Accepted Answer

Firmness: The diameter of the circle of hardened skin at the site of the PPD is measured, and depending upon who you are, what underlying diseases you may have, what medications you are taking, it is read in 48 hrs.  Do not measure the area of redness, only the area of firmness (induration).  Otherwise there are seldom other symptoms.

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Doctor answers about:

Negative PPD test pictures

A member asked:

What does a negative ppd test look like?

A member asked:

What's the difference between a positive and negative ppd test?

A member asked:

Is it possible to have tb after a negative ppd test?

A member asked:

Ppd skin test, negative, no reaction and swelling (72 hrs). the test was taken in last tuesday morning, 9am, now it gets swelling and itch. positive?

A member asked:

I got a tb/ppd test on monday, and got my test read on wednesday, but the results were negative and didn't see a sign of a reaction that day. that thursday, i saw that i had what look like a bruise. is there any way that it was a mistake, and i actua?

A member asked:

Help!! whats wrong with me? got a ppd test done came back positive, got xray and blood test done came back negative for tb and negative for stds. what other than std or tb can cause positive test ? can anyone give a detailed answer?

A member asked:

Xray shown tb positve. ppd test positive but sputum negative. since i show no symptoms like fever, cough, night sweats etc., is it latent or active?

A member asked:

I just had a ppd test done and ilittle bit unwell afterward?

A member asked:

What's done for a positive ppd test?

A member asked:

What does a positive ppd test feel like?

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