Reading the PPD

[@bybrum]

For people vaccinated with BCG, it may turn out that the person's result for this test is positive but it does not necessarily mean that the person has TB. This happened with my son who had BCG at birth. His PPD test turned out positive and the doctor advised us to let him undergo a second test, QuantiFERON-TB Gold test (QFT-G) to confirm if he really has TB. It turned out that he is negative of TB and the positive PPD result is due to his BCG vaccine at birth. This an example of a false positive.

[@aravindsondur2379]

Sir quantiferon gold test detects tb antibodies and when a child is vaccinated with BCG then there are good chances that quantiferon gold test could turn positive ? Because vaccinations trigger our immune systems to produce antibodies! Please correct me if iam wrong.

[@yaraelhefnawi7632]

ugh THANK YOU yknow when you're exam is in less than a month and you just can't swallow any more new info and then you come across this gracious save :'l

[@aliceyan4500]

I live in China, which is an endemic country. And I took the PPD test the day before yesterday. The result was 9*7mm. It was considered positive by doctors in China because any induration that is larger than 5*5mm is regarded as positive there. I was really panic to the result until I saw this video. I think I fall into the Medium-risk category so I should be considered as negative according to the US criteria. Besides, I received BCG vaccination when I was a baby. I bet the BCG somewhat contributed to my induration. In all, thanks very much for making this video! It really makes feel much better.

[@meggustafson8268]

Awesome teaching skills! Visual and personal and the lay up from the ground up...WOW! You have rocked this. thank you for being such an incredible teacher.

[@egantrucking]

This guy is the TB God! Nice job, again!

[@nephatoliech5601]

TB God!!! ha ha ha ha ha I like that

[@МарияЛуговая-т5ц]

This was very interesting. In Russia we always consider PPD positive when induration is above 5mm. And we always take into account previous BCG vaccination to distinguish between vaccinal allergy and bacterial allergy.

[@alfredjohn6581]

How about exactly 0.5mm? Is it positive or negative?

[@lamaaldosari7835]

Can anyone explain to me why 5mm bump is not considered positive for people with low and medium risk??

[@docshaheen6741]

fantastic, thanks doc

[@notapplicable2636]

Just had a TB test earlier today. What if there is no induration whatsoever..? Also how long would it take for said induration to occur..?

[@68sagandeepkaur13]

No induration and just redness means ur negative for TB.......it takes 2-3 days for induration to develop in positive case

[@michaellacruz6831]

I had a ppd skin test yesterday as the doctor suspected that I have tb. Its my first day today and need to wait until tomorrow/sunday for the result. I'am so scared to know the result, tbh. :( I have a bruise in the site where I got the injection and somewhat kinda reddish and just small. Is the bruise be counted as positive?

[@luckylondon8291]

What you did once you got positive ?

[@MedicalSkillsTraining]

I was taught 10 mm -15mm is positive- but if they’ve been on TB antibiotic therapy and it’s 10-15 mm- it’s negative.Or if they had the BCG injection - they’re negative as well even with duration above 10mm. A chest X-ray and sx’s must be take Into consideration -

[@paislife]

What if as a child the patient had primary complex and ten or eleven years later this child takes a ppd because this child was in contact with a patient with active tb

[@bansaripatel9896]

What is “two- step” tuberculin skin testing ?And when is it done?

[@WayneAnatomy]

I had my BCG vaccination when I was a baby. Now I am 23 years old and required to do the TB test and TB antibodies test. What result should I get? Which result should indicate I should take BCG vaccination again or a booster dose? I also heard that BCG vaccination only valid for 20 years. Is that true?

[@МарияЛуговая-т5ц]

There is also another allergy skin test called Diaskin. It was made to help in differential diagnosis between vaccinal and bacterial allergy. In Russia all newborns get BCG vaccination and react positive to Mantoux skin test. After 18yrs we use CXR.

[@منىحسن-ب4ي]

Awesome thanx alot

[@luckylondon8291]

I am nursing student … when I did this Test I got postive …. What does mean now … can I continue my nursing or no

[@sumandeepkaur8289]

If someone got BCG vaccine what to do with them plz explain.

[@drkhalidafmdc6976]

P

[@frisbeeking7002]

very bad sound, very chaotic explanations. not cool.