5 doctors weighed in:
If I got a PPD shot in august 2011, how long are the results valid?
5 doctors weighed in

Dr. Mark Diamond
Pediatrics
2 doctors agree
In brief: Depends
The PPD asseses whether you have had a TB infection.
If not, and you are infected tomorrow your test will change to positive after a period of time. So the test is only good the day it is done.

In brief: Depends
The PPD asseses whether you have had a TB infection.
If not, and you are infected tomorrow your test will change to positive after a period of time. So the test is only good the day it is done.
Dr. Mark Diamond
Dr. Mark Diamond
Thank
Garrett Caldwell
Family Medicine
1 doctor agrees
In brief: PPD
Ppd is a one or two step test for past exposure to tuberculosis.
Results are typically good for 1 year, however you only need them if someone requires you to have the test (school, work, etc.) a positive test does not indicate you have an active TB infection, just that you have been exposed to the organism in the past.

In brief: PPD
Ppd is a one or two step test for past exposure to tuberculosis.
Results are typically good for 1 year, however you only need them if someone requires you to have the test (school, work, etc.) a positive test does not indicate you have an active TB infection, just that you have been exposed to the organism in the past.
Garrett Caldwell
Garrett Caldwell
Answer assisted by Garrett Caldwell, Medical Student
Thank
1 comment
Dr. Klaus d Lessnau
Outdated and should be in the museum. Overused and waste of health care resources. IGRA blood testing is better and more accurate. It is good forever until you have symptoms that suggest tuberculosis.
Get help from a real doctor now
Dr. Aaron Milstone
Board Certified, Internal Medicine - Pulmonology
23 years in practice
1M people helped
Continue
108,000 doctors available
Read more answers from doctors