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A member asked:

What constitutes a 2-step tst?

4 doctors weighed in across 4 answers
Dr. Jackie Lam answered

Specializes in Family Medicine

PPD: 2 step tst is bascially having a second PPD test repeated within 1 month of the first ppd.

Answered 9/28/2016

6.1k views

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The CDC knows!: Here is a great page from the cdc that has all the information you need: http://www.Cdc.Gov/tb/publications/ltbi/diagnosis.Htm.

Answered 11/12/2012

5.5k views

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Dr. Klaus d Lessnau answered

Specializes in Pulmonary Critical Care

Museum of History: Two skin tests now replaced with one simple blood test - igra.

Answered 1/5/2019

5.5k views

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A 2 step TST is: Serial tests 2 weeks apart. This short interval implies an old positive test and not a skin test conversion.

Answered 11/19/2012

5.5k views

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