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PPD question

Discussion in 'Medical Students - MD' started by PACmatthew, May 20, 2002.

  1. PACmatthew

    PACmatthew Senior Member
    7+ Year Member

    Feb 27, 2002
    Likes Received:
    This is to any nurse who deals with PPD readings and really knows their stuff. Do you know if having a PPD done within a month of your last one can lead to a false positive, or simply a larger reaction? I had a patient who I diagnosed with TB, active, and I had been around her for a few times trying to fix her cough before I diagnosed the TB. Coincidentally, I had done my annual PPD the week before, and it was negative. Now, one and one half months later, I am 24 hours into my PPD and my arm has some slightly significantg erythema. I know I need to wait until the 48-72 hour mark, but I am concerned because my last test did not even leave any redness. I seem to recall that there is some sort of problem with giving them too close together. Does anyone really know, and can you give a link to reference? I have also heard that there can be a little redness at the 24 hour mark from the injection, but I didn't have any last time. I don't think I feel any induration right now, but I am getting nervous. Any insight will be appreciated. Thanks.

    Matt, PA-C
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  2. Rads

    Rads Member
    7+ Year Member

    Apr 21, 2002
    Likes Received:
    A little "redness" does not signify a positive PPD, measure the area of induration. If it is greater than 10mm, you have a positive test.

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