Can ppl read their own PPD?

It is too important not to have a nurse confirm the result. Even if the subject is a nurse, a second opinion is appropriate for documentation purposes if nothing else.

No lay person should read their own TB skin test. They don't have the knowledge or the background to know what is normal and what is not. I read my own TB skin test at home over the weekend when I had been required to get it done immediately due a known exposure several weeks before that was just confirmed. Well, it was grossly positive. Even I, a trained nurse, had wondered what was going on with the redness on my arm because I had forgotten about the test. Then the lightbulb came on and I realized what it was. A layperson could have chalked it up to a bug bite or a reaction to some other substance, especially if it was as large as mine was - nearly my entire forearm.