Anyone have experience with reading an actual positive PPD? I ask because I'm about to start with a new employer and had my one step PPD on a Monday, read 48 hours later and no redness, swelling, or in duration. Two days later (96 hours since). I've got some mild reddening and swelling/induration at the site. I should first have mentioned that I had my annual test done July 25, read 72 hours later and was told it was positive with an induration >10 mm I questioned the first test as it was a new and very inexperienced MA who administered the ppd. My first thought was she went in too deep as it was more painful than usual...almost like an IM. Horrified with the result, I had a chest xray and right away left the outpatient clinic and went over to the dept of health and had one of the nurses examine my arm. She said that because she could not palpate a border edge on one side, she would score as a negative with 0mm induration...any who....chest xray negative....wasn't offered any further follow up. Week later, offered a position at a hospital, so had to do all the tests necessary with employee health...explained previous result and provided documentation and images..... so the RN checked with one of the hospitals infectious disease specialists, who also happens to be the director of my countys department of health, and got the okay from him to administer another one step. So here I am now (6 days since) with induration >5mm since yesterday..... is it possible to have a delayed response after 72 hours and be positive? I've googled this question over and over and can't find any definitive results.... I really wish someone could just give me a blood test. Any insight to this would be greatly appreciated!