If it helps, the JAR blood test that I had wasn't really a 'jab' at all. Some sort of very small spring loaded needle went into the side of one fingertip and a drop or two of blood was smeared onto a paper testing strip. Not that I have any problem with needles etc, but the doc did it while I was being distracted by the nurse rubbing the electrically-conductive jelly into my chest for the ECG sensors. Too busy trying not to get a hard on to worry about the blood test!