Hi Lisa, and welcome!
“Nadir” means the lowest point in a curve. Since the impact of ProZinc usually lasts 10-12+ hours — as it takes effect, it lowers the BG number, and as it wears off, the number begins to come back up — a cat’s nadir will usually be between +5 hours and +7 hours after the injection. When we do a “curve” to see how the insulin is effecting the kitty over the course of the 12 hour shot cycle, we typically test every two hours. Since you’re starting out and testing is still tricky, you might try testing at +4 hours after the shot, then two hours later (+6 after the shot), then two hours later at +8.
We have personally not had good luck with using neosporin to get the blood to bead up, but last week, we started using a rice sock, and OMG what a difference...and Josie had always been a “good bleeder” we had thought! Using a rice sock to heat the ear makes a massive difference, and I highly highly recommend it.
Here’s what we do: we bought a pair of infant socks and put regular uncooked rice in them so that the sock of rice was maybe a little smaller than a golf ball. We did that with two of them. We put them in the microwave for 30 seconds (20 seconds if just heating one rice sock). When the rice sock is warmed up and she’s in her testing place, we put one of the warm rice socks against her ear on the inside and hold it there, gently rubbing the edge of her ear against the warm sock so that it heats up the ear. Meanwhile, we rub the other warm sock all around her face, jaw line, orbital bones, etc, just as a distraction, and she LOVES that. Who doesn’t want a warm facial massage?
We do that for about 20 seconds. We then do the test, and the blood has beaded right up with one tiny lancet prick every single time. We also use the rice sock during testing itself: we place a flat cotton round between the ear and the rice sock. It really helps to keep the ear steady and firm so that we can get a nice stick without the ear moving away from the lancet just due to the pressure of the lancet.
So I hope something like that will help, and in the meantime, please know that the ear *will* bleed more easily with every stick since the repeated sticks will cause kitty’s ear to form more capillaries.