Sometimes a lower-than-normal PS is just a quirky cycle, and you can give the regular dose even though it's a little low. Sometimes even if it's quirky, you still need to lower a little bit. Sometimes a lower-than-normal PS indicates that the cat needs a reduction in insulin regularly, not just for that cycle. Sometimes the cat is moving down the dosing scale and that number would be a NS because the cat's reactions are too dramatic. All of those things are dependent on seeing what "normal" PS and mid-cycle numbers are looking like in the week or so leading up to it so we can figure out which situation it is (keep the dose, lower the dose, temporarily lower the dose, or skip the shot).