I was like that at first worried about the number diff, but high is high and low is low, I found that when my vet regulated my cat he was giving way to much, I am much happier doing the curve myself at home where my cat is not stressed and then getting advice on here about the units, bella started out on to high of a dose and that dosage came from the vet, we have went down a lot from the 4u he started out on, guess what I’m saying is u can do a curve at home and do daily testing and I don’t know if your cat stresses from vet which will up his BG, mine does, so I’m more comfortable doing it here at home and then getting suggestions of dosage from here, so beginning at 4u, spending 100 a month on strips, now down to .25 to .50u and spending 18.00 a month for 100 strips