Is it possible for my cholesterol to go up 27 points in less than a week?

Since my gastric bypass, I now have to get quarterly blood work done.

In July, my total cholesterol was 164. Last week, I had my annual biometric screening for my health insurance discount. They do a finger stick and get the results in about 1–2 minutes, and it said my cholesterol was 163. Incidentally, I was not fasting for that result.

On Saturday, I had my quarterly blood work drawn… fasting for 12 hours… and it said my cholesterol was 190. And it said my LDL was 118, whereas the results from the week prior said it was 100.

Granted, I know the finger stick could have been inaccurate… but I am inclined to believe it WAS simply because it was only a point off from my July result. That would be a pretty huge coincidence. Also, fasting should produce my lowest result, and it produced my highest? And such a huge jump?

Any thoughts on this?