Is it ok to use expired diabetic test strips?

No. Expired test strips may give inaccurate results. Do not use test strips if the expiration date has passed. Test strips are only good for 3 months after opening the vial. When opening a new vial count forward 90 days and write that date on the vial. Throw away any remaining test strips after that date. What out for low priced Test Strips, usually on Ebay. Many times they have expired.