If your cat is testing in low numbers and you are not getting a quick response to your post, there are several things you need to do. (Low numbers are under 50mg/dL or 2.8 mmol/L.)
Depending on how carbohydrate sensitive your cat is, feed approximately a teaspoon or less of food with high carb (HC) gravy or HC food only. (If you have a cat with GI issues, using syrup plus LC food is an alternative.)
Test again in 15 – 20 min. Depending on the numbers, give more HC food.
Repeat the above steps every 15 – 20 min. until your cat tests in the 50 mg/dL (2.8 mmol/L) or above range for 2 consecutive tests. Continue to feed in small amounts to keep numbers in a safe range.
Test in 30 - 40 min. and repeat the test and feed process until there are 2 consecutive tests where numbers are stable or rising.
Test in an hour and follow the same steps.