Punctual blood samples
The term punctual blood samples applies when a limited number of blood samples are taken at different intervals during the day. A regular glucose curve requires blood sampling every 2 hours for a period of 12 to 24 hours.
When should punctual blood samples be taken?
The first blood sample should be taken early in the morning prior to the first meal and insulin injection. The second blood sample should be taken approximately 7.5 hours later. When a rapid metabolism is suspected, it can be taken earlier. If the cat receives insulin injections twice a day, blood sampling should be done before each meal.
If slight hypoglycemia or hyperglycemia is detected, but all other parameters (ie, urine, appetite, water uptake, general condition) suggest improvement and stability, the insulin dose most likely is appropriate as is. To be certain, repeat the tests the next day. If the results confirm that there is reason for concern, perform a serial blood glucose curve before adjusting the insulin dose.
Caution: It can be impossible to differentiate a Somogyi overswing from rapid metabolism or resistance to insulin with only a few blood samples.