I would call your doctor's office for specific instructions. My instructions from the Mayo Clinic read:
Special directions for patients with diabetes
Day before exam
For patients taking insulin:
-Take half you usual dose of regular, NPH or Lente insulin in the morning.
-DO NOT take any insulin in the evening.
For patients taking oral medicines:
-Take only one-half of you usual medicine in the morning
-DO NOT take oral medicine in the evening
Day of your exam
For patients taking insulin:
-Check your blood sugar. DO NOT take morning insulin.
-After the exam, if you are eating, take one-half of your NPH or Lente insulin. DO NOT take any regular insulin.
-Take your normal does of insulin in the evening if you are eating.
For patients taking oral medicines:
-DO NOT take oral medicine for diabetes in the evening before your exam.
-After the exam, if you are eating, take only one-half of your usual oral medicine.
-In the evening, take normal dose of oral medicine if you are eating.
If you take Ultralente insulin or use and
insulin pump, contact your physician or diabetes educator.
If you check your blood sugar daily, check it more often the day before you exam and the day of your exam.
If you have a low blood sugar during the prep, you may take fruit juice, regular soda, or
glucose tablets or gel.
PLEASE REMEMBER, CONTACT YOUR OWN PHYSICIAN WITH ANY QUESTIONS.
Best of luck.
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