When should I check my blood or urine for ketones?

You should test your blood or urine for ketones whenever:

• There is an unexplained rise in your blood sugar, or you have a blood sugar level of more than 250 mg/dl (13.9 mmol/l) for two tests in a row;

• You have symptoms of nausea, vomiting, confusion, or severe fatigue;

• You have any symptoms of ketoacidosis such as increased thirst and urination, stomachache, or dry mouth;

• If you have a flu, infection, or injury;

• When you’re planning to exercise, but your blood sugar is over 250 mg/dl.

• If you are pregnant, check for ketones each morning before breakfast or whenever your glucose goes over 250 mg/dl.