You should test your blood or urine for ketones if:
- Your blood sugar rises unexpectedly, or if it’s over 250 mg/dl (13.9 mmol/l) for two consecutive tests.
- You experience symptoms like nausea, vomiting, confusion, or severe fatigue.
- You notice signs of ketoacidosis, such as increased thirst, frequent urination, stomachache, or dry mouth.
- You have an infection, flu, injury, or are feeling unwell.
- You’re planning to exercise but your blood sugar is over 250 mg/dl.
- If you’re pregnant, check for ketones each morning before breakfast or whenever your blood glucose exceeds 250 mg/dl.
