Table 10.

When to measure urine or blood ketones.

•When BG is unexpectedly high; e.g., fasting ≥250 mg/dL or unexpectedly ≥300 mg/dL for more than 2–3 h • During intercurrent illness irrespective of BG concentration • With nausea, vomiting, abdominal pain • Patients using SGLT inhibitors whenever they experience malaise or nausea despite normal or only mildly elevated BG levels • Patients using an insulin pump whenever there is unexplained hyperglycemia, which may indicate failure of insulin delivery