Emergency Department Presentation Thresholds for Hyperglycemia

Immediate Emergency Evaluation Required

Patients should present to the emergency department when blood glucose exceeds 250 mg/dL for two consecutive days, or immediately when glucose is ≥180 mg/dL with symptoms of severe hyperglycemia, according to the American Diabetes Association guidelines 1
Blood glucose ≥180 mg/dL with symptoms such as vomiting, dehydration, or altered mental status requires immediate ED presentation, as recommended by the American Diabetes Association 1
Severe illness or acute medical condition with blood glucose ≥180 mg/dL warrants immediate ED evaluation, as stated by the Diabetes Care guidelines 2
Blood glucose ≥250 mg/dL persistently over 2 consecutive days, even without symptoms, requires emergency department evaluation, according to the American Diabetes Association guidelines 1
Any glucose reading too high for home glucometer to measure (typically >600 mg/dL) necessitates immediate ED presentation, as recommended by the American Diabetes Association 1
Signs of diabetic ketoacidosis (DKA), such as plasma glucose ≥250 mg/dL with arterial pH <7.30 and bicarbonate <15 mEq/L, require immediate emergency evaluation, as stated by the Diabetes Care guidelines 2
Signs of hyperosmolar hyperglycemic state (HHS), including blood glucose ≥600 mg/dL and impaired mental status or altered consciousness, warrant immediate ED presentation, according to the Diabetes Care guidelines 2, 4

Youth with Type 2 Diabetes should seek immediate evaluation if blood glucose ≥250 mg/dL with symptoms, as recommended by the Diabetes Care guidelines 4
Pregnant individuals with any concern for DKA require immediate medical attention due to significant feto-maternal harm risk, as stated by the Diabetes Care guidelines 3
Patients on SGLT2 inhibitors with glucose >200 mg/dL and ketones present should prompt immediate evaluation, as recommended by the Diabetes Care guidelines 3

Patients may attempt home management if glucose >200 mg/dL with mild symptoms, but only if they are hemodynamically stable, cognitively intact, and able to tolerate oral hydration, as stated by the Diabetes Care guidelines 2
Home management requires the ability to administer subcutaneous insulin, perform frequent blood glucose and ketone monitoring, and have access to diabetes care team support, as recommended by the Diabetes Care guidelines 1, 5

Correctional and institutional settings should implement policies requiring physician notification for blood glucose <50 mg/dL or >350 mg/dL, as stated by the Diabetes Care guidelines 5

Do not dismiss glucose >200 mg/dL in patients with symptoms, even if they have chronic poor control, as this may represent acute decompensation, as recommended by the Diabetes Care guidelines 3
Do not wait for classic DKA symptoms in pregnant patients, as presentation may be atypical with euglycemic DKA, as stated by the Diabetes Care guidelines 3
Do not assume patients on SGLT2 inhibitors are safe from DKA if glucose is <250 mg/dL, as euglycemic DKA can occur, as recommended by the Diabetes Care guidelines 3