Target Premeal Glucose Levels for Patients on Insulin Therapy

Target Glucose Levels by Patient Population

The American Diabetes Association recommends a premeal capillary plasma glucose target of 80-130 mg/dL (4.4-7.2 mmol/L) for most non-pregnant adults with diabetes on insulin therapy 1, 2, 3
For non-pregnant adults with diabetes, the peak postprandial target is <180 mg/dL (<10.0 mmol/L) 1, 4
Postprandial measurements should be taken 1-2 hours after beginning a meal 2, 4
For non-critically ill hospitalized patients, the premeal glucose target is <140 mg/dL (7.8 mmol/L) with random glucose <180 mg/dL (10.0 mmol/L) 5, 6, 7
For critically ill patients, the target glucose range is 140-180 mg/dL (7.8-10.0 mmol/L) when on intravenous insulin 5, 6, 7

Glycemic targets may need adjustment based on duration of diabetes, age and life expectancy, comorbid conditions, known cardiovascular disease or advanced microvascular complications, and hypoglycemia unawareness or history of severe hypoglycemia 1, 2

Hypoglycemia is defined as any blood glucose <70 mg/dL (3.9 mmol/L) 5, 7
Early recognition and treatment of mild to moderate hypoglycemia (40-69 mg/dL) can prevent progression to severe episodes 5, 7
The American Diabetes Association recommends treating hypoglycemia with fast-acting carbohydrates when glucose is ≤70 mg/dL (3.9 mmol/L) 1, 4

For type 1 diabetes, the recommended therapy includes multiple-dose insulin injections (3-4 injections/day of basal and prandial insulin) or continuous subcutaneous insulin infusion 2
Prandial insulin should be matched to carbohydrate intake, premeal blood glucose, and anticipated activity 2, 4

The American Diabetes Association recommends evaluating A1C regularly as it remains the primary predictor of complications 4

Overly strict glycemic targets (<110 mg/dL or 6.1 mmol/L) are not recommended as they increase risk of hypoglycemia without improving outcomes 5
The American Diabetes Association changed its preprandial target from 70-130 mg/dL to 80-130 mg/dL in 2015 to limit overtreatment and provide a safety margin when titrating glucose-lowering medications 1

The American Diabetes Association recommends a pre‑prandial (before meals) capillary plasma glucose of 80–130 mg/dL (4.4–7.2 mmol/L) for adults with type 1 diabetes on insulin therapy【8】.
The ADA sets the peak post‑prandial (1–2 h after meals) glucose target at < 180 mg/dL (< 10.0 mmol/L)【8】.
The ADA defines the random (any time) blood glucose goal as < 180 mg/dL (10.0 mmol/L)【9】【10】.

Any glucose reading < 70 mg/dL (3.9 mmol/L) requires immediate treatment with 15–20 g of fast‑acting carbohydrate【8】.
The ADA classifies hypoglycemia level 1 as 70 mg/dL ≥ ≥ 54 mg/dL (3.9–3.0 mmol/L), which warrants treatment【8】.
Hypoglycemia level 2 is defined as < 54 mg/dL (3.0 mmol/L) and demands prompt corrective action【8】.
Hypoglycemia level 3 involves severe cognitive impairment requiring assistance from another person【8】.

Post‑prandial glucose measured 1–2 h after meals is used to guide adjustments of rapid‑acting (meal‑time) insulin【8】.
When A1C goals are not achieved despite satisfactory pre‑prandial control, clinicians should specifically target post‑prandial glucose for further optimization【8】.