DKA Insulin Drip Calculator
Calculate the intravenous insulin infusion rate for diabetic ketoacidosis (DKA) from body weight, using the standard weight-based protocol.
How to Use This Calculator
- Enter body weight in kilograms.
- Choose the infusion rate — 0.1 u/kg/hr standard, 0.14 u/kg/hr no-bolus, or a reduced 0.05 u/kg/hr.
- Select the drip concentration (commonly 1 unit/mL) and whether an initial IV bolus is given.
- Read the rate in both units/hr and mL/hr, plus the bolus dose if selected.
This reproduces a standard weight-based protocol for teaching and reference. Actual orders follow your institution's DKA protocol with lab and potassium monitoring.
The DKA Insulin Infusion Protocol
In diabetic ketoacidosis, a continuous IV infusion of regular insulin shuts off ketone production and lowers glucose. The widely used ADA protocol is a fixed-rate, weight-based infusion, with or without an initial bolus.
At the usual 1 unit/mL bag, units/hr and mL/hr are the same number. Example: a 70 kg patient → 70 × 0.1 = 7 units/hr = 7 mL/hr.
An optional initial bolus of 0.1 u/kg may be given; alternatively a higher continuous rate (0.14 u/kg/hr) with no bolus is an evidence-based equivalent.
Key Protocol Safeguards
- Check potassium first. Hold insulin if K⁺ < 3.3 mEq/L and replace potassium first — insulin drives K⁺ into cells and can cause fatal hypokalemia.
- Fluids before/with insulin. IV fluid resuscitation precedes or accompanies the insulin drip.
- Add dextrose to the fluids once glucose falls to about 200 mg/dL, continuing insulin to clear ketones.
- Overlap subcutaneous insulin by 1–2 hours before stopping the drip to prevent rebound. See the IV-to-subcutaneous calculator.
DKA Diagnostic Criteria & Severity
Diabetic ketoacidosis is confirmed by three findings together: blood glucose above ~250 mg/dL, metabolic acidosis (low pH and bicarbonate), and ketones in blood or urine, usually with a raised anion gap. Severity is graded from the pH, bicarbonate and mental status.
| Severity | Arterial pH | Bicarbonate (mEq/L) | Mental state |
|---|---|---|---|
| Mild | 7.25–7.30 | 15–18 | Alert |
| Moderate | 7.00–7.24 | 10 to <15 | Alert / drowsy |
| Severe | < 7.00 | < 10 | Stupor / coma |
Grade severity and the anion gap with the DKA assessment calculator. The infusion rate above is usually the same across severities; severe cases differ in monitoring and fluid/electrolyte management.
Frequently Asked Questions
What is the insulin infusion rate for DKA?
The standard is a continuous IV regular-insulin infusion at 0.1 units/kg/hr, often after a 0.1 units/kg bolus. A 70 kg patient receives about 7 units/hr. An alternative is 0.14 units/kg/hr with no bolus.
Why must potassium be checked before insulin in DKA?
Insulin pushes potassium into cells, which can cause life-threatening hypokalemia. If serum potassium is below about 3.3 mEq/L, insulin is held and potassium is replaced first.
When do you add dextrose during DKA treatment?
When blood glucose falls to roughly 200 mg/dL, dextrose is added to the IV fluids so the insulin infusion can continue clearing ketones without causing hypoglycemia.
Is this DKA calculator for home use?
No. DKA is a medical emergency requiring hospital care, IV fluids, lab monitoring, and a protocol. This tool is an educational reference for clinicians and students. If you suspect DKA, seek emergency care immediately.
How fast should blood glucose fall during DKA treatment?
The target is a steady fall of about 50–75 mg/dL per hour. If glucose isn't dropping at least ~50 mg/dL in the first hour (with adequate fluids), the infusion rate is often increased. Once glucose reaches ~200 mg/dL, dextrose is added so insulin can keep clearing ketones without causing a low.
When can the insulin drip be stopped or switched to injections?
When DKA has resolved: glucose under 200 mg/dL plus two of — bicarbonate ≥ 15 mEq/L, venous pH > 7.3, and anion gap ≤ 12. Subcutaneous insulin is then started and overlapped with the drip for 1–2 hours before the infusion is stopped, to prevent rebound hyperglycemia and ketosis.
Sources
- Kitabchi AE, et al. "Hyperglycemic Crises in Adult Patients With Diabetes." Diabetes Care. 2009.
- American Diabetes Association. Standards of Care in Diabetes — 2024. Section 16.
Last reviewed: June 2025