Insulin Drip Calculator — DKA, HHS & ICU Glycemic Protocol

How to Use This Calculator

1. Enter blood glucose, patient weight, and select DKA/HHS or ICU protocol.
2. Starting insulin rate and pump rate appear instantly.
3. Use the DKA/HHS tab for potassium-guided dosing and dextrose timing.
4. Use the ICU Glycemic tab for titration adjustments.
5. Use the Bridge to SubQ tab to calculate basal-bolus transition doses.

Formula

Example

Frequently Asked Questions

• When is an insulin drip (continuous IV infusion) used? ▼
  Continuous intravenous insulin infusion (insulin drip) is indicated in several clinical situations where precise, titratable glucose control is required. The primary indications are: diabetic ketoacidosis (DKA) — the standard of care per ADA guidelines is 0.1 units/kg/hr regular insulin IV after confirming potassium ≥ 3.3 mEq/L; hyperosmolar hyperglycemic state (HHS) — similar insulin protocol but typically lower starting rate due to lower insulin resistance; critical illness hyperglycemia in the ICU — continuous infusion allows rapid dose adjustment to maintain blood glucose 140–180 mg/dL per ADA 2026 recommendations, avoiding the variability of subcutaneous absorption in haemodynamically unstable patients; perioperative glycemic control in cardiac surgery — tight intraoperative glucose management reduces sternal wound infections and improves outcomes; and hyperglycemic emergencies in type 1 diabetes outside of typical DKA (e.g., during surgery, NPO status, or enteral feeding interruption). Subcutaneous insulin is inappropriate when rapid glucose changes are expected, absorption is unpredictable (shock, oedema, vasopressor use), or very precise hourly adjustment is clinically necessary.
• What is the standard insulin rate for DKA and why 0.1 units/kg/hr? ▼
  The standard starting insulin infusion rate for DKA is 0.1 units/kg/hr of regular insulin (human regular insulin, not analogue insulins), derived from pharmacokinetic and clinical studies showing this dose reliably closes the anion gap (resolves ketoacidosis) while maintaining a manageable rate of glucose decline (50–75 mg/dL/hr is the target). An earlier approach used a 0.1 units/kg bolus before the drip, but this is no longer recommended in most guidelines as it increases hypoglycemia risk without improving resolution time. Some newer protocols use a lower starting rate of 0.05 units/kg/hr for mild to moderate DKA. A critical safety step before initiating insulin: serum potassium must be ≥ 3.3 mEq/L. Insulin drives potassium into cells, and starting insulin when potassium is already low risks fatal arrhythmia. Once blood glucose drops to 200–250 mg/dL, dextrose (D5W or D10W) is added to the IV fluids to prevent hypoglycemia while the insulin drip continues until bicarbonate ≥ 15 mEq/L and pH > 7.3 — the markers of ketoacidosis resolution, not glucose normalisation.
• Why is potassium critical to check before starting insulin? ▼
  Insulin activates the Na-K-ATPase pump, driving potassium from the extracellular space into cells. In DKA, total body potassium is depleted (due to vomiting, urinary losses, and osmotic diuresis) but serum potassium may appear normal or even elevated due to acidosis pushing potassium out of cells. Once insulin and fluids are given and acidosis corrects, serum potassium can drop precipitously. If insulin is started when potassium is already low (< 3.3 mEq/L), the resulting hypokalaemia can cause life-threatening ventricular arrhythmias including torsades de pointes and ventricular fibrillation. ADA DKA guidelines explicitly state: do not start insulin if K+ < 3.3 mEq/L. Give IV potassium at 20–40 mEq/hr until K+ ≥ 3.3, then start insulin. When K+ is 3.3–3.5 mEq/L, start insulin and give 20–40 mEq/hr KCl simultaneously. When K+ is 3.5–5.0, give 20–30 mEq K+ per litre of IV fluid. When K+ > 5.0, hold supplementation and recheck hourly. This potassium-first principle is one of the most important safety steps in DKA management.
• When can the insulin drip be stopped and how is the transition to subcutaneous made? ▼
  The insulin drip should continue until DKA resolution criteria are met: blood glucose < 200–250 mg/dL, AND serum bicarbonate ≥ 15 mEq/L, AND venous pH > 7.3, AND anion gap ≤ 12 mEq/L. Resolution of ketoacidosis takes precedence over glucose normalisation — many patients achieve euglycaemia well before the anion gap closes. For ICU glycemic drips, discontinuation criteria are clinical stability and resumption of oral or enteral intake. Transition to subcutaneous insulin is critical: regular insulin IV has a half-life of only 4–6 minutes, so stopping the drip without overlapping subcutaneous coverage causes immediate insulin deficiency and rebound hyperglycaemia or, in type 1 diabetes, recurrent DKA. The standard transition: calculate the prior 24-hour IV insulin total, reduce by 20% (80% rule to account for reduced physiological stress), split 50% as basal glargine and 50% as prandial bolus across three meals. Give the first subcutaneous basal dose 2 hours before stopping the IV infusion to allow subcutaneous onset.
• How is hypoglycemia prevented during insulin drip therapy? ▼
  Hypoglycemia (blood glucose < 70 mg/dL) is the most feared complication of insulin drip therapy and requires a systematic prevention approach. The key interventions are: hourly glucose monitoring during active titration and every 2 hours when stable — continuous glucose monitoring (CGM) may reduce fingerstick frequency but is not yet the standard of care for IV insulin in most ICUs; adding dextrose (D5W or D10W) to maintenance IV fluids when glucose approaches 200–250 mg/dL in DKA or 150–180 mg/dL in ICU protocols, allowing insulin continuation without hypoglycemia; using well-validated institutional titration protocols with explicit hypoglycemia responses (e.g., "if glucose < 80 mg/dL, reduce rate by 50%; if < 70 mg/dL, stop drip and give D50W 25 mL IV"); anticipating hypoglycemia risk during sudden clinical changes — interruption of enteral feeds, unexpected NPO status, or sepsis resolution that reduces stress hormones; and ensuring nursing staff are trained to identify hypoglycemia symptoms in sedated or obtunded patients who cannot self-report. A protocol-driven approach with mandatory physician notification for glucose < 70 mg/dL reduces severe hypoglycemia rates significantly compared to ad-hoc management.

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