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How to make insulin infusion

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insulin intravenous infusion preparation protocol regular insulin hospital guideline

IV insulin infusions should be prepared and given only under a hospital-approved protocol, with an infusion pump, frequent glucose checks, and potassium monitoring. The exact concentration and rate depend on the indication, such as DKA, HHS, hyperkalemia, perioperative control, or ICU hyperglycemia.

Common adult IV regular-insulin infusion preparation

A commonly used standardized bag is:
  • Regular insulin 100 units
  • Add to 100 mL of 0.9% sodium chloride
  • Final concentration: 1 unit/mL
Example: withdraw 1 mL from a 100-mL normal-saline bag, then add 100 units of regular insulin. Label clearly: Regular insulin 1 unit/mL, IV infusion only.
Some institutions instead use 50 units in 50 mL normal saline, which is the same 1 unit/mL concentration. Pediatric protocols may use lower-concentration preparations, for example 50 units in 500 mL.

Administration safety steps

  1. Use only short-acting regular insulin for standard IV insulin infusion, unless your local protocol specifies otherwise.
  2. Use a dedicated IV line and an infusion pump.
  3. Prime the tubing with the insulin solution first, according to the local policy. Insulin can adsorb to tubing, so this step helps ensure the delivered dose is accurate.
  4. Check bedside blood glucose at least hourly while titrating.
  5. Monitor potassium closely. Do not start insulin for DKA if potassium is severely low, commonly K⁺ <3.3 to 3.5 mmol/L depending on the protocol, because insulin lowers serum potassium further.
  6. Use a validated written or computerized titration protocol, not an ad hoc rate. ADA hospital guidance recommends validated IV-insulin protocols with predefined adjustments.

Typical DKA example only

After initial fluids and confirmation that potassium is safe, many adult protocols use:
  • Regular insulin 0.1 unit/kg/hour IV infusion
  • Usually no routine IV bolus is needed in modern protocols
  • When glucose falls to about 200 mg/dL (11.1 mmol/L), add dextrose-containing fluid and continue insulin until ketoacidosis resolves, rather than stopping insulin solely because glucose improves.
The textbook guidance emphasizes that insulin-infusion algorithms should account for insulin sensitivity, frequent glucose monitoring, and glucose trends. Harrison’s Principles of Internal Medicine, 22e, section “Management of Diabetes in a Hospital or Facility.”
Important: Do not use this as a home recipe or a substitute for your facility’s order set. If you tell me the indication and whether this is adult or pediatric, I can outline the appropriate protocol considerations.
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