How much insulin for gene more than 480
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insulin correction dose blood glucose above 480 mg/dL sliding scale
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Insulin for Blood Glucose > 480 mg/dL
A glucose of >480 mg/dL is severe hyperglycemia. The approach depends on the clinical setting and patient type.
Step 1 - Rule Out a Metabolic Emergency First
Before calculating a correction dose, check for:
- DKA (Type 1 or insulin-deficient Type 2): ketones in blood/urine, anion gap, pH
- HHS (Hyperosmolar Hyperglycemic State): typically Type 2, older patients, minimal ketones, very high osmolality
If either is present, standard correction doses are NOT sufficient - these require IV regular insulin infusion and aggressive fluid resuscitation in hospital.
The Washington Manual states: "Extreme hyperglycemia (≥300 mg/dL) on one or more consecutive tests should prompt testing for ketoacidosis with electrolytes and ketone measurements." - Washington Manual of Medical Therapeutics
Step 2 - Calculating the Correction Dose (Outpatient / Non-Critical)
Use the Rule of 1800 (for rapid-acting insulin):
Insulin Sensitivity Factor (ISF) = 1800 ÷ Total Daily Dose (TDD)
This gives you how many mg/dL one unit of rapid-acting insulin will lower blood glucose.
Then:
Correction Dose = (Current BG - Target BG) ÷ ISF
Example - glucose is 480 mg/dL:
| TDD | ISF (1800 ÷ TDD) | Target BG | Correction Dose |
|---|---|---|---|
| 30 units | 60 mg/dL/unit | 150 mg/dL | (480−150) ÷ 60 = 5.5 units |
| 50 units | 36 mg/dL/unit | 150 mg/dL | (480−150) ÷ 36 = ~9 units |
| 70 units | 25 mg/dL/unit | 150 mg/dL | (480−150) ÷ 25 = ~13 units |
- Target BG for correction should be 150 mg/dL (conservative, to avoid hypoglycemia overshoot) - Textbook of Family Medicine 9e
- Correction doses use rapid-acting insulin (lispro, aspart, glulisine) added to the premeal dose
- Recheck BG in 2 hours after correction
Step 3 - Sliding Scale Approach (If No TDD Known)
A common hospital sliding scale for a typical adult with BG > 480:
| BG Range (mg/dL) | Low Sensitivity | Moderate | High Sensitivity |
|---|---|---|---|
| 401-500 | 8 units | 12 units | 16 units |
| >500 | 10 units | 14 units | 18 units |
(Scales vary by institution and patient insulin sensitivity.)
The Washington Manual notes: a correction dose of 1-2 units per 50 mg/dL above 140 mg/dL is a standard starting point for insulin-naive patients. For BG = 480:
- 480 - 140 = 340 mg/dL above target
- 340 ÷ 50 = 6.8 → ~6-7 units (low-sensitivity/insulin-naive patient)
Step 4 - Hospital / IV Insulin (Critical Care)
If the patient is critically ill or cannot take oral/SC medications:
- Use IV regular insulin infusion, guided by hourly bedside glucose checks
- Provide a dextrose-containing IV solution alongside to prevent hypoglycemia
- Transition to SC insulin 2 hours before stopping the infusion - Washington Manual of Medical Therapeutics
Key Safety Points
- Never give a correction dose at bedtime without supervision - risk of nocturnal hypoglycemia
- Recheck glucose in 1-2 hours after any large correction dose
- Do not stack doses - wait at least 3-4 hours between correction doses
- A blood glucose >480 with any symptoms (vomiting, altered consciousness, rapid breathing, fruity breath) = emergency - seek immediate hospital care
Bottom line: There is no single fixed insulin dose for BG >480. It is personalized using the Rule of 1800 formula. For a typical adult without a known TDD, roughly 6-14 units of rapid-acting insulin is the common correction range, but this must always be individualized and confirmed with a prescriber or diabetes care team.
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