How can I create a sliding‑scale insulin chart with correction doses for a patient?

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How to Create a Sliding Scale Insulin Chart with Corrections

Do not use sliding scale insulin (SSI) alone as your primary approach—instead, create a correction insulin scale that is integrated with scheduled basal-bolus insulin therapy, as SSI alone is associated with poor glycemic control and is condemned by current guidelines 1, 2.

Key Distinction: Correction Insulin vs. Sliding Scale Insulin

The terminology matters here:

  • Sliding Scale Insulin (SSI): A reactive, outdated approach where insulin is given only after hyperglycemia occurs, without regard to meals, existing insulin, or individual sensitivity. This approach is strongly discouraged 1, 2.

  • Correction Insulin: A component of scheduled insulin therapy where rapid-acting insulin is administered based on pre-meal glucose readings (or every 4-6 hours if NPO), used in combination with basal and/or prandial insulin 2.

Creating a Correction Insulin Scale

Step 1: Calculate the Correction Factor (Insulin Sensitivity Factor)

Use the 1800 Rule for rapid-acting insulin analogues (lispro, aspart, glulisine):

  • Correction Factor = 1800 ÷ Total Daily Dose (TDD) of insulin

Use the 1500 Rule for regular (short-acting) human insulin:

  • Correction Factor = 1500 ÷ TDD 3, 4

Example: If a patient requires 50 units of insulin per day:

  • With rapid-acting: 1800 ÷ 50 = 36 mg/dL per unit
  • This means 1 unit of insulin will lower blood glucose by approximately 36 mg/dL

Step 2: Determine the Target Blood Glucose

Set your target glucose (typically 100-140 mg/dL for most hospitalized patients).

Step 3: Create the Correction Dose Table

Formula: Correction dose = (Current BG - Target BG) ÷ Correction Factor

Create a table with incremental glucose ranges:

Blood Glucose (mg/dL) Correction Dose (units)
141-180 1 unit
181-220 2 units
221-260 3 units
261-300 4 units
301-340 5 units
>340 6 units + notify MD

This example assumes a correction factor of ~40 mg/dL per unit

Integrating Correction Insulin into a Complete Regimen

For Patients Eating Regular Meals (Basal-Bolus Approach)

Calculate Total Daily Dose (TDD):

  • Insulin-naive patients: 0.3-0.5 units/kg/day 1
  • Lower doses (0.3 units/kg): For elderly (>65 years), renal failure, poor oral intake 1
  • Patients on home insulin ≥0.6 units/kg: Reduce by 20% to prevent hypoglycemia 1

Distribute the TDD:

  • 50% as basal insulin (given once or twice daily)
  • 50% as prandial insulin (divided equally before 3 meals)
  • Add correction insulin using your calculated scale before each meal 2

Example for 70 kg patient:

  • TDD = 0.4 × 70 = 28 units/day
  • Basal: 14 units (glargine once daily)
  • Prandial: ~5 units before each meal (rapid-acting)
  • Correction: Add per scale based on pre-meal glucose

For Patients with Mild Hyperglycemia or Poor Oral Intake (Basal-Plus Approach)

  • Basal insulin only: 0.1-0.25 units/kg/day 1
  • Correction insulin: Every 4-6 hours (if NPO) or before meals 2
  • This approach reduces hypoglycemia risk in patients with glucose <200 mg/dL 1

For Patients Not Eating (NPO)

  • Basal insulin: Continue at reduced dose
  • Hold prandial insulin
  • Correction insulin only: Every 4-6 hours based on glucose checks 2

Critical Pitfalls to Avoid

  1. Never use SSI alone in patients with known diabetes—this leads to persistent hyperglycemia and worse outcomes 1, 2

  2. Never use SSI alone in type 1 diabetes—these patients require basal insulin at all times 1

  3. Adjust for hypoglycemia risk: Lower all doses by 20-50% in elderly, renal failure, or unpredictable oral intake 1

  4. Premixed insulins (70/30) are NOT recommended in hospitals due to unacceptably high hypoglycemia rates 1

  5. The only acceptable use of SSI alone is in patients without diabetes who have mild stress hyperglycemia 1

Documentation Format

Your order set should include:

  • Basal insulin: [Type] [Dose] units [Frequency]
  • Prandial insulin: [Type] [Dose] units before meals
  • Correction scale: [Type of rapid-acting insulin] per scale:
    • BG 141-180: 1 unit
    • BG 181-220: 2 units
    • (Continue as calculated above)
  • Glucose monitoring: Before meals and bedtime (or every 4-6 hours if NPO)

The basal-bolus approach with integrated correction dosing has consistently demonstrated superior glycemic control and reduced complications compared to SSI alone 1, though it carries a 12-30% risk of mild hypoglycemia that requires vigilant monitoring 1.

References

1
Guideline

management of diabetes and hyperglycaemia in the hospital.

The Lancet Diabetes and Endocrinology, 2021

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.