dromlakhani Initiate correctional insulin over scheduled insulin for patients with no prior diabetes and hyperglycemia >140 mg/dL
STEP 1 — Gather Information
Collect history of diabetes (none), admission blood glucose >140 mg/dL, current point-of-care glucose readings, comorbidities, home medications, renal function, nutrition status (NPO vs eating), and frequency of glucose monitoring.
STEP 2 — Rule In / Rule Out
If patient has no prior diabetes and admission BG >140 mg/dL → proceed to correctional insulin initiation. If known diabetes or admission BG ≤140 mg/dL → do not use this pathway.
STEP 3 — Classify or Stratify
Stratify by persistence of hyperglycemia: if ≥2 POC-BG measurements ≥180 mg/dL in a 24-hour period while on correctional insulin alone → consider adding scheduled insulin; if not persistent → continue correctional insulin alone.
STEP 4 — Decide
If hyperglycemia not persistent: continue correctional insulin dosing based on pre-meal or q4-6h POC-BG (e.g., lispro 2 units for BG 150-180, 4 units for 181-250, 6 units for >250), targeting 100-180 mg/dL. If persistent hyperglycemia: add basal insulin (e.g., glargine 0.1-0.2 units/kg nightly) while continuing correctional component.
Clinical Guardrails / Mimics / Pitfalls
Do not use sliding scale insulin without defined parameters; avoid hypoglycemia by withholding correction if BG <150 mg/dL; do not delay insulin if BG >180 mg/dL; avoid scheduled basal insulin alone in patients with variable oral intake; monitor for hypoglycemia especially if NPO or reduced intake; consider renal dosing adjustments for insulin.
Concrete Clinical Example
A 68-year-old admitted for community-acquired pneumonia, no diabetes history, admission BG 162 mg/dL. Started correctional insulin lispro 2 units if BG 150-180, 4 units if 181-250, 6 units if >250 before meals and q6h if NPO. After 12h, two BG readings 192 and 205 mg/dL → persistent hyperglycemia → added basal glargine 10 units nightly while continuing correctional doses.
Source: Management of Hyperglycemia in Hospitalized Adult Patients in Non-Critical Care Settings: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2022, https://doi.org/10.1210/clinem/dgac278
TODO: consider adding scripts/calc.py for the es-initial-correctional-insulin-no-prior-diabetes calculator