Guide — Endocrine
Hospital Glycemic Management
Inpatient glucose targets, basal-bolus-correctional insulin regimens, insulin drip protocols, NPO management, steroid-induced hyperglycemia, and nursing priorities at the bedside.
10 min read · Endocrine
Educational use only. Insulin protocols, glucose targets, and dosing guidelines vary significantly by institution and patient population. Always follow facility-specific protocols and provider orders. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Why Hospital Patients Develop Hyperglycemia
Hyperglycemia in hospitalized patients is extremely common — affecting diabetic AND non-diabetic patients. Stress hyperglycemia occurs even without a diabetes diagnosis.
| Cause | Mechanism | Nursing Implication |
|---|---|---|
| Physiologic stress | Surgery, trauma, infection, illness → catecholamines, glucagon, cortisol release → insulin resistance + gluconeogenesis | Monitor glucose even in non-diabetic patients admitted with acute illness |
| Corticosteroids | Glucocorticoids drive hepatic gluconeogenesis and cause peripheral insulin resistance; effect peaks 4–8h post-dose | Anticipate post-dose glucose spike; may need afternoon/evening coverage with AM steroid doses |
| Enteral/parenteral nutrition | TPN glucose load, continuous tube feeding glucose delivery overwhelm endogenous insulin capacity | Check glucose every 6h during TPN; insulin added to TPN bags or given subcutaneously |
| IV dextrose solutions | D5W, D10W, and other dextrose-containing fluids provide continuous glucose load | Consider glucose in total daily carbohydrate intake; watch for glucose spikes |
| Reduced physical activity | Inactivity reduces glucose utilization by skeletal muscle | Encourage ambulation when safe; coordinate glucose monitoring with activity level changes |
Inpatient Glucose Targets
| Setting | Target Range | Rationale |
|---|---|---|
| ICU / Critical care | 140–180 mg/dL | ADA/AACE recommendation; tight control (<110) increases hypoglycemia risk in ICU (NICE-SUGAR trial evidence) |
| Non-ICU (general ward) | < 180 mg/dL (preprandial 80–130 ideal) | Balance glucose control benefits with hypoglycemia risk in general patient population |
| Critically low (any setting) | < 70 mg/dL | Treat immediately per hypoglycemia protocol; notify provider |
| Critically high (any setting) | > 500 mg/dL | Assess for DKA/HHS; notify provider; treat per protocol |
Basal-Bolus-Correctional Insulin Regimen
The basal-bolus-correctional (BBC) regimen is the preferred inpatient insulin approach for most non-ICU patients — it mimics physiologic insulin secretion and provides consistent glucose control compared to sliding scale alone.
| Component | Purpose | Insulin Type | Timing |
|---|---|---|---|
| Basal | Controls fasting/overnight glucose; suppresses hepatic glucose production between meals | Long-acting (glargine, detemir, degludec) | Once or twice daily at consistent time; do NOT hold if NPO (reduce dose ~20–50% per order) |
| Bolus (nutritional) | Covers glucose from meals/tube feeds | Rapid-acting (lispro, aspart, glulisine) | With each meal — hold if patient not eating; give with meal tray to reduce hypoglycemia risk if meal uncertain |
| Correctional (sliding scale) | Corrects existing hyperglycemia above target; supplemental dose added to bolus when glucose is above range | Rapid-acting; dose based on current glucose and correction scale | With each glucose check before meals; stand-alone sliding scale is discouraged as sole treatment (reactive, not proactive) |
Insulin Drip (Continuous Insulin Infusion)
When used: DKA/HHS, severe hyperglycemia, perioperative glucose management in ICU, patients on TPN with poor glucose control, post-cardiac surgery, organ transplant recipients.
Insulin type: Regular insulin ONLY for IV infusion — rapid-acting analogs (lispro, aspart) are NOT approved for IV infusion in most protocols.
| Topic | Key Information |
|---|---|
| Monitoring frequency | Every 1–2 hours minimum (per protocol); more frequent if glucose is unstable or during rate changes |
| Rate adjustment | Follow validated insulin drip algorithm (facility protocol); adjustments based on current glucose AND rate of change |
| Transition to SQ insulin | Give first SQ basal dose 2–4 hours BEFORE discontinuing drip — allows SQ insulin to reach therapeutic level before IV discontinued |
| Hypoglycemia risk | High alert — have D50W at bedside; decrease drip rate immediately for glucose < 70; hold drip for < 60 mg/dL per protocol |
| Dextrose co-infusion | D5NS or D5W often infused with insulin drip in DKA once glucose falls to 200–250 mg/dL to prevent hypoglycemia while continuing to clear ketones |
NPO Patient Management
- Basal insulin: Generally continue at 75–80% of usual dose when NPO (do not hold entirely — needed to prevent ketosis); exact dose adjustment per order
- Bolus (meal) insulin: Hold if patient is NPO — no meal = no meal bolus
- Home oral antidiabetic medications: Most held when NPO; metformin held with contrast procedures; sulfonylureas held NPO (hypoglycemia risk)
- Point-of-care glucose: Monitor every 4–6 hours when NPO; adjust per sliding scale
- IV fluids: D5NS may be ordered to prevent hypoglycemia and ketosis in Type 1 patients who are NPO
- Insulin pump patients: Coordinate with provider and diabetes team — some continue pump during procedures; never assume pump is suspended
Point-of-Care Glucose Monitoring
| Situation | Monitoring Frequency |
|---|---|
| Stable non-ICU, eating | Before meals and at bedtime (AC/HS — 4 times daily) |
| Stable non-ICU, NPO | Every 4–6 hours |
| ICU patients on insulin drip | Every 1–2 hours per protocol |
| Patients receiving TPN | Every 6 hours until stable, then per order |
| Patient on corticosteroids | Before meals and at bedtime (anticipate glucose spike 4–8h after AM dose) |
Glucose meter accuracy considerations
- Capillary (fingerstick) glucose: ±15–20% of lab value; use lab plasma glucose when clinically critical
- Peripheral edema, poor circulation, vasopressors: fingerstick may be inaccurate — use arterial blood gas glucose instead
- Hematocrit extremes (very high or low) affect POC meter accuracy
NCLEX Pearls
ICU glucose target = 140–180 mg/dL: NOT 80–110 (tight control shown to increase mortality in NICE-SUGAR trial). Avoid overly aggressive targets in ICU.
Sliding scale alone is inadequate: The preferred regimen is basal-bolus-correctional. Sliding scale alone is reactive — it treats hyperglycemia after it occurs rather than preventing it.
Regular insulin ONLY for IV: Only regular insulin (not lispro, aspart, glulisine) is approved for IV infusion in standard protocols.
Transition timing: Give SQ insulin 2–4 hours BEFORE stopping insulin drip — ensures continuous coverage without gap.
Basal insulin when NPO: Do NOT hold entirely — typically reduce by 20–50% as ordered. Holding completely in Type 1 DM patients risks DKA even when fasting.
Steroid-induced hyperglycemia: Peaks 4–8 hours after AM corticosteroid dose — anticipate glucose spike and have coverage orders in place before it occurs.
Related Resources
Standards & sources
Fact-checked Jun 20, 2026This page is written to align with American Diabetes Association (ADA) Standards of Care · American Association of Clinical Endocrinology (AACE). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →