• Weight 26 kg, 50F, HbA1c 22% (severely uncontrolled), RBS 480 mg/dL
• This is severe hyperglycemia - likely needs insulin initiation/intensification
• Total Daily Dose (TDD) = 0.5 units/kg/day = ~13 units/day as starting point
• Split: ~50% basal (Lantus) + ~50% bolus (HAI divided across meals)

Patient Summary

Note: HbA1c of 22% is exceptionally high - rule out haemolytic conditions, haemoglobinopathies, or lab error. This represents severely neglected/uncontrolled diabetes with likely significant insulin deficiency. With RBS 480, full basal-bolus replacement is indicated.

Step 1: Calculate Total Daily Dose (TDD)

TDD = 0.5 × 26 = 13 units/day

Step 2: Basal Insulin - Lantus (Glargine)

• Basal = 50% of TDD = 50% × 13 = ~6-7 units
• Lantus 6 units SC once daily at bedtime (or fixed evening time)

Step 3: Bolus Insulin - HAI (Regular Human Insulin)

• Bolus = 50% of TDD = ~6-7 units, divided equally across 3 meals
• Per meal dose = 6 ÷ 3 = 2 units before each meal

• HAI 2 units SC before breakfast
• HAI 2 units SC before lunch
• HAI 2 units SC before dinner

Step 4: Correction Dose for Current RBS 480

• ISF = 1800 rule (for Regular insulin) = 1800 ÷ TDD = 1800 ÷ 13 ≈ 138 mg/dL per unit
• Target glucose = 120 mg/dL
• Correction = (480 - 120) ÷ 138 = 360 ÷ 138 ≈ ~2.5 units → round to 2-3 units HAI now

Step 5: Titration Protocol (ADA 2024)

Summary Prescription

Important Cautions

1. Monitor BG 4 times/day (fasting + 2h post each meal) until stable
2. Hypoglycemia risk is significant in a 26 kg patient - keep biscuits/glucose gel accessible
3. Hypokalemia - check K+ before insulin initiation; HbA1c 22% suggests DKA-adjacent state
4. IV fluids - if clinically dehydrated with RBS 480, consider 0.9% NS ± early hydration
5. Titrate up gradually - recheck HbA1c and adjust TDD at 2-4 weeks
6. Consider referral to endocrinologist given the extreme HbA1c value
7. Per ADA 2024 Standards of Care, basal insulin starting dose is 0.1-0.2 units/kg/day for mild cases, escalated to 0.5 units/kg for replacement therapy in severe hyperglycemia - this patient qualifies for the higher dose given HbA1c and RBS levels.

Why 6 Units Glargine is Insufficient Here

1. What Glargine (Lantus) Actually Does

• Glargine is a long-acting basal insulin - it provides a flat, peakless background insulin over 24 hours
• Its job is to suppress hepatic glucose output between meals and overnight
• It does NOT correct acute hyperglycemia - it has no significant peak action to bring down a current RBS of 480 mg/dL

2. The Math Problem

• 6 units of Glargine distributed over 24 hours = 0.25 units/hour of background insulin
• At RBS 480 mg/dL, this background level is far too low to overcome the prevailing hyperglycemia and insulin resistance

3. HbA1c 22% Context

• HbA1c 22% reflects months of uncontrolled hyperglycemia
• The beta cells are likely exhausted (glucotoxicity)
• There is significant endogenous insulin deficiency - the patient is behaving functionally like an insulin-deficient state
• A small basal dose alone cannot compensate for the absent mealtime insulin response

4. What Actually Happens with Only 6U Glargine

• Fasting glucose may improve slightly over 3-7 days with dose titration
• Post-meal glucose spikes remain completely uncovered
• HbA1c will come down very slowly, likely remaining >14-15% even after weeks
• Risk of symptomatic hyperglycemia, DKA risk, osmotic symptoms continues

What is Needed Instead

Analogy

When is Basal-Only Acceptable?

• HbA1c is 7-9% with mild fasting hyperglycemia
• Post-meal spikes are modest
• Some residual beta-cell function exists
• As augmentation to oral agents

Recommendation

• Glargine 6U at night (titrate up every 3 days based on fasting BG)
• HAI 2U before each meal (titrate based on 2-hr post-meal BG)
• STAT correction dose of HAI 2-3U now
• Recheck RBS in 2-4 hours after correction dose

ADA Guidelines on Insulin Regimens for Severe Hyperglycemia (2025-2026)

1. ADA 2026 Standards of Care - Section 9 (Pharmacologic Approaches)

"Insulin should be considered as part of any combination medication plan when hyperglycemia is severe, especially if catabolic features (weight loss, hypertriglyceridemia, and ketosis) are present."

2. ADA 2025 Inpatient Standards - Section 16

"An insulin plan with basal, prandial, and correction components is the preferred treatment for most noncritically ill hospitalized individuals with adequate nutritional intake."

Initiate/intensify insulin for persistent hyperglycemia >180 mg/dL confirmed on 2 occasions within 24 hours.

3. Latest Network Meta-Analysis (Diabetologia, 2026)

"Complex insulin regimens provide modest glycaemic benefits over basal insulin but are associated with greater weight gain and a suggested higher risk of hypoglycaemia. These trade-offs support the need for individualised regimen selection."

4. Where Alternatives to Basal-Bolus Are Acceptable (ADA 2026)

For your patient at HbA1c 22%: None of these alternatives have sufficient evidence. Insulin (basal-bolus) remains the only appropriate first-line choice.

5. Clinical Decision Summary for Severe Hyperglycemia

HbA1c ≥ 10-12% OR BG ≥ 300 mg/dL OR catabolic symptoms
           ↓
    INSULIN REPLACEMENT THERAPY
           ↓
    Basal (Glargine) + Prandial (HAI/Rapid) + Correction
           ↓
    TDD = 0.5 units/kg/day
    50% basal (Glargine OD) + 50% prandial (divided 3 meals)
           ↓
    Titrate every 3 days until BG targets reached
           ↓
    As glucotoxicity resolves → rationalize/simplify regimen

Bottom Line

• ADA 2025/2026 Grade A evidence mandates basal + prandial + correction for severe hyperglycemia in non-ICU patients
• Basal alone (Glargine 6U) is inadequate for HbA1c 22%, RBS 480 - confirmed by both guidelines and the 2026 Diabetologia network meta-analysis
• Sliding scale alone is explicitly contraindicated in ADA guidelines
• Once glucotoxicity resolves (HbA1c comes down to ~9-10%), the regimen can be simplified to basal ± oral agents per the individualization principle

Revised Insulin Prescription

Daytime - HAI (Regular Human Insulin)

Lunch gets 1 extra unit as it is typically the largest meal and post-lunch glucose excursions are highest.

Nighttime - Glargine (Lantus)

• Standard starting point = 0.1-0.2 u/kg for basal initiation
• 0.2 × 26 = ~5-6 units ✓
• Keep at 6 units as the starting basal dose

Important Clarification on Regimen Structure

This means the overall TDD becomes ~19 units (not 13). This is actually appropriate for this patient given HbA1c 22% - severe insulin deficiency/resistance warrants a slightly higher TDD. At 0.7 u/kg (19 ÷ 26), this is within safe range for severe hyperglycemia.

Titration Protocol

Glargine (adjust every 3 days based on fasting morning BG):

HAI (adjust weekly based on 2-hr post-meal BG):

Monitoring Schedule

Safety Alerts for This Patient

1. Low body weight (26 kg) - hypoglycemia risk is HIGH; carry 15g fast carbs at all times
2. Never skip a meal after HAI injection - if meal skipped, halve the dose or hold
3. Sick day rules - if vomiting/not eating, hold HAI, continue Glargine at half dose, check BG every 2-4 hrs
4. Recheck RBS in 4 hours after today's first HAI dose given current BG 480
5. Target BG: fasting 80-130 mg/dL, post-meal <180 mg/dL (ADA 2025)
6. Recheck HbA1c at 8-12 weeks - expect significant reduction as glucotoxicity resolves

Glargine Timing - Does "After Meal" Matter?

Short Answer: It does NOT matter when relative to meals, but it MUST be at the same fixed time every day.

Why Glargine is Meal-Independent

What Actually Matters for Glargine

✅ MUST follow:

1. Same time every day - consistency is critical. If given at 8 PM today, give at 8 PM tomorrow
   • Timing drift of >2-3 hours creates gaps or overlaps in coverage
2. Same injection site (rotate within the same region - abdomen preferred)
3. Do NOT mix with any other insulin in the same syringe

❌ Does NOT matter:

• Before or after food
• Fed or fasted state
• Time of day (morning, evening, bedtime all acceptable - but once chosen, stay fixed)

Practical Instruction for This Patient

"Inject Glargine 6 units SC every day after dinner at the same time (e.g., 8:30 PM). Do not change this time day to day."

Revised Final Schedule

One Caution