How should I adjust my basal‑bolus insulin regimen (27 U long‑acting insulin and 28 U rapid‑acting insulin) given recent glucose readings of 269 mg/dL (high) and 94 mg/dL (low)?

Insulin Dose Adjustment for High Glucose Variability

You need to investigate the cause of your hypoglycemia (94 mg/dL) before making any upward adjustments to address the hyperglycemia (269 mg/dL), and if no clear cause is found, reduce your rapid-acting insulin dose by 10-20% (approximately 3-6 units, bringing it to 22-25 units) while maintaining your basal dose at 27 units. 1

Critical First Step: Address the Hypoglycemia

The presence of a glucose reading of 94 mg/dL alongside 269 mg/dL indicates high glucose variability, which is a red flag for insulin dosing problems. According to the 2025 ADA Standards of Care, when hypoglycemia occurs without a clear reason (such as missed meals, excessive exercise, or medication errors), you must lower the corresponding insulin dose by 10-20% before attempting to address hyperglycemia 1.

Determine Which Insulin Caused the Low:

• If the 94 mg/dL occurred fasting or before a meal: Your basal insulin (27 units) may be too high
• If the 94 mg/dL occurred 2-4 hours after a meal: Your rapid-acting insulin (28 units) is likely excessive for that meal

Your Current Regimen Analysis

Your doses are relatively high (27 units basal + 28 units rapid-acting = 55 units total daily dose), suggesting you're not underinsulinized. The problem is distribution and timing, not total amount.

Key Questions to Answer:

1. When did the 269 mg/dL occur? (Fasting vs. post-meal determines which insulin to adjust)
2. When did the 94 mg/dL occur? (Critical for safety)
3. Are you taking 28 units of rapid-acting as a single dose or split across meals?

Recommended Adjustment Algorithm

If the 94 mg/dL was fasting/pre-meal:

• Reduce basal insulin by 10-20%: Lower from 27 units to 22-24 units
• Keep rapid-acting at 28 units (assuming split across meals)
• Monitor fasting glucose for 3 days before further adjustments 1

If the 94 mg/dL was post-meal:

• Keep basal at 27 units
• Reduce the rapid-acting dose for that specific meal by 10-20%: If taking 28 units as a single dose (which is excessive), this needs to be split across meals
• Proper prandial dosing: Start with 4 units per meal or 10% of basal dose (approximately 3 units per meal) 1

If the 269 mg/dL was fasting:

Once hypoglycemia is addressed, increase basal insulin by 2 units every 3 days until fasting glucose reaches target 1

If the 269 mg/dL was post-meal:

Once hypoglycemia is addressed, increase rapid-acting insulin for that specific meal by 1-2 units or 10-15% 1

Critical Safety Concern: Prandial Insulin Distribution

If you're taking all 28 units of rapid-acting insulin as a single dose before one meal, this is dangerous and explains your glucose variability. Rapid-acting insulin should be distributed across meals, typically:

• Start with the largest meal or the meal causing the highest post-meal glucose spike
• Initial dose: 4 units per meal or 10% of basal dose 1
• For your 27-unit basal dose, this would be approximately 3 units per meal initially

Monitoring Requirements

• Check glucose before each meal and at bedtime minimum
• Pattern recognition: Look for consistent highs or lows at the same time each day
• Adjust every 3 days for basal insulin 1
• Adjust every 2-3 days for prandial insulin once patterns emerge

Common Pitfalls to Avoid

1. Never increase insulin doses when experiencing hypoglycemia - this will worsen glucose variability and increase severe hypoglycemia risk
2. Don't adjust both basal and prandial insulin simultaneously - you won't know which change caused the effect
3. Avoid "chasing" individual glucose readings - look for patterns over 2-3 days
4. Don't use the same rapid-acting dose for all meals - carbohydrate content varies by meal

When to Seek Immediate Help

• Glucose <70 mg/dL with symptoms
• Glucose <40 mg/dL (severe hypoglycemia) 1
• Glucose >300 mg/dL with symptoms of hyperglycemia 1
• Persistent glucose variability despite dose adjustments

You should also have a glucagon prescription for emergent hypoglycemia 1, which is essential given your current glucose variability and insulin doses.