I take 28 units of insulin glargine (basal insulin) once daily in the morning and my hemoglobin A1c is 7.1%; should I continue this dose or adjust it?

Should You Adjust Your 28 Units of Morning Insulin Glargine with HbA1c at 7.1%?

Your HbA1c of 7.1% is close to the standard goal of <7%, but whether to adjust depends on your individualized glycemic target, hypoglycemia risk, and fasting glucose levels. 1, 2

Evaluating Your Current Control

Your HbA1c of 7.1% represents borderline control. The 2025 ADA Standards recommend:

• Target HbA1c <7% (53 mmol/mol) for most nonpregnant adults 2
• If using CGM, target time in range >70% 2
• Hypoglycemia thresholds: <4% time below 70 mg/dL, <1% time below 54 mg/dL 2

Key Decision Points

First, check your fasting plasma glucose (FPG):

• If FPG is at goal (typically 80-130 mg/dL) but HbA1c remains 7.1%, you likely have postprandial hyperglycemia rather than inadequate basal coverage 1
• If FPG is above goal, your basal insulin dose needs titration 1

Look for signs of overbasalization 1:

• Bedtime-to-morning glucose differential ≥50 mg/dL (≥2.8 mmol/L)
• Hypoglycemia episodes (aware or unaware)
• High glucose variability
• Large preprandial-to-postprandial glucose differences

Recommended Actions Based on Your Situation

If FPG is Above Goal (>130 mg/dL):

Increase your insulin glargine dose using a structured titration algorithm 1:

• Increase by 2 units every 3 days until FPG reaches goal without hypoglycemia
• Continue monitoring closely
• If hypoglycemia occurs without clear cause, reduce dose by 10-20% 1

Your current 28 units is a reasonable maintenance dose, and further titration is appropriate if glycemic targets aren't met 3.

If FPG is at Goal but HbA1c Remains 7.1%:

Do NOT simply increase basal insulin further - this indicates overbasalization 1. Instead:

1. Add a GLP-1 receptor agonist (GLP-1 RA) or dual GIP/GLP-1 RA to your regimen 1

   • This addresses postprandial glucose without increasing hypoglycemia risk
   • Consider fixed-ratio combination products (iGlarLixi or IDegLira) 1
   • This approach is preferred over adding prandial insulin initially

2. If GLP-1 RA is contraindicated or unavailable, add prandial insulin 1:

   • Start with 4 units or 10% of basal dose (approximately 3 units) with your largest meal
   • Titrate based on postprandial glucose readings

Timing Consideration

You mentioned taking glargine in the morning. Morning versus bedtime administration shows equivalent efficacy and hypoglycemia risk 4, so continue your morning schedule if it works for your routine. The key is consistency - same time daily 3.

Important Caveats

Reassess your treatment every 3-6 months to avoid therapeutic inertia 1. Your HbA1c of 7.1% warrants action rather than observation.

Consider less stringent goals if 2:

• You have limited life expectancy
• Frequent or severe hypoglycemia occurs
• You have significant comorbidities where treatment harms exceed benefits

Monitor for hypoglycemia closely during any dose adjustments 3. Ensure you have glucagon prescribed for emergencies 1.

If you have type 1 diabetes, you must be on short-acting prandial insulin in addition to basal insulin 3. The question context suggests type 2 diabetes, but this distinction is critical.

Bottom Line Algorithm

1. Check your fasting glucose pattern over 3-7 days
2. If FPG >130 mg/dL: Increase glargine by 2 units every 3 days until FPG 80-130 mg/dL 1
3. If FPG is at goal: Add GLP-1 RA rather than increasing basal insulin 1
4. Reassess HbA1c in 3 months 1
5. If HbA1c remains >7% despite optimized basal + GLP-1 RA: Add prandial insulin 1

Your current dose of 28 units is not necessarily wrong, but the approach to reaching HbA1c <7% depends entirely on whether your fasting glucose is controlled.