Which A1C Test Should I Ask For If My Glucose Is Borderline?

If you’ve had a blood sugar reading that feels “in-between”—for example, a fasting glucose of 112 mg/dL—you might be wondering where you stand and what to do next. This guide explains which A1C (hemoglobin A1C) test to request, how to interpret your results, and what steps you can take to keep your blood sugar in a healthy range.

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Is 112 Glucose High?

A single glucose reading of 112 mg/dL can mean different things depending on when you tested:

• Fasting glucose (no food for at least 8 hours):
  • Normal: 70–99 mg/dL
  • Prediabetes (borderline): 100–125 mg/dL
  • Diabetes: ≥ 126 mg/dL

• Random (non-fasting) glucose:
  • Normal: up to about 140 mg/dL
  • If you’re under medical care, your doctor may aim for lower targets.

So, a fasting glucose of 112 mg/dL falls into the prediabetes range. That doesn’t mean you have diabetes right now, but it does signal that your blood sugar is edging higher than ideal.

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Why Ask for an A1C Test?

A1C measures the percentage of hemoglobin proteins in your red blood cells that have glucose attached. Because red blood cells live about 3 months, the A1C gives an average of your blood sugar over that period.

Key benefits of A1C testing:

• Tracks long-term trends, not just one day’s reading
• Can identify prediabetes (average A1C 5.7–6.4%) before diabetes sets in (A1C ≥ 6.5%)
• Doesn’t require fasting

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Which A1C Test to Request

When you speak with your provider or the lab, here’s what to specify:

1. Hemoglobin A1C (often just called “A1C” or “HbA1c”)
   – The standard test for average blood sugar over 2–3 months.

2. NGSP-Certified Laboratory
   – Ask that the lab be certified by the National Glycohemoglobin Standardization Program (NGSP).
   – Ensures your results match the Diabetes Control and Complications Trial (DCCT) reference.

3. Point-of-Care vs. Lab-Drawn
   – Point-of-care (fingerstick) A1C tests give quick results in a doctor’s office.
   – Lab-drawn venous samples are generally more precise.
   – If you want the most accurate number, request a lab-drawn test.

4. Additional Tests (if needed)
   – Fructosamine: average glucose over 2–3 weeks. Useful if your red blood cell lifespan is abnormal.
   – Oral Glucose Tolerance Test (OGTT): measures how your body handles sugar over 2 hours.

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How to Interpret A1C Results

Once you have your lab report, you’ll see a percentage:

• Below 5.7%
  – Normal average glucose
• 5.7% – 6.4%
  – Prediabetes (borderline)
• 6.5% or higher
  – Diabetes likely
• Target for people with diabetes
  – Often < 7.0%, but your personal goal may differ

Each 1% change in A1C corresponds to about a 28–29 mg/dL shift in average blood sugar. For example, an A1C of 6.0% roughly equals an average glucose of 126 mg/dL.

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What to Do If Your A1C Is Borderline

If your A1C comes back in the prediabetes range, you have an opportunity to prevent or delay diabetes:

• Nutrition

  • Focus on whole foods: vegetables, lean proteins, whole grains
  • Balance meals (carbs + protein + healthy fats)
  • Watch portion sizes

• Physical Activity

  • Aim for 150 minutes of moderate exercise per week (e.g., brisk walking, cycling)
  • Include strength training 2 days a week

• Weight Management

  • Even modest weight loss (5–7% of body weight) can improve blood sugar
  • Work with a dietitian or diabetes educator if possible

• Regular Monitoring

  • Recheck A1C every 3–6 months until stable
  • Consider home glucose monitoring if recommended

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When to Seek Further Evaluation

Borderline results can evolve. Discuss with your doctor whether you need:

• More frequent blood sugar checks
• An OGTT for a clearer picture of post-meal glucose spikes
• Consultation with an endocrinologist

You can also try a free, online symptom check, using the doctor approved Ubie Symptom Checker to get personalized guidance on when to see your provider.

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Speak to a Doctor

This information is not a substitute for medical advice. If you experience:

• Unexplained weight loss
• Excessive thirst or urination
• Sudden vision changes
• Symptoms that feel severe or life threatening

…please speak to a doctor right away or call emergency services. Early action can make a big difference in health outcomes.

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By asking for the right A1C test—an NGSP-certified, lab-drawn hemoglobin A1C—you can get a clear view of your longer-term blood sugar control. If your laboratory result shows prediabetes, lifestyle adjustments and regular follow-up can help you avoid progression to diabetes. And remember, any serious or sudden symptoms warrant an immediate conversation with a healthcare professional.