HbA1c: What Your Doctor Isn't Telling You About This Number

What is HbA1c?

HbA1c (glycated haemoglobin) measures your average blood sugar over the past 2–3 months. Unlike fasting glucose — which is a snapshot of one morning — HbA1c tells you the story of how your body has been processing sugar over time.

Think of it this way: fasting glucose is a photograph. HbA1c is a time-lapse.

The Ranges That Matter

• Below 5.7%: Normal. Your body is processing glucose well.
• 5.7% to 6.4%: Pre-diabetic. This is the range most people misunderstand. Your doctor might say "it's fine, just watch it." But this is your body telling you something is shifting.
• 6.5% and above: Diabetic range. Medical intervention is typically recommended.

Why 5.7% Is a Warning, Not a Pass

Here's what most doctors don't have time to explain in an 8-minute consultation: the difference between 5.4% and 5.7% might look small on paper, but it represents a meaningful change in how your body handles insulin.

If your HbA1c was 5.2% two years ago and it's 5.7% now, that's a trend — and trends matter more than any single number.

What Your Wearable Data Adds

Modern research shows that HRV (heart rate variability) correlates with metabolic health. If your HbA1c is trending up and your HRV is trending down, that's a signal worth paying attention to.

This is exactly the kind of connection that gets missed when your lab results and your wearable data live in separate worlds.

What You Can Do Today

1. Get your trend: Don't just look at today's number. Compare it to your last 2–3 tests. Is it stable, rising, or falling?
2. Check your sleep: Poor sleep quality directly impacts insulin sensitivity. If your wearable shows declining sleep scores, that could be contributing.
3. Walk after meals: A 15-minute walk after your largest meal can reduce post-meal glucose spikes by up to 30%.
4. Talk to your doctor with data: Instead of asking "is my HbA1c okay?", ask "here's my 3-year trend — should we discuss intervention?"

The Bottom Line

A single HbA1c number is information. Your HbA1c trend, correlated with your sleep, activity, and stress data, is intelligence. That's the difference between reacting to a diagnosis and preventing one.