November is Diabetes Awareness Month, so let's talk about the lab most likely to be quietly changing in your chart right now: hemoglobin A1C.
Here's a pattern I see again and again. A woman lines up three years of labs: A1C 5.5%, then 5.7%, then 5.9%. Every result was filed as "fine" no single one crossed a line that triggered a conversation. But those three numbers together tell a very different story than any one of them alone.
What A1C actually measures
A1C is a blood test that reflects your average blood sugar over roughly the past three months. Unlike a fasting glucose, which is a single moment on a single morning, A1C shows the pattern your body has been living in.
The ranges:
Normal: below 5.7%
Prediabetes: 5.7% to 6.4%
Diabetes: 6.5% and above
Prediabetes isn't a warning label to be scared of. It's information and caught here, it's the stage where change is most possible.
One result is a snapshot. The trend is the story.
A single A1C of 5.6% looks reassuring. But if it was 5.2% three years ago, that number is telling you something important: your blood sugar regulation is slowly working harder than it used to.
This is why comparing against last year's result matters as much as comparing against the reference range. A "normal" that's climbing year after year is your earliest, clearest signal, arriving years before anything would cross into a diagnosis.
You can't feel it, and that's the point
Here's what surprises most women: a rising A1C usually causes no symptoms at all. Energy feels normal. Nothing hurts. Most women feel absolutely nothing while the number quietly climbs.
That's not a reason to panic. It's a reason to look. The change is happening at the level of labs, where you can only see it if you check.
Why midlife is when the creep starts
As estrogen declines in perimenopause, insulin sensitivity declines with it. Your body needs more insulin to do the same job, and over time blood sugar averages edge upward. Sleep disruption, stress, and muscle loss all push in the same direction.
This isn't a personal failure, it's physiology. But physiology you can measure is physiology you can work with.
It's not just about blood sugar, it's about your heart
A drifting A1C rarely travels alone. Rising blood sugar and rising cardiovascular risk move together: the same insulin resistance that pushes A1C up also nudges triglycerides up, HDL down, and blood pressure higher. That's why A1C belongs in a cardiometabolic picture, not a silo. Your heart is part of this story too.
The labs that pair with A1C
A1C is powerful, but it tells a fuller story alongside a few partners:
Fasting glucose: the single-morning snapshot
Fasting insulin: often rises years before glucose does, making it an earlier warning sign
Lipid panel, especially triglycerides and HDL: the cardiovascular side of the same picture
Blood pressure: the fifth piece of the metabolic puzzle
Together, these show not just where your blood sugar is, but how hard your body is working to keep it there.
What to do with a creeping number
Get your trend. Ask for your A1C results from the last few years and line them up. Direction matters more than any single value.
Don't wait a full year to recheck if your number is in the upper 5s, a six-month interval shows whether your changes are working.
Work the levers that move insulin sensitivity: strength training to protect muscle, a short walk after meals, protein at breakfast and lunch to steady the day, and sleep you actually protect.
Make a plan, not a guess. A number moving in the wrong direction deserves a clinician-guided strategy and follow-up labs to prove it's turning around.
The bottom line
One "normal" result is a snapshot. Three are a story. If your A1C has been quietly climbing while you feel fine, that's not bad news it's early news, and early is exactly when this number is easiest to change.
In my practice, every Cardiometabolic Reset checks A1C and its partner labs at the start, the midpoint, and the end of the six months because we don't just want a plan, we want proof it's working.
Curious what your own trend looks like? That's exactly what we talk about in a discovery call.
