Do You Know What Your A1c Level Means? A Nurse Practitioner Explains
If you have type 2 diabetes or pre-diabetes, you have probably heard the phrase "your A1c" dozens of times. It gets drawn every few months, someone tells you the number, and the visit moves on. What often gets rushed in appointments is the part that actually matters: what the number is measuring, what can push it up or down, and what to do when it isn't moving the way you hoped.
After nearly 20 years as a nurse and Family Nurse Practitioner, I have seen a lot of patients who don’t know what their A1c tells them about their health. This post is the explanation I wish every patient got.
What an A1c actually measures
A1c (also written HbA1c, or hemoglobin A1c) measures how much of the hemoglobin in your red blood cells has glucose attached to it. Hemoglobin is the protein that carries oxygen, and when glucose is circulating in your blood, some of it binds to hemoglobin and stays there for the life of that red blood cell.
Red blood cells live roughly 90 to 120 days. That is why A1c reflects your average blood sugar over the past two to three months, with the most recent month weighing more heavily than the earlier ones. A single high-carb dinner will not move it. Months of elevated blood sugar will.
How A1c is used
A1c does three different jobs, and it helps to know which one your clinician is using it for.
1. Screening and diagnosis. The American Diabetes Association uses these ranges:
Below 5.7%: normal
5.7% to 6.4%: prediabetes
6.5% or higher: diabetes (usually confirmed with a repeat test)
2. Setting a target. For most non-pregnant adults with diabetes, the general goal is an A1c under 7%. That is a starting point, not a rule. Older adults, people with other serious conditions, and people prone to low blood sugar may have a looser target. Some younger, otherwise healthy people aim tighter. Your target should be a conversation, not a default.
3. Tracking treatment response. This is the job that gets the least attention, and it is the one I care most about. Once you are on a treatment plan, the single number matters less than the trend.
A falling A1c after starting or intensifying therapy tells you the plan is working. A flat or rising A1c despite treatment is a signal that something needs to change, and it usually points to one of three things:
The regimen is not strong enough yet. The medication or dose that made sense six months ago may not be enough now.
The diabetes itself is progressing. Type 2 diabetes is a progressive condition. Over time the pancreas produces less insulin, and a plan that once worked stops keeping up. This is not a personal failure. It is the natural history of the disease, and it calls for a different approach.
Taking the medication as prescribed has gotten hard. Cost, side effects, a confusing schedule, or simply life getting in the way. This is the most common reason and the least talked about.
Each of those has a completely different fix. "We'll recheck in three months" does not tell you which one you are dealing with.
What affects your A1c (beyond blood sugar)
Most of the time, A1c tracks your blood sugar closely. But there are situations where the number can be misleading, and if any of these apply to you, it is worth raising with your clinician.
Anything that changes red blood cell lifespan. Because A1c depends on red blood cells living their normal 90 to 120 days, conditions that shorten or lengthen that lifespan skew the result.
Iron deficiency and some other anemias can raise A1c, because older red blood cells hang around longer and accumulate more glucose.
Blood loss, hemolytic anemia, recent transfusion, and certain kidney or liver conditions can lower A1c, because red blood cells are being replaced faster than usual.
Pregnancy changes red cell turnover, which is one reason A1c is used differently in pregnancy.
Glucose variability. Two people can have the same A1c with very different day-to-day patterns. One might run steadily at 150. The other might swing from 70 to 250. The A1c looks identical, but the second person is at more risk. This is where a continuous glucose monitor can add information an A1c cannot.
Medications and illness. Steroids (prednisone, for example) raise blood sugar. So can some antipsychotics, certain diuretics, and a significant illness or infection. A temporary bump in A1c after a rough couple of months is worth interpreting in context.
Lifestyle, over months. Sleep, physical activity, stress, and the overall pattern of what you eat all move A1c, but slowly. This is good news and bad news. It means a bad week does not undo your progress. It also means you will not see the payoff from a change for two to three months, which is exactly when most people give up.
Why the number is not enough
Here is the pattern I see over and over. A patient gets an A1c of 8.2. Their clinician adjusts a medication, says "let's see where you are in three months," and the visit is over in ten minutes. Three months later the A1c is 8.1. The medication gets adjusted again. Repeat.
Nobody asked the important questions. Are you actually taking the medication every day, and if not, why? Is the side effect you mentioned last time still happening? Has your sleep changed? Did you stop walking when it got cold? Are your other labs (kidney function, lipids, thyroid, iron) telling a story that explains the A1c?
Those are the questions that separate a plan that works from a plan that gets adjusted every three months for years.
How I can help
I offer two services for people living with type 2 diabetes, and they address different problems.
Integrative Health Nurse Coaching
This is weekly, one-on-one work with a board-certified Family Nurse Practitioner. We focus on the things that move your A1c between lab draws:
What "adherence" actually looks like in your real week, and what gets in the way
Side effects that make you skip doses, and how to talk to your prescriber about them
Sleep, movement, stress, and eating patterns, built around your life rather than a generic handout
Reviewing each new set of labs together so you understand what changed and why
The difference between this and a general health coach is the credential. As an FNP, I can read your labs, interpret trends, and give you a clinical opinion on your medications. A coach without a license cannot.
Care Navigation
If the problem is bigger than one number, if you have several specialists who are not talking to each other, a medication list nobody has reviewed as a whole, insurance denials, or a diagnosis that still does not make sense, care navigation is the service for that. I review your full record, identify what has been missed, and help you walk into your next appointment with the right questions.
Many of my clients with diabetes use both: navigation to get the plan right, coaching to keep it moving.
The takeaway
Your A1c is a trend, not a grade. If it is falling, your plan is working. If it is flat or rising, something needs to change, and figuring out what is the whole game. You should not have to wait three months at a time to find out.
If you are in Colorado, Kentucky, or Washington and want help understanding your numbers and building a plan that fits your life, I offer a free 15-minute consultation. Book it here.
*This article is for general education and does not replace individual medical advice. Talk with your own clinician about your A1c target and treatment plan.
