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Where to start when a parent’s A1C is high
You are holding a result that belongs to somebody else, and there is a visit coming. That is an uncomfortable place to stand, and it is the place this article is written from. Before anything else: a high A1C is information for a conversation, not an instruction for you to act on.
Four reasons you might be reading this
Most people arrive here in one of four situations. Your parent has just been told a number is high for the first time and does not yet have a diagnosis. Or your parent already has diabetes and this result moved in the wrong direction.
Or you live somewhere else, saw the result in a portal or heard it on the phone, and cannot see the day to day. Or your parent does not want to discuss it with you at all.
All four are served below, and none of them requires you to interpret the percentage. If you want the mechanics of the test itself first, our guide to how an A1C result is read covers what the number is and how much it can move between draws.
One thing to leave to the care team
There is a single action worth ruling out before you read further, because it is the one that can do harm this week.
⚠️ Clinical Warning: Do not change, skip, split or space out a parent’s diabetes medicine on the strength of a lab result — not if the number looks high, and not if it looks reassuring. Medicines that lower blood glucose are adjusted against a whole clinical picture, including kidney function, other prescriptions and how often lows are happening. That adjustment belongs to the clinician who prescribed them.
If you are here because a parent’s diabetes affects your risk
Some readers arrive with a different question: a parent has diabetes, so what does that mean for me? That is a real question and a different one. Having a parent or sibling with type 2 diabetes is one of the recognized reasons an adult may be advised to get tested earlier, and it is worth raising at your own appointment rather than your parent’s.
This article stays with the first question. If you are working through several of a parent’s results at once, our guide to reading a parent’s other blood tests covers the wider panel.
ℹ️ Medical Disclaimer: This article is general education about a laboratory result and about preparing for a medical appointment; it does not diagnose any condition, and it does not recommend, start, stop or adjust any medication, insulin regimen, monitoring device or treatment plan. Diagnosis, medication decisions, glucose targets and monitoring plans are set by the clinician who treats your parent, and questions about insurance coverage belong to the plan. Ask a board-certified primary care physician, geriatrician or endocrinologist before acting on anything here.
What a high A1C says about the last three months
The A1C is an average. It estimates what blood glucose has been doing across roughly the previous three months, which is why a single high result describes a season rather than a moment.
Why it is an average, not a reading
🔬 How It Works: Glucose in the bloodstream attaches to hemoglobin, the protein that carries oxygen inside red blood cells. The more glucose has been circulating, the greater the share of hemoglobin carrying it. Because red blood cells are replaced over roughly three months, the test reflects that whole window rather than the morning of the draw — which is also why it cannot be moved by skipping breakfast beforehand.
The Centers for Disease Control and Prevention describes what the A1C test measures in the same terms, and adds something this article returns to repeatedly: the test does not replace knowing how blood glucose behaves across a day.
What a high result usually leads to next
A first high result in someone without a diagnosis is usually the start of a process rather than the end of one. A second blood test on a different day is commonly used to confirm a diagnosis before anyone is told they have diabetes, a step the National Institute on Aging describes on its own patient page.
If that is your parent’s situation, our guides to why a second test is done and what usually happens after a high result set out the sequence. For a parent who already has diabetes, a higher number is a prompt to review the plan, not evidence that anything has been done wrong.
When the number itself might not be right
Several conditions and situations can push an A1C higher or lower than the underlying glucose would suggest, and some of them are more common with age. That is a question for the care team rather than a reason to dismiss the result. Our guide to how accurate the A1C test is explains what the laboratory has to demonstrate and where the genuine uncertainty sits.
The lows an average can hide
Here is the part that matters most and that almost nothing written for families says out loud. An average can conceal the extremes it is made of, and in an older adult the extreme that gets missed is usually low blood glucose.
Why two very different weeks can average out
Think about what an average does. A steady fortnight and a wildly swinging fortnight can produce the same middle number, because the highs and the lows cancel each other in the arithmetic. The CDC states this plainly on its own A1C page: the test estimates average blood sugar, and it may not account for spikes or lows.
That is not a flaw in the test. It is what an average is for, and it is why a result can look acceptable while a week has been anything but. If your parent’s meter readings and their A1C seem to tell different stories, our guide to when an A1C does not match the meter explains why both can be right at once.
What low blood sugar looks like in an older adult
The CDC’s guidance for family helping someone with diabetes makes the point directly: older people may be less able to notice high or low blood glucose themselves, so it is especially important that the person helping them knows the signs.
Those signs are easy to file under personality or aging. The CDC’s list includes shakiness, sweating, chills or clamminess, irritability and impatience, dizziness and difficulty concentrating, hunger or nausea, blurred vision, weakness or fatigue, and anger, stubbornness or sadness. Signs vary from person to person, which is why knowing your parent’s particular pattern is worth more than knowing the list.
The episodes nobody is awake for
Low blood glucose can also happen during sleep and last for hours. The National Institute of Diabetes and Digestive and Kidney Diseases notes that a person may not wake or notice any symptoms at all, and that the signs can be crying out or nightmares, sweating enough to leave pajamas or bedding damp, and waking tired, irritable or confused.
Read that list again as somebody who does the laundry. These are observations a family member can make and a patient genuinely cannot self-report.
It is also worth knowing that goals for older adults are set individually rather than by age alone — our guide to how A1C goals are set after 65 covers how, and why a looser goal never means a high result stops mattering. For the day-to-day pattern an average cannot show, what time in range measures is the companion piece.
What you saw that the number could not
The visit will have the percentage. What it will not have is the fortnight you watched, and that is the thing only you can bring. The useful contribution here is observation, not conclusion.
Observations, not conclusions
There is a real difference between “she seemed confused on Tuesday afternoon, twice, before lunch” and “I think her sugar is dropping.” The first is evidence a clinician can work with. The second is a diagnosis you are not in a position to make, and it can send a conversation off in the wrong direction.
Write down what happened, when it happened and how often. Leave the interpretation in the room where it belongs.
| What the A1C shows | What only you can add |
|---|---|
| An average across about three months | Which days were unlike the others |
| One number, taken once | Meals skipped, delayed or halved |
| No information about timing | The time of day things go wrong |
| No information about swings | Episodes of confusion, sweating or unsteadiness |
| Nothing about the nights | Damp bedding, nightmares, waking confused |
| Nothing about daily life | How many medicines there are, and how hard they are to keep track of |
Rows in the right-hand column reflect observations described in CDC and NIDDK patient guidance cited in this article.
A week worth writing down
A week is enough. Note anything that looked out of character, meals that were skipped or cut short, and any spell of unsteadiness, sweating or confusion. Note the time of day each one happened, because timing is often the most useful detail a family member supplies.
✅ Patient Action: Take one week of dated notes to the appointment and hand them to the clinician who manages your parent’s diabetes, then ask directly: “Do any of these look like low blood glucose episodes to you?” That is a question a primary care physician, geriatrician or diabetes nurse educator can act on immediately.
If your parent’s result was not just high but well outside the usual range, our guide to when a result is very high explains what tends to follow.
If you live too far away to watch
Plenty of adult children are three time zones from the person they are worried about, and a page that assumes daily presence is useless to them. You can still ask specific questions on a call: how did this week’s meals go, has there been any dizziness, has anything felt different in the afternoons.
The National Institute on Aging suggests that people at a distance discuss with the doctor how to stay up to date, and that access to records can help — with the person’s permission. Pass on what you notice, and say where it came from.
What to ask, and what you will be asked
Most articles about a parent’s appointment stop at a list of questions to ask. That is half of it. Current diabetes guidance for older adults expects the care team to seek information from the people around the patient, which means you may be asked as much as you ask.
Three questions worth asking
Keep them answerable inside a short appointment, and keep them about what is being watched rather than what should be prescribed.
- What are we monitoring between now and the next visit, and what would tell us the plan needs revisiting?
- Has my parent been screened for anything that could make managing this harder day to day?
- Who do we call between appointments, and what counts as worth calling about?
The last one matters more than it looks. If you want to understand the retest rhythm before you go, our guide to how often the test is repeated sets out the usual cadence.
What the care team may ask you
🩺 Editor’s Note: Current guidance for older adults with diabetes points clinicians toward regular screening for low blood glucose and for the conditions that make self-management harder — including memory and mood changes, falls and the sheer number of medicines someone is taking — and toward discussing what they find with the patient and the people helping them. A family member’s observations are not an intrusion into that conversation. They are one of its inputs.
The National Institute on Aging’s page on diabetes in older people notes that a doctor may screen for depression or cognitive impairment, because both are more common alongside diabetes and both make daily self-care harder. If you have noticed either, that is worth saying out loud.
Whether to be in the room at all
Going along is the parent’s decision, not yours. The CDC frames it as something to do if it is all right with them, and that condition is the whole of it. If the answer is no, a written note handed over beforehand still gets your observations into the record.
Where helping starts to get in the way
You searched for how to help, so this section will be uncomfortable: part of the honest answer is to do less of some things. Support from family is among the strongest predictors of how well someone manages diabetes, and it stops working the moment it becomes management.
Speaking for someone who can speak
The National Institute on Aging’s guidance on taking someone to a doctor’s appointment is unusually direct about this, and all three of its points are worth carrying in.
- When the doctor asks a question, let your parent answer, unless you have been asked to answer instead.
- It is easy to slide into a two-way conversation between you and the doctor. Try not to; keep your parent in it.
- Respect their privacy and leave the room when they ask you to.
That same page sets out how permission to speak with a parent’s clinicians actually works, which is a question in its own right. Our companion piece on asking about a parent’s results works through the permission side in detail.
Blame is not a treatment
A high number is the most common trigger for an adult child to arrive at a visit angry about a parent’s diet. The CDC addresses this squarely: excess weight is only one of several factors in type 2 diabetes, and blood glucose can be hard to manage even with careful eating and regular activity.
Each person’s plan has to fit their circumstances, and a result that moved is information about the plan, not a verdict on the person following it.
When a parent does not want the help
Ask how you can help, then listen to the answer — and accept that it may be “not with this.” The CDC’s guidance makes the point that someone may want reminders and assistance, or may not, and that what they want can change over time.
Your parent may simply not wish to share everything about managing their diabetes with you. Staying available is not the same as staying out, and it is usually the version that lasts.
What this page cannot tell you
Some limits here are deliberate, and saying so is more useful than pretending the page is complete.
Why we do not print a number here
You will notice this article contains no A1C percentage, no glucose value and no target. That is a choice. A threshold read off a web page cannot be applied to a person nobody here has examined, and a number in a caregiver’s hands is a number that gets used to score somebody else’s body from a printout.
Your parent’s goal is set with their clinician, against their other conditions and their other prescriptions. Asking what their goal is and why is a better use of the visit than arriving with one.
What we will not recommend, and why
We take no commission on this page and recommend no product, and each refusal has a reason drawn from the sources above.
- Home A1C kits. A result from a pharmacy, health fair or home kit is a prompt to see a doctor, not a diagnosis. Our guide to fingerstick A1C at the clinic covers what these devices are cleared to do.
- Continuous glucose monitors. These can genuinely help some older adults, and they involve a prescription and a clinical judgment about hypoglycemia risk. That is a conversation for your parent and their clinician, not a purchase made by a worried relative.
- Supplements sold for blood sugar. Nothing in the federal guidance cited here supports buying one, and a page that sells you one while your parent’s plan is under review is not helping.
If something is happening now
⚠️ Clinical Warning: Severely low blood glucose is an emergency: if your parent is confused, unresponsive, having a seizure or unable to swallow safely, call 911. NIDDK’s page on what to do about low blood glucose explains that families can be taught in advance when and how to give glucagon, which a doctor prescribes, and to call 911 immediately after giving it or if no kit is available. Ask your parent’s clinician whether a kit is appropriate and who should be shown how to use it — before it is needed.
Questions families ask about a parent’s A1C
1. Does a high A1C mean my parent has diabetes?
Not on its own. When a parent’s A1C is high for the first time, a second blood test on a different day is commonly used to confirm a diagnosis before anyone is told they have diabetes. If your parent already has diabetes, a higher result is a prompt to review the plan with their clinician rather than a new diagnosis.
2. Can an A1C look fine when blood sugar is not?
Yes. The A1C is an average, and the CDC notes it may not account for spikes or lows. A steady period and a swinging one can produce a similar middle number, which is why a parent’s A1C can look acceptable while their week has included episodes worth reporting to their care team.
3. What should I write down before my parent’s appointment?
A week is enough when a parent’s A1C is high. Note anything out of character, meals skipped or cut short, spells of unsteadiness, sweating or confusion, and disturbed nights, recording the time of day each happened — timing is often the most useful detail a family member supplies. Record what you saw, not what you concluded from it.
4. Will the doctor talk to me about my parent’s results?
Only with your parent’s agreement. Verbal permission at the visit covers the conversation in the room, and offices hold a consent form for wider access. Where a parent’s A1C is high and you cannot attend, a written note handed over beforehand still gets your observations in front of the care team.
5. What are the signs of low blood sugar in an older person?
The CDC lists shakiness, sweating or chills, irritability, dizziness and difficulty concentrating, hunger or nausea, blurred vision, weakness, and anger, stubbornness or sadness. Signs differ between people, and an A1C average will not show them. Older adults may be less able to notice them, which is why someone close by knowing your parent’s own pattern matters so much.
6. Should I go to my parent’s appointment?
That is their call. The CDC frames attending as something to do if it is all right with them. If your parent’s A1C is high and they would rather go alone, you can still write down what you have noticed and ask them to hand it over, which keeps your observations useful without taking the visit over.
7. My parent will not discuss it. What can I do?
Ask how you can help and accept the answer, including “not with this.” Someone may want reminders or may not, and what they want can change. A parent whose A1C is high still gets to decide how much of managing it they share, and staying available generally outlasts pressing the point.
8. Is a high A1C my parent’s fault?
No. The CDC is clear that excess weight is only one of several factors in type 2 diabetes, and that blood glucose can be hard to manage even with careful eating and regular activity. Treating a parent’s high A1C as a verdict on their behavior tends to end the conversation you actually need to have.
9. Does a parent’s diabetes raise my own risk?
Having a parent or sibling with type 2 diabetes is one of the recognized reasons an adult may be advised to be tested earlier than usual. Your parent’s high A1C is their result, though, and the place to raise your own risk is your appointment rather than theirs. Ask your primary care physician whether testing is appropriate for you.
10. Can I ask about changing my parent’s medicine?
You can ask questions; you should not make changes. Never alter, skip or space out a parent’s diabetes medicine because their A1C is high or because it looks reassuring — those decisions rest with the prescribing clinician, who weighs kidney function, other prescriptions and how often lows occur. Ask what would prompt a change and what to watch for.
11. I live far away. What can I still do?
A great deal, even though you cannot watch the week a parent’s A1C summarizes. Ask specific questions on calls: how meals went, whether there has been dizziness, whether afternoons feel different. The National Institute on Aging suggests discussing with the doctor how someone at a distance can stay informed, and that access to records may help, with your parent’s permission.
Bring the week, not a verdict
If you take one thing from this page, take the difference between the number and the week. The percentage is an average of a season, and it is the care team’s to interpret. The fortnight you watched is yours, and nobody else in that room has it.
So write down what you saw, hand it over, and let your parent answer for themselves. Ask what is being monitored and who to call. And leave every decision about medicine with the clinician who prescribed it — including on the days when doing something feels better than doing nothing.
Noticing is not a small contribution. For many families it is the one that changes what happens next.
About this content
How this article was put together: researched from recognised health sources, drafted with the help of AI tools, and edited by hand, with sources linked throughout.
Sameer Patel is the founder and editor of My Medicine Advisor. He is not a doctor or medical professional — before starting this site he worked in banking,…
Medical disclaimer
The content on MyMedicineAdvisor is provided for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Health information on this website should not be used to diagnose, treat, cure, or prevent any condition without guidance from a qualified healthcare professional. Always seek the advice of your doctor, physician, or another licensed healthcare provider with any questions you may have regarding a medical condition, symptoms, medications, or treatment decisions.
