For many patients, the A1C test is a number they’ve heard their doctor mention but never fully understood. They know it has something to do with blood sugar, and they know the results matter — but nobody has ever really sat down and explained what the test actually measures, why it’s different from the glucose reading on their home monitor, or what a specific result means for their health going forward. This gap in understanding isn’t a small thing. When patients don’t know what their A1C means, they can’t gauge how serious the situation is, they don’t know whether their management is working, and they lose the opportunity to make informed decisions about their own care.
The confusion around A1C is understandable. Unlike a blood pressure reading or a step count, A1C is a biochemical measure with no intuitive real-world equivalent. Patients receive a percentage in a lab report and are told it should be below 7%, but without context, that number doesn’t convey urgency, risk, or what needs to change. Some patients with an A1C of 8 or 9 feel perfectly fine and don’t understand why their physician is concerned. Others in the prediabetes range don’t realize they have a meaningful window of time in which the progression to type 2 diabetes can still be stopped — if they act on the information they’ve been given.
At Express Internal Medicine in Plano, TX, Dr. Iram Qureshi, DO makes A1C interpretation a central part of every diabetes management visit. Dr. Qureshi doesn’t just report the number — she explains what it means for your individual health, how it compares to previous results, and what specific changes in treatment or lifestyle will move it in the right direction. Patients leave each appointment understanding their results and feeling confident about their next steps.
What Does the A1C Test Actually Measure?
The A1C test — also called glycated hemoglobin or HbA1c — measures the percentage of hemoglobin proteins in your red blood cells that have glucose molecules attached to them. Because red blood cells live for approximately two to three months, the A1C gives a time-averaged picture of your blood sugar levels over that period. A higher A1C means that more hemoglobin molecules have been exposed to high levels of glucose — indicating chronically elevated blood sugar over the prior 2–3 months.
This is what makes A1C fundamentally different from a single fasting glucose measurement or a home monitor reading. A fasting glucose tells you what your blood sugar is doing at one specific moment. A1C tells you what your blood sugar has been doing consistently over a 90-day window — which is far more clinically meaningful for evaluating long-term diabetes control and risk.
How to Interpret Your A1C Results
A1C results fall into four clinical categories that correspond to different levels of blood sugar control and health risk:
Normal: Below 5.7%
An A1C below 5.7% indicates that blood sugar has been consistently within a healthy range over the past three months. This is the target range for people without diabetes, and it corresponds to an average blood glucose of approximately 117 mg/dL or lower.
Prediabetes: 5.7% to 6.4%
An A1C in this range indicates prediabetes — a condition in which blood sugar is higher than normal but not yet at the level that qualifies as type 2 diabetes. This is a critical window. Most patients who receive this result don’t realize how significant it is: without lifestyle changes or medical intervention, prediabetes progresses to type 2 diabetes in a meaningful percentage of patients within five years. The good news is that prediabetes is highly reversible with the right combination of dietary changes, physical activity, and physician guidance.
Diabetes: 6.5% or Higher
An A1C of 6.5% or above on two separate tests confirms a type 2 diabetes diagnosis. At this level, blood sugar has been elevated enough to significantly increase the risk of cardiovascular disease, kidney damage, neuropathy, and retinopathy over time. The management goal for most diagnosed diabetic patients is an A1C below 7%, though individualized targets are established based on age, comorbidities, and patient-specific factors.
Understanding the Average Blood Sugar Equivalent
A1C percentages can be converted to an estimated average glucose (eAG) value in mg/dL, which some patients find more intuitive. An A1C of 6% corresponds to an average glucose of approximately 126 mg/dL; 7% corresponds to approximately 154 mg/dL; 8% to 183 mg/dL; and 9% to 212 mg/dL. Each 1-point increase in A1C above 6% represents a meaningfully higher level of sustained glucose exposure and increased complication risk.
What Causes a High A1C?
- Insulin resistance: When cells stop responding normally to insulin, glucose accumulates in the bloodstream rather than being taken up for energy. This sustained elevation shows up directly in the A1C result and is one of the most common underlying drivers of elevated results in patients with obesity.
- Dietary patterns high in refined carbohydrates: Frequent consumption of foods that spike blood glucose — white bread, sugary beverages, processed snacks — keeps average blood sugar elevated over time, which is captured in the A1C. Dietary changes can produce measurable A1C improvements within 8–12 weeks.
- Physical inactivity: Exercise increases insulin sensitivity and improves glucose uptake in muscle tissue. Sustained physical inactivity has the opposite effect — it reduces the body’s ability to clear glucose from the bloodstream efficiently, contributing to chronically elevated blood sugar.
- Medication underperformance: As type 2 diabetes progresses, existing medications may no longer produce adequate blood sugar control. A rising A1C over successive tests — despite consistent medication use — is a clinical signal that treatment intensification is needed.
How to Lower Your A1C
Reducing A1C requires consistent changes across several areas simultaneously. Dietary restructuring — reducing refined carbohydrate intake and increasing fiber, protein, and healthy fats — produces some of the most rapid A1C improvements. Regular physical activity, even at moderate intensity, improves insulin sensitivity and glucose metabolism. When lifestyle changes alone are insufficient, Dr. Qureshi may adjust medication — including adding or changing oral agents, introducing GLP-1 medications, or initiating insulin therapy for patients with significantly elevated A1C. At Express Internal Medicine, the full diabetes management plan in Plano is built around achieving and maintaining A1C targets that are appropriate for each individual patient.
For patients whose elevated A1C is related to excess weight, achieving meaningful weight loss through a medical weight loss program can produce significant A1C reductions — because weight loss directly improves insulin sensitivity and reduces the pancreatic demand that drives blood sugar elevation.
Conclusion
Your A1C is one of the most informative numbers in your health profile — but only if you understand what it means and what to do with it. At Express Internal Medicine in Plano, Dr. Iram Qureshi ensures that every patient leaves their appointment with a clear understanding of their A1C, what it reflects about their health, and what comes next. If your A1C hasn’t been checked recently — or if a recent result left you with more questions than answers — schedule an appointment with Dr. Qureshi today.
Frequently Asked Questions
1. How often should I have my A1C tested?
Diabetic patients with stable, well-controlled blood sugar should have A1C tested every six months. Those with uncontrolled or recently changed diabetes management should be tested every three months.
2. Can A1C be inaccurate?
Yes. Certain conditions — including hemolytic anemia, sickle cell trait, iron deficiency, and recent blood transfusions — can affect the accuracy of A1C results. Dr. Qureshi considers these factors when interpreting results.
3. What is a normal A1C for someone without diabetes?
An A1C below 5.7% is considered normal. Anything between 5.7% and 6.4% indicates prediabetes; 6.5% or above confirms diabetes.
4. Does A1C vary by age?
A1C targets may be adjusted for older adults or those with multiple chronic conditions, where tight blood sugar control carries greater risk of hypoglycemia. Dr. Qureshi sets individualized targets based on each patient’s full health profile.
5. Can I reduce my A1C without medication?
Yes, particularly in prediabetes and early type 2 diabetes. Dietary changes, increased physical activity, and weight loss can produce meaningful A1C reductions — sometimes enough to bring levels back into the normal range without medication.
6. How quickly can A1C change?
A1C reflects a 2–3 month average, so meaningful changes take at least 6–8 weeks to appear in lab results. Consistent behavior and treatment changes can show measurable A1C improvement within one testing cycle.
7. What is the difference between A1C and fasting glucose?
Fasting glucose is a snapshot of blood sugar at a single moment. A1C is a 2–3 month average. Both provide useful information, but A1C is a more reliable indicator of long-term blood sugar control.
8. What A1C level requires insulin therapy?
There is no fixed threshold, but A1C levels persistently above 10% or rapidly worsening control despite oral medications often prompt consideration of insulin therapy. The decision is individualized by Dr. Qureshi based on the full clinical picture.
9. Can stress affect A1C results?
Chronic stress raises cortisol levels, which increases blood glucose and can elevate A1C over time. Stress management is therefore a legitimate part of diabetes management, not just a lifestyle preference.
10. Does Express Internal Medicine offer A1C testing at the office?
Yes. A1C testing is available through lab orders placed at Express Internal Medicine in Plano, with results typically available within a few business days and reviewed directly with Dr. Qureshi.
Disclaimer
This blog post is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. A1C interpretation and treatment decisions are individualized and should always be made in consultation with a licensed physician. Please consult Dr. Iram Qureshi at Express Internal Medicine for personalized guidance regarding your A1C and diabetes management.
Dr. Iram Qureshi is a dedicated board-certified Internal Medicine physician with a strong passion for preventative care and weight-loss management. With over five years of experience as a hospitalist, Dr. Qureshi has honed her expertise in treating acute medical conditions and focusing on preventing hospitalizations. She is committed to providing compassionate care and evidence-based guidance to help patients lead healthier lifestyles.
As the co-founder of Express Internal Medicine, Dr. Qureshi works alongside her husband, Dr. Adeel Khan, to create a welcoming and supportive environment for patients. She specializes in weight-loss management, offering personalized treatment plans aimed at achieving sustainable health outcomes. Dr. Qureshi holds degrees from Ohio State University and The University of Pikeville-Kentucky College of Osteopathic Medicine, with internal medicine training from Midwestern University OPTI in Sierra Vista, Arizona.
Fluent in English and Urdu/Hindi, Dr. Qureshi is passionate about educating her patients and empowering them to take charge of their health. Outside of her medical practice, she enjoys cooking, traveling, photography, and movies.
