Hemoglobin A1c 9.8 %: Is That High?

Is Hemoglobin A1c 9.8 % Low, Normal, or High?

HbA1c 9.8% is considered high and indicates that blood sugar has been poorly controlled over the past two to three months. The American Diabetes Association defines diabetes as HbA1c of 6.5 percent or above, and at 9.8% your average blood sugar has been significantly elevated. This result needs medical attention, but the important thing to know is that HbA1c can be brought down with the right combination of treatment and lifestyle changes.

An A1c level of 9.8% unequivocally signals poorly controlled diabetes, indicating persistently high blood glucose over the past two to three months, significantly exceeding the normal range of 4.0-5.6%. This elevated reading often points to either an established diabetes diagnosis where current medication regimens are insufficient or lifestyle modifications are not consistently followed, or, in many cases, an undiagnosed Type 2 diabetes that has progressed without any intervention. Such a value necessitates immediate and aggressive medical intervention to prevent or mitigate serious long-term complications like nerve damage, kidney disease, heart disease, and vision loss. Your healthcare provider will undoubtedly recommend further evaluations, including a fasting blood glucose test, a lipid panel, and kidney function tests, to assess the extent of potential organ involvement. Expect a referral to a diabetes educator for tailored dietary and activity guidance, and potentially an endocrinologist for specialized medication management. While this high A1c demands urgent attention, it also signifies substantial room for positive change; even a modest, consistent reduction in this number can dramatically decrease your risk of developing severe complications and often brings a noticeable improvement in daily energy levels and overall well-being as blood sugar levels stabilize.

Hidden Risk of Hemoglobin A1c 9.8 %

An HbA1c of 9.8% often does not cause dramatic symptoms day to day, which makes it easy to underestimate how much damage elevated blood sugar is doing over time. High glucose works quietly, and complications develop gradually before becoming obvious. The ADA stresses that bringing HbA1c closer to target significantly reduces the risk of long-term complications.

A Hemoglobin A1c of 9.8% significantly elevates the risk for serious microvascular and macrovascular complications due to prolonged exposure of tissues to high glucose. Specifically, the excessive glycation of proteins and lipids at this level accelerates the damage to small blood vessels in the eyes, kidneys, and nerves. This means a markedly increased likelihood of developing diabetic retinopathy, potentially leading to vision loss, nephropathy, which can progress to kidney failure, and neuropathy, manifesting as pain, numbness, and increased susceptibility to foot ulcers and infections. Furthermore, the inflammatory state promoted by persistent hyperglycemia at this level strongly predisposes individuals to cardiovascular events like heart attack and stroke by contributing to atherosclerosis.

• Every 1 percent reduction in HbA1c reduces the risk of microvascular complications (eye, kidney, nerve damage) by approximately 37 percent according to the landmark UKPDS study
• Persistent high blood sugar damages small blood vessels in the eyes, potentially leading to diabetic retinopathy, the leading cause of vision loss in working-age adults
• Nerve damage (neuropathy) that starts as tingling or numbness in the feet affects about half of all people with diabetes and worsens with prolonged elevated glucose
• Kidney disease risk increases significantly when HbA1c stays above target. The National Kidney Foundation reports that diabetes is the leading cause of kidney failure
• Heart disease and stroke risk are two to four times higher with diabetes, and poor glucose control amplifies this risk further

What Does a Hemoglobin A1c Level of 9.8 % Mean?

HbA1c measures how much glucose has bonded to the hemoglobin in your red blood cells over the past two to three months. Since red blood cells live about 90 to 120 days, this test captures a rolling average rather than a single moment.

An A1c result of 9.8% typically reflects consistent hyperglycemia over the past 2-3 months, most commonly driven by insufficient insulin action, either due to inadequate production or significant insulin resistance. Dietary factors are highly probable contributors, such as a sustained intake of high-glycemic index carbohydrates and excessive caloric consumption without corresponding physical activity. Non-adherence to prescribed diabetes medications, including oral agents or insulin therapy, or incorrect dosing, is also a primary consideration. Underlying conditions like undiagnosed or poorly controlled type 2 diabetes, or even advanced stages of type 1 diabetes with insufficient exogenous insulin, are the most likely diagnoses.

At 9.8%, your estimated average blood sugar has been roughly 183 mg/dL. To put that in context, the ADA target for most adults with diabetes is an HbA1c below 7.0 percent, which corresponds to an average blood sugar around 154 mg/dL. Your reading is about one full percentage point above that target.

What this tells you is that your body is not managing glucose effectively enough with your current treatment plan. Either you are producing too little insulin, your cells are highly resistant to the insulin being produced, or both. In type 2 diabetes, insulin resistance is usually the primary driver, often worsened by excess weight, inactivity, and dietary patterns. In type 1 diabetes, the issue is insufficient insulin production.

An HbA1c of 9.8% means that glucose has been spending too much time circulating in your blood at elevated levels. Over months and years, this excess glucose damages blood vessels and nerves throughout the body. The relationship between HbA1c and complications is well established: the higher and longer blood sugar stays elevated, the greater the risk.

Lifestyle Changes for Hemoglobin A1c 9.8 %

Lifestyle changes are essential for bringing HbA1c down from 9.8%, and they work alongside medication rather than replacing it. Exercise directly lowers blood sugar by moving glucose from the bloodstream into working muscles, and this effect persists for hours after the workout ends.

With an A1c of 9.8%, immediate, focused intervention is necessary. The highest yield lifestyle change involves a drastic reduction in refined carbohydrate and sugar intake, replacing them with non-starchy vegetables and lean proteins; aim to consistently consume less than 50 grams of net carbs daily. Schedule a follow-up appointment with your endocrinologist or primary care physician within two weeks to discuss medication adjustments, which may include initiating or intensifying insulin therapy. Track blood glucose readings at least four times daily, before and two hours after meals, to identify specific glucose spikes and inform treatment changes. A follow-up A1c test in three months is crucial to assess the effectiveness of these interventions.

The ADA recommends at least 150 minutes of moderate aerobic exercise per week. Walking, cycling, swimming, or any activity that raises your heart rate counts. Start where you are. If you are currently inactive, begin with 10-minute walks after meals and build gradually. Post-meal walking is particularly effective because it blunts the blood sugar spike that follows eating.

Weight management has a major impact on insulin resistance. Losing 5 to 10 percent of your body weight can meaningfully improve how your cells respond to insulin and lower HbA1c by 0.5 to 1.0 percentage points. For someone weighing 200 pounds, that is 10 to 20 pounds.

Strength training is valuable because muscle tissue actively absorbs glucose. Building muscle through resistance exercise gives your body more capacity to clear glucose from the blood. Two to three sessions per week complement aerobic exercise.

If you smoke, quitting is critical. Smoking increases insulin resistance, raises blood sugar, and accelerates every vascular complication that diabetes can cause. Sleep and stress management also matter. Poor sleep impairs insulin sensitivity, and chronic stress raises cortisol, which pushes blood sugar higher.

Written by

Ernestas K.

Clinical research writer specializing in human health, biology, and preventive medicine.

Reviewed against ADA, CDC, NIH, WHO, Mayo Clinic guidelines · Last reviewed March 20, 2026