HbA1c Explained: Normal Range, What 5.6% Means, and Prediabetes

You open your lab report, scroll past the cholesterol panel, and find a line that says HbA1c: 5.6%. There is no red flag beside it. Nothing is marked "high." And yet the number sits there, quietly, and you have no idea whether it is good news.

This matters more here than in most places. The International Diabetes Federation estimates that 20.7% of adults in the UAE were living with diabetes in 2024, around 1.27 million people.² More striking is what happens before diagnosis: 64% of adults with diabetes in the UAE do not know they have it, and an estimated 1.3 million more sit in the impaired fasting glucose range.²

HbA1c is the single most useful test for finding those people early. Here is how to read yours.

Important: This article is for general education and does not replace medical advice. Laboratory results should always be interpreted by a licensed physician in the context of your individual history and examination.

What HbA1c actually measures

Glucose in your bloodstream binds to haemoglobin, the oxygen-carrying protein inside your red blood cells. That binding is slow, permanent, and proportional. The more glucose circulating, the more of your haemoglobin gets coated with it. The coated fraction is called glycated haemoglobin, or HbA1c.

Red blood cells live roughly 120 days. Because your sample contains cells of every age, from brand new to nearly expired, the HbA1c result reflects your average blood glucose over the previous two to three months. Recent weeks carry more weight than older ones, so the last four weeks influence the result more than the third month back.

Two practical consequences follow from this:

• You do not need to fast. Breakfast this morning will not move the number. This is the main advantage HbA1c has over a fasting glucose test.
• You cannot cram for it. Eating carefully for three days before your blood draw changes almost nothing. The test sees the whole quarter.

HbA1c normal range: the full chart

The diagnostic thresholds below come from the American Diabetes Association's 2026 Standards of Care and are used by clinicians across the UAE. Prediabetes is defined by an HbA1c of 5.7% to 6.4% (39 to 47 mmol/mol).¹

Two notes on reading this table.

Units. Some labs in Dubai report HbA1c as a percentage (the NGSP/DCCT convention), some as mmol/mol (the IFCC convention), and many report both. They are the same measurement expressed differently. If your report says 38 mmol/mol, that is 5.6%.

One result is not a diagnosis. An HbA1c of 6.5% or higher needs to be confirmed, either by repeating the test or by a second abnormal test such as fasting plasma glucose, before diabetes is diagnosed.¹ The exception is someone with obvious symptoms and a clearly high random glucose. Your doctor makes that call, not the report.

So what does an HbA1c of 5.6% mean?

Technically, 5.6% is normal. It falls below the 5.7% prediabetes threshold, and no clinician will diagnose you with anything on the strength of it.

Practically, 5.6% is the last stop before the line.

Your estimated average glucose

HbA1c converts to an estimated average glucose (eAG) using a validated formula.⁵ At 5.6%, your average blood sugar over the past three months worked out to roughly 114 mg/dL, or 6.3 mmol/L. For comparison, an HbA1c of 5.0% corresponds to about 97 mg/dL (5.4 mmol/L).

The margin of error nobody mentions

Laboratory assays have measurement variation. The joint ADA and ADLM laboratory guideline sets the target for HbA1c imprecision at an intra-laboratory coefficient of variation below 1.5% and an inter-laboratory CV below 2.5%.⁸ Even a lab hitting those targets carries a real spread, and normal biological variation adds a little more on top.

In plain terms: if you gave two tubes of blood on the same morning, one could read 5.5% and the other 5.7%. A result of 5.6% is close enough to the prediabetes cutoff that it should be treated as a signal, not a clean pass.

What 5.6% should prompt you to do

• Repeat it in 6 to 12 months rather than waiting the standard three years. You are watching a trend, not a snapshot.
• Compare it to your last result. A move from 5.2% to 5.6% over two years is more informative than either number alone. If you have old reports, dig them out.
• Look at the rest of the panel. Waist circumference, triglycerides, HDL cholesterol, blood pressure, and liver enzymes tell you whether insulin resistance is already at work.
• Act now, because it is cheapest now. Reversing a 5.6% is considerably easier than reversing a 6.2%.

If 5.6% came with a family history of type 2 diabetes, a BMI above 25, gestational diabetes in a previous pregnancy, or South Asian, Arab, or East Asian ancestry, treat it as an early warning rather than a normal result.

In Dubai, HbA1c on its own is AED 45 at Intel Lab. The Diabetics Profile pairs it with a fasting glucose for AED 89, which gives you the snapshot and the three-month average from one sample.

Prediabetes: the stage most people miss

Prediabetes means your blood glucose is consistently higher than normal but has not reached the diabetes threshold. On HbA1c, that is 5.7% to 6.4%.

It has no symptoms. No thirst, no fatigue, no frequent urination. This is the entire problem. The only way to find it is to test for it, which is why so much of it goes undetected.

What happens if it is left alone

Without intervention, a meaningful proportion of people with prediabetes progress to type 2 diabetes each year. The risk is not evenly spread: someone at 6.3% with central obesity and a strong family history is on a much faster track than someone at 5.8% who is lean and active.

Prediabetes also carries its own cardiovascular risk. The damage to blood vessels and nerves does not politely wait for you to cross the 6.5% line.

The genuinely good news

Prediabetes responds to intervention better than almost any other condition in medicine. In the landmark Diabetes Prevention Program trial, a structured lifestyle programme targeting 7% weight loss and at least 150 minutes of physical activity per week cut progression to type 2 diabetes by 58% over an average follow-up of 2.8 years.⁶ In participants aged 60 and older, the reduction was 71%.⁷ Metformin reduced risk by 31%.⁶

That is a larger effect than most drugs produce for most conditions, and it is available to anyone reading this.

When HbA1c gives the wrong answer

HbA1c depends on red blood cells behaving normally. When they do not, the result can mislead. This is worth understanding in the UAE, where iron deficiency and inherited haemoglobin conditions are both common across the resident population.

Conditions that can push HbA1c falsely high:

• Iron deficiency and iron deficiency anaemia. A systematic review found that iron deficiency can produce a spuriously elevated HbA1c, potentially causing a false positive diagnosis of diabetes.¹⁰ Correcting the deficiency brings the number back down.
• Vitamin B12 deficiency
• Advanced chronic kidney disease
• Splenectomy

Conditions that can push HbA1c falsely low:

• Haemolytic anaemia and any condition shortening red cell survival
• Recent significant blood loss or blood transfusion
• Advanced liver disease
• Erythropoietin therapy
• Late pregnancy

Haemoglobin variants including sickle cell trait, beta thalassaemia trait, HbC, HbD, and HbE can interfere with certain HbA1c assay methods.⁸ Modern HPLC and immunoassay platforms handle most variants well, and a good laboratory will flag an abnormal chromatogram and switch methods or recommend an alternative test.

Tell your doctor and your lab if you have known anaemia, a haemoglobin trait, kidney disease, or a recent transfusion, or if you are pregnant. If HbA1c is unreliable in your case, fasting glucose, an oral glucose tolerance test, or fructosamine can be used instead. A ferritin test alongside your HbA1c is the simplest way to rule iron deficiency in or out.

Who should be tested, and how often

Current guidance from the American Diabetes Association:¹

• Screening should begin at age 35 for adults without risk factors, and be repeated at least every 3 years if results are normal.
• Test earlier and more often if you have a BMI of 25 or above (23 or above for people of South and East Asian descent) plus at least one additional risk factor.
• If you already have prediabetes, test at least annually.

Risk factors that should move you up the queue:

• A first-degree relative with type 2 diabetes
• High-risk ethnicity, which includes South Asian, Arab, and East Asian populations
• Previous gestational diabetes, or a baby weighing over 4 kg at birth
• Polycystic ovary syndrome
• Hypertension, low HDL cholesterol, or high triglycerides
• Physical inactivity
• Fatty liver disease
• Known cardiovascular disease

Given the prevalence figures at the top of this article, most working-age adults in Dubai have at least one of these.

What to do with your number

The bottom line

HbA1c below 5.7% is normal, 5.7% to 6.4% is prediabetes, and 6.5% or above falls in the diabetes range pending confirmation. A result of 5.6% clears the bar, but only just, and in a population where one in five adults has diabetes and most of them do not know it, "only just" is worth paying attention to.

Test once and you have a number. Test regularly and you have a trajectory, which is the thing that actually predicts what happens next.

Book an HbA1c test at Intel Lab. No fasting, results within 24 hours, and free home collection across Dubai, 7 days a week. Intel Lab is licensed by the Dubai Health Authority.