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Understand your HbA1c result

Understand your A1c result, see why screening ranges differ, and build a practical starting plan for food and movement.

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Start with your report

Copy the exact test and unit. Use a decimal point if needed (3.8), and enter one thousand as 1000.

For Australia or another country, use your report and clinician's guidance. Screening bands help decide follow-up; they are not personal treatment targets.

Add report limits for context (optional)

Use limits printed on this report, in %. A laboratory range is not necessarily your personal treatment target.

For understanding and clinical discussion. No diagnosis, medication changes or supplement doses. If you feel acutely unwell, seek medical care.

Conceptual illustration of red blood cells and glucose exposure for an HbA1c result

What this result can tell you

HbA1c, also called A1c, reflects blood sugar over roughly the previous three months. It is not today's glucose reading. A screening range is a guide for discussion, not a diagnosis from one online entry.

Choose the right context

Screening ranges are different from treatment targets for someone who already has diabetes. Pregnancy, anaemia, some haemoglobin variants, recent blood loss or transfusion and certain illnesses can make A1c harder to interpret.

Different guidance can use different labels

US guidance starts its prediabetes range at 5.7%. Canadian guidance starts at 6.0%; UK high-risk guidance uses 42–47 mmol/mol. Follow your clinician's framework, including in Australia, New Zealand or Ireland.

Small, repeatable changes

Choose one achievable habit. A1c changes over time; a short-term change in routine cannot be translated into an exact future A1c here.

Food and everyday habits

These are general examples to adapt to your allergies, preferences and existing care plan. They do not predict a specific change in your result.

Start with your usual drink

A regular drink swap is often easier to repeat than changing every meal. Choose water or unsweetened tea instead of a usual sugary drink. Juice still contains carbohydrate. Source

Build a balanced plate

Vegetables, protein and a considered carbohydrate portion can make a familiar meal more balanced. Try vegetables, fish or chicken, and a portion of brown rice or another whole grain you like. Source

Keep useful food on hand

Planning one easy meal can help you avoid skipping meals or relying on whatever is available. Keep frozen vegetables, a suitable protein food and a whole-grain staple ready for a quick meal. Source

Common questions

Does one A1c result diagnose diabetes?

A clinician interprets the result with symptoms and other tests. Confirmation is often needed. This tool describes a screening band without diagnosing you.

Can I use this if I already have diabetes?

You can see the reported value and useful context, but screening labels are switched off. Use the individual target and medicines plan set with your diabetes team.

Should I cut out all carbohydrates?

This tool does not prescribe an extreme diet. Food quality, portions, preferences and existing treatment all matter. Ask for individual dietary advice when needed.

Check the evidence

The sources below support the explanations and rules. Their publishers do not endorse this tool.

  1. The A1C test and its limitations (opens in a new tab)

    NIDDK / NIH

  2. A1C testing and US screening ranges (opens in a new tab)

    CDC

  3. Screening for and diagnosing diabetes (opens in a new tab)

    Diabetes Canada

  4. HbA1c diagnostic criteria (opens in a new tab)

    Diabetes UK

  5. Pre-diabetes and HbA1c ranges (opens in a new tab)

    Ireland HSE

  6. Screening and diagnosis: current New Zealand guidance (opens in a new tab)

    NZSSD

  7. HbA1c unit conversion (opens in a new tab)

    NGSP

  8. Balanced meal planning (opens in a new tab)

    CDC

  9. Food and activity in blood-sugar management (opens in a new tab)

    CDC

Method

NGSP HbA1c (%) = IFCC (mmol/mol) × 0.09148 + 2.152. Screening bands use the original reported unit and the explicitly selected framework.

Preserve the reported number. Compare before rounding. Round converted units only for display; average complete BP pairs separately and round only at the end.