HbA1c Analyser: Methods, Units and When the Result Misleads

HbA1c is the diabetes number most Malaysian clinics check every few months. How analysers measure it, why the method matters where HbE and thalassaemia are common, and what to check before buying.

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Also called HbA1c analyser, HbA1c machine, HbA1c test, Glycated haemoglobin

Last updated: 11 October 2026

What HbA1c measures

Glucose attaches slowly and permanently to haemoglobin inside red cells. HbA1c is the share of haemoglobin A carrying glucose on the end of its beta chain, and because a red cell lives about 120 days, it reflects average blood glucose over roughly the previous two to three months. It is measured on EDTA whole blood, needs no fasting and runs on its own analyser — a haematology analyser does not measure it.

Monitoring

The routine review number for people with diabetes, usually every three to six months depending on control and treatment changes.

Diagnosis

Also used to diagnose type 2 diabetes and prediabetes, provided the method is standardised and nothing about the patient makes HbA1c unreliable.

Not a glucose reading

It cannot show hypoglycaemia, day-to-day swings or a very recent change, so it complements finger-prick or continuous glucose readings rather than replacing them.

Four common methods, and why the method matters

Methods certified by the NGSP agree closely on ordinary samples. Where they differ is in how they behave when the patient carries a haemoglobin variant.

Method	How it works	Where you meet it	Haemoglobin variants
Ion-exchange HPLC	Separates haemoglobin fractions by charge and measures the HbA1c peak	Dedicated laboratory HbA1c analysers	The chromatogram often reveals an unexpected variant, but some variants overlap the HbA1c or HbA0 peak and bias the result
Immunoassay	An antibody recognises the glycated end of the beta chain; the reaction is read by turbidimetry	Chemistry analysers and many point-of-care devices	The variant itself is not seen; interference depends on the variant and the assay
Boronate affinity	Binds glycated haemoglobin of every kind and reports an HbA1c-equivalent value	Some point-of-care devices and HPLC systems	Least affected by variants, though still affected by red-cell lifespan
Capillary electrophoresis	Separates haemoglobin fractions in an electric field	Laboratory systems, often also used for thalassaemia work-up	Separates and shows many common variants

Percent or mmol/mol?

HbA1c is reported in two units. The percentage (NGSP or DCCT units) comes from the US diabetes trials; mmol/mol (IFCC units) comes from the international reference method. Many Malaysian reports print both. To convert: mmol/mol = (% − 2.15) × 10.929.

NGSP (%)	IFCC (mmol/mol)	Where you may see it
5.7	39	Start of the prediabetes range in common guidelines
6.3	45	Diagnostic cut-off in Malaysia’s clinical practice guidelines on type 2 diabetes
6.5	48	Diagnostic cut-off used by the WHO and the American Diabetes Association
7.0	53	A common treatment target, set individually by the doctor
8.0	64	A less strict target sometimes set for older or frail patients

When HbA1c can mislead

HbA1c assumes normal haemoglobin and a normal red-cell lifespan. When either is untrue, the number drifts away from the real glucose level and doctors fall back on glucose testing, fructosamine or glycated albumin. In Malaysia, where HbE and thalassaemia traits are common, an HbA1c that does not fit the glucose readings is a reason to look for a variant.

Situation	Usual effect	Why
Haemoglobin variants, including HbE trait	Higher or lower, depending on the method	The variant changes how haemoglobin separates or binds; check the method’s variant data
HbH disease, thalassaemia major or homozygous HbE	Unreliable	Abnormal haemoglobin, shortened red-cell survival and often transfusion
Iron deficiency anaemia	May read higher	An older red-cell population; HbA1c can fall once iron is replaced
Haemolysis, recent bleeding or transfusion	Falsely low	Younger red cells, or donor cells, have had less time to glycate
Pregnancy	Lower	Faster red-cell turnover; gestational diabetes is diagnosed with glucose testing
Advanced chronic kidney disease or dialysis	Unreliable, often low	Anaemia, shortened red-cell survival and treatment with erythropoietin
Raised fetal haemoglobin (HbF)	Higher or lower, depending on the method	HbF is not measured as HbA1c and can overlap chromatogram peaks

Point-of-care or laboratory HbA1c?

	Point-of-care HbA1c analyser	Laboratory HbA1c analyser
Sample	A few microlitres of finger-prick blood into a single-use cartridge	Venous EDTA whole blood, often sampled straight from the tube
Result timing	A few minutes, during the consultation	Minutes per sample on site; same or next day when the sample is sent out
Throughput	One sample at a time	Racks of samples, often with an autoloader
Variant information	Usually none	HPLC and electrophoresis chromatograms can reveal variants
Cost model	Paid per cartridge, with no daily start-up	Reagent, column and calibrator costs that suit higher volumes
Typical buyer	GP clinics with a steady diabetes caseload	Hospital and private laboratories, large polyclinics

Quality control, EQA and buying checks

An NGSP-certified method traceable to the IFCC reference. Certification is renewed every year, so check it is current for the exact analyser and reagent.
Whether the maker states the device is intended for diagnosis or only for monitoring — and follow your clinical practice guidelines on which results can be used to diagnose.
The maker’s published interference data for HbE, HbS, HbC, HbD and raised HbF. HbE matters most in Malaysia.
Two levels of control at the interval the maker sets, plus a check with each new cartridge or reagent lot, recorded like any other QC.
An external quality assessment (EQA) scheme that includes HbA1c, so your results are compared with other laboratories.
Cartridge or reagent shelf life and storage temperature, set against how many tests you really run each month.
MDA registration for the analyser and every cartridge or reagent.

Hematology Analyser supply near you

Delivery, installation and training across Malaysia from Batu Caves, Kota Kinabalu and Kuching.

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Frequently asked questions

Can HbA1c be run from the same EDTA tube as the FBC?

Usually yes. Most HbA1c methods use EDTA whole blood, so one purple-top tube can serve both tests — but HbA1c runs on a separate HbA1c, chemistry or point-of-care analyser, not on the haematology analyser.

What is an HbA1c of 7% in mmol/mol?

About 53 mmol/mol. Use mmol/mol = (% − 2.15) × 10.929, or read both units from the report if your analyser prints them.

Does thalassaemia trait affect HbA1c?

It can. Many methods give reliable results in simple carriers, but some are biased by HbE or raised HbF, and HbA1c is unreliable in HbH disease and transfusion-dependent thalassaemia. Check your method’s variant data and use glucose-based tests when in doubt.

Can a point-of-care HbA1c result be used to diagnose diabetes?

Only if the device is certified and intended for diagnosis, its QC is in order and your clinical guidelines accept it. Many clinics use point-of-care HbA1c for monitoring and confirm a new diagnosis with a laboratory method.

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