Glycated haemoglobin reflects average blood glucose across roughly the preceding two to three months, which makes it considerably harder to game than a single fasting glucose taken after a careful week. Chronic hyperglycaemia glycates proteins throughout the body, driving microvascular damage in the retina, kidney and nerves as well as macrovascular disease.
The global diagnostic and monitoring standard for diabetes. The DCCT and UKPDS trials established that glycaemic control reduces microvascular complications, and the WHO and ADA diagnostic thresholds are built directly on that evidence base.
Singapore guidance
Recommended for the general population
Singapore’s national screening committee recommends fasting glucose or HbA1c from age 40, every three years. HbA1c is not a reliable screen with thalassaemia or another haemoglobinopathy, iron-deficiency or haemolytic anaemia, B12 or folate deficiency, chronic kidney or liver disease, recent blood loss or transfusion, or in pregnancy.
Source: Screening Test Review Committee report 2026, Volume 1 (Academy of Medicine Singapore and Ministry of Health, February 2026), Table 2A(ii). The full national list · How this is used.
What you would actually pay
- Healthier SG
- Not subsidised
- MediSave
- Not among the screenings named for outpatient claims
Source: Healthier SG Screening (HealthHub) and MediSave outpatient care (Ministry of Health). Absence from either list is not a statement that the test is discouraged — only that no subsidy or claim applies. Gross prices compared.
What it costs when it is wrong
- Basis
- No published harm criterion found
- Severity
- Not documented
No published harm criterion found for this test.
An empty finding, not a clean bill of health: this means nothing documented was found for this test. It is not a claim that the test is safe.
Screening harm is not only a laboratory question: the committee’s own criteria advise against a test when “the screening test, or follow-up tests arising from a positive screen, are associated with significant medical risks”. Sources on overdiagnosis → · How this is graded.
FAQ
Is the HbA1c worth doing in Singapore?
HbA1c carries a strong evidence grade for screening adults without symptoms. It typically costs S$15–25 in Singapore. Subsidised for eligible Singaporeans 40+ under Healthier SG Screening, which uses a fasting glucose test (S$0–5 per visit incl. consult). Most appropriate for adults from 40 (Singapore's national recommendation); earlier with overweight, a family history or other metabolic risk factors. Not suitable with thalassaemia or other haemoglobin disorders, iron-deficiency or haemolytic anaemia, B12 or folate deficiency, chronic kidney or liver disease, recent blood loss or transfusion, or in pregnancy; fasting glucose is used instead. The usual schedule: every 3 years from 40; annually if prediabetic or at elevated risk.
Weighing this against something else? Compare it with two other tests → · Price it inside a panel →