Screening for Diabetes Mellitus
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Screening should be considered in adults of any age who have one or more risk factors for diabetes. In those without risk factors , testing should begin at 40 years. Those between 18-39 years old can consider doing the Diabetes Risk Assessment Tool (DRAT) on the HealthHub website or the HealthHub app to assess their risk of getting Diabetes. Those who have been found to be high risk using the DRAT assessment should undergo formal blood test screening.

Diabetes Risk Assessment Tool

Diabetes Screening (CDMP Handb​ook guidelines)5

The recommended investigations for screening of diabetes in asymptomatic individuals aged ≥40 and/or with risk factors for diabetes are as follows:

  1. Fasting plasma glucose (FPG)
  2. HbA1c (not suitable for those with haemoblobinopathy)

Asymptomatic individuals with a result suggestive of Diabetes Mellitus based on the above tests should have a repeat test on a subsequent day. For these patients, when two different tests are available and the results are above the diagnostic thresholds, the diagnosis of diabetes is confirmed.

If HbA1c is used as the screening test, the following interpretation and follow-up testing is recommended.

Table. Summary of HbA1c Screening Guidelines5 

  HbA1C Screening Interpretation Action Recommended Diagnosis

High risk of DM 

OR

Age ≥ 40 years

 

 6.0% and below

Low probability of diabetes.

No further tests needed if there are no symptoms of diabetes.*

Further testing with an FPG or 2hOGTT is recommended in the presence of clinical  suspicion of diabetes.

No Diabetes

Maintain healthy lifestyle and weight. Repeat test in 3 years.

6.1% to 6.9% Proceed to FPG or OGTT

FPG≤ 6.0mmol/L

OR 2hOGTT < 7.8mmol/L

FPG 6.1-6.9 mmol/L

OR 2hOGTT 7.8-11.0 mmol/L

Pre-diabetes

Manage as per Appropriate Care Guidelines (ACG).

FPG ≥7.0mmol/L

OR 2hOGTT ≥ 11.1mmol/L

Diabetes

Manage Accordingly


7.0% and above High probability of diabetes No further tests needed.

* Symptoms of diabetes mellitus include: frequent urination, increased thirst, weight loss with no obvious cause, frequent skin infections, slow wound healing and blurring of vision. Of note, these symptoms are not specific for diabetes.