Diabetes Testing in Singapore

Diabetes testing involves measuring blood glucose levels to diagnose, monitor, and manage diabetes mellitus. These tests assess how the body processes sugar, enabling healthcare providers to detect diabetes, evaluate treatment effectiveness, and help prevent complications. Regular testing supports tailored medication adjustments and lifestyle changes to maintain stable blood sugar levels.

Dr Ben Ng

Senior Consultant Endocrinologist

Dr Donovan Tay

Senior Consultant Endocrinologist

Who Should Be Tested for Diabetes?

Diabetes testing is necessary for individuals at risk of developing the condition or managing existing diabetes.

Family History of Diabetes

Those with close relatives diagnosed with type 2 diabetes are at higher risk due to genetic factors.
Obesity

Individuals with a BMI over 23 should consider regular testing because of the strong link between excess weight and insulin resistance.
Gestational Diabetes Monitoring

Pregnant women are tested between 24–28 weeks to prevent complications affecting both mother and baby. After giving birth, people who were diagnosed with Gestational Diabetes Mellitus should have testing at least every 1–3 years.
Cardiovascular Disease

Those with heart conditions are advised to test regularly, as diabetes often coexists with cardiovascular problems. Even patients with high blood pressure or high cholesterol levels should be tested.
Age-Related Screening

Adults aged 35 and above should be tested at a minimum of 3-year intervals, sooner with symptoms or change in risk (e.g., weight gain).
Symptoms Suggestive of Diabetes

Testing is recommended for individuals experiencing frequent urination, excessive thirst, unexplained weight loss, fatigue, or blurry vision.
Polycystic Ovary Syndrome (PCOS)

Women with PCOS face a higher risk of insulin resistance and may benefit from regular testing.
Other High-Risk Groups

Individuals with HIV, steroid usage, evidence of gum disease, history of pancreatitis or fatty liver.

Note: If you are known to already have prediabetes, you should be tested every year.

Benefits of Diabetes Testing

Diabetes testing offers significant advantages in both prevention and ongoing care.

Early Detection of Diabetes

Testing identifies pre-diabetes or diabetes in its earliest stages, often before symptoms appear. This allows for early interventions that can delay or prevent progression.

Complication Prevention

Early diagnosis and treatment with regular monitoring helps reduce the likelihood of long-term health issues, including damage to the heart, kidneys, eyes, and nerves.

Tailored Treatment Plans

Blood sugar readings guide healthcare providers in adjusting medications, recommending dietary changes, or suggesting other lifestyle modifications.

Diabetes Testing Methods

Fasting Plasma Glucose (FPG)

This test measures blood sugar levels after fasting for at least 8 hours. A sample is taken in the morning before eating. Results of 126 mg/dL (7 mmol/L) or higher on two occasions confirm diabetes.
Oral Glucose Tolerance Test (OGTT)

A more detailed test that involves fasting, consuming a glucose solution, and having blood sugar levels measured over a period of 2 hours. It evaluates how effectively the body processes sugar.
Glycated Haemoglobin (A1C) Test

Provides an average of blood sugar levels over 3 months. This test is a reliable indicator of long-term blood sugar control.
Random Plasma Glucose Test

This test measures blood sugar at any time, regardless of when you last ate. It is typically used for diagnosing diabetes when symptoms are present.
Insulin Levels

This measures the body’s response to the sugar in the blood at the present time. It is good for detecting conditions such as insulin resistance or deficiency. This can help pinpoint the cause of the raised blood sugar.

Preparing for Testing

Fasting Requirements

For FPG and OGTT, avoid eating or drinking anything other than water for 8–12 hours before the test. Follow your healthcare provider’s instructions regarding medications.

Medications and Supplements

Inform your doctor about any medications or supplements you take, as these can influence blood sugar levels and the accuracy of your results.

Test Scheduling

For fasting tests, schedule an early morning appointment to minimise fasting duration. Non-fasting tests like A1C and random glucose tests can be performed at any time of the day.

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Results Review and Follow-Up

Test results are typically available within a few hours to a few days, depending on the testing method. Your doctor will review the results, discuss what they mean, and recommend next steps. These may include lifestyle adjustments, medications, or additional tests. Regular follow-up appointments ensure ongoing monitoring and necessary modifications to your care plan.

Frequently Asked Questions

How often should I be tested if I’m at high risk?

For high-risk individuals, testing is typically recommended once a year. However, your doctor may advise more frequent testing based on your specific risk factors and health status.

Can stress affect test results?

Yes, stress can temporarily raise blood sugar levels, which may influence test results. Inform your doctor if you are experiencing significant stress during testing.

What’s the difference between pre-diabetes and diabetes?

Pre-diabetes refers to blood sugar levels that are higher than normal but not high enough for a diabetes diagnosis. While it does not meet the threshold for diabetes, it increases the risk of developing diabetes and related health complications.

Can I fast for longer than recommended or restrict my carbohydrates before the test in order to get a normal oral glucose tolerance test?

Individuals are advised to maintain a varied diet that includes at least 150 grams of carbohydrates during the three days leading up to an OGTT. Reducing carbohydrate intake before the test may artificially raise glucose levels after the challenge, possibly leading to a false-positive OGTT result.

Dr Ben Ng

Senior Consultant Endocrinologist

As a senior consultant endocrinologist with over 20 years of clinical experience, Dr Ben Ng provides comprehensive care for patients managing various endocrine conditions. His expertise includes the diagnosis and treatment of diabetes, thyroid disorders, obesity, and a range of other metabolic and endocrine conditions.

Dr Ben Ng Jen Min graduated from the Queens University of Belfast Northern Ireland, United Kingdom (UK).
He completed his postgraduate training with the certificate of completion of training (CCT) from the Royal College of Physicians (UK) with dual accreditation in diabetes and endocrinology and in general internal medicine.
In 2010, he was awarded an MD with honours by the University of Hull, UK, in recognition for his research in diabetes mellitus

Dr Donovan Tay

Senior Consultant Endocrinologist

As a senior consultant endocrinologist with over 20 years of clinical experience, Dr. Donovan Tay provides comprehensive care for patients managing various endocrine conditions. His expertise includes the diagnosis and treatment of diabetes, thyroid disorders, osteoporosis, and a range of other metabolic and endocrine conditions.

Dr. Donovan Tay graduated from the National University of Singapore (NUS) and obtained his membership in the Royal College of Physicians (UK), Master of Medicine (NUS), and Master of Clinical Investigation (NUS).
After completing training in endocrinology, he was conferred as a Fellow of the Academy of Medicine, Singapore (FAMS).
He further specialised in endocrinology with a fellowship at the prestigious Columbia University Medical Centre in New York City.

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