What are the differences between FBS and HbA1c testing?
A blood sugar test measures the blood sugar level to assess how well your body can control the blood sugar levels. This test can screen and identify people at risk of diabetes. Tracking blood sugars over time helps to evaluate the effectiveness of diabetes treatment. There are two blood tests for this purpose:
- Fasting Blood Sugar (FBS) requires at least 8 hours of fasting. The results reflect the blood sugar level at the time of the blood drawing. It is a standardized measurement that allows comparison among people on how well they can control their blood sugar.
- Glycated hemoglobin (HbA1c) measures the concentration of glycated hemoglobin proteins. It reflects the average blood sugar concentration over the past 2-3 months. The type and quantity of foods consumed significantly affect HbA1c level. This test can diagnose and help the management of diabetes and predict the risk of complications. Fasting is not necessary.
People can game the FBS blood testing for a spuriously better result by altering their food intakes a few days before the test. However, short-term diet manipulation cannot influence the HbA1c values.
Related Doctors
Link to doctor
Dr Prasit Powthongkum
Treatments And Services
Medical Genetics, Internal Medicine Link to doctor
Dr Nattapark Pratakpiriya
Treatments And Services
Internal Medicine Link to doctor
Dr Piyanuch Piyasatit
Sub Specialty
- Endocrinology (Diabetes, Thyroid, Hormone, Nutrition, Metabolism)
Treatments And Services
Internal Medicine, General Endocrinology, Endrocrinology and Metabolism Link to doctor
Dr Jakapat Vanichanan
Treatments And Services
General Infectious Disease, Internal Medicine Link to doctor
Dr Thitinun Anusornvongchai
Sub Specialty
- Endocrinology (Diabetes, Thyroid, Hormone, Nutrition, Metabolism)
Treatments And Services
Endrocrinology and Metabolism, Internal Medicine Link to doctor
Assoc.Prof. Dr Porpon Rotjanapan
Specialty
- Internal medicine
- Geriatrics Medicine
Treatments And Services
Internal Medicine, Geriatric Medicine Link to doctor
Dr Unchana Sura-amonrattana
Treatments And Services
Geriatric Medicine, Internal Medicine Link to doctor
Dr Peerawong Werarak
Treatments And Services
General Infectious Disease, Internal Medicine Link to doctor
Dr Nantharath Wongwora-aporn
Treatments And Services
Internal Medicine, Preventive Medicine Link to doctor
Dr Siraya Jaijakul
Treatments And Services
General Infectious Disease, Internal Medicine Link to doctor
Dr Nicha Somlaw
Treatments And Services
Adult Gastroenterology (Nutrition), Clinical Nutrition, Internal Medicine, Obesity and Overweight Link to doctor
Prof.Dr Khajohn Tiranathanakul
Treatments And Services
Nephrology, Internal Medicine Link to doctor
Dr Vacharaphan Asanumet
Sub Specialty
- Endocrinology (Diabetes, Thyroid, Hormone, Nutrition, Metabolism)
Treatments And Services
Endrocrinology and Metabolism, Internal Medicine Link to doctor
Assist.Prof.Dr Chaiwut Sawawiboon
Sub Specialty
- Pulmonary Medicine
- Critical Care Medicine
Treatments And Services
Pulmonary Medicine and Pulmonary Critical Care, Critical Care Medicine, Internal Medicine Link to doctor
Dr Pawinee Noinart
Treatments And Services
Hematology, Internal Medicine Link to doctor
Assist.Prof.Dr Jirayos Chintanadilok
Sub Specialty
- Sleep Medicine
- Geriatric Medicine
- Pulmonary Medicine
Treatments And Services
Sleep Medicine, Pulmonary Disease, Geriatric Medicine, Internal Medicine Link to doctor
Dr Prapaporn Phimphilai
Treatments And Services
Diabetes Mellitus, Internal Medicine, Hypertension, Obesity and Overweight, Osteoporosis, Travel Medicine and Continuum of Care Link to doctor
Dr Worawan Sirichana
Sub Specialty
- Pulmonary Critical Care Medicine
Treatments And Services
Critical Care Medicine, Internal Medicine, Pulmonary Medicine and Pulmonary Critical Care Link to doctor
Dr Pattama Rimmakunsub
Treatments And Services
Internal Medicine 
