Type 2 diabetes can be detected through a blood test once the disease has progressed. Remember, diabetes is an illness which happens overtime and cannot be determined from a blood test right away. There are several types of blood tests that are performed to determine if diabetes is present. The most common are:
- Random blood sugar test – As suggested by its name, this test is taken at a random time regardless of the last time you ate. It is measured in milligrams per deciliter (mg/dL) or millimoles per liter. Results of 200mg/dL (11.1mmol/L) or higher would indicate that a person has diabetes.
- Glycated hemoglobin test – This test measures the percentage of blood sugar attached to an oxygen-carrying protein called hemoglobin. The more sugar that’s attached to hemoglobin indicates high blood sugar levels. This test is done over the course of two or three months. Test results showing 6.5% or higher on at least two tests means a person has diabetes. Tests results between 5.7% – 6.4% are considered pre diabetic.
- Oral Glucose tolerance test – This test requires the patient to fast overnight. Blood is drawn and measured the following morning. The patient is then given a sugary drink and blood is tested throughout the next couple hours. Blood sugar levels of 200 mg/dL or more after 2 hours means a person has diabetes.
- Fasting blood sugar test – Blood is drawn after an overnight fast. Results showing 126 mg/dL on 2 separate tests means a person has diabetes.