With over 1.5 million years of combined knowledge, the Diabetes Forum is the perfect place to connect with other people who have prediabetes or have placed the condition into remission.
Visit the diabetes ForumThere are three suggested blood tests that can be used to detect and diagnose prediabetes:
These tests also identify type 2 diabetes before diagnosis, as there is an intermediate range between normal and type 2 diabetes. It is this range that is considered diagnostic for prediabetes.
The HbA1c blood test has advantages as it doesn’t involve fasting or lengthy lab visits. It simply uses average sugar levels over the last two to three months.
The FPG test involves fasting for eight hours, or overnight, before the blood test. You also need to fast for OGTT. The test consists of two blood tests, one at the beginning of the appointment, and the other two hours later after having a sugary drink.
The results indicating prediabetes are:
A fasting plasma glucose (FPG) test includes fasting for eight hours, or overnight, and having a blood test. A blood sugar level of 5.6mmol/L-6.9mmol/L or 100–125 mg/dL indicates prediabetes.
For an oral glucose tolerance test (OGTT), blood is taken once and then again two hours later after drinking a sugary drink. Blood sugar level between 7.8mmol/L and 11.1mmol/L (140–199mg/dL) indicates prediabetes or impaired glucose tolerance (IGT).
If results are below these figures, there is still a possibility of developing type 2 diabetes in the future; however the risk of developing type 2 diabetes increases when results lie within these prediabetes ranges.
The National Institutes of Health (NIH)[1] suggests taking the same test twice to confirm a diagnosis.
It is important to remember that these tests do not always identify prediabetes in the same way for some people. Some may have prediabetes results from a Hb1Ac test, but their FPG may be within the ‘normal’ range.
If prediabetes is suspected but results are ‘normal’, it is important to repeat a test in a short period of time, such as within a year, or to confirm the ‘normal’ result with one of the other tests.
For those with prediabetes under the age of 60 and with other risk factors, metformin (a medication used to treat and prevent type 2 diabetes) should be considered.
[1] https://www.niddk.nih.gov/health-information/diagnostic-tests/a1c-test
Join the free community and speak to other people who manage and may have reversed prediabetes.
