Getting Tested: Where and How
Reviewed by CDE Mehandi Sharma · Updated
Knowing you should be tested and actually getting it done are two different things. Here is the practical version.
Where: any diagnostic laboratory, most clinics, and government health facilities. You do not need a specialist referral for a fasting glucose or an HbA1c.
How to prepare for a fasting test: nothing to eat or drink except water for at least eight hours, so an early morning appointment after an overnight fast is easiest. Water is fine and important. Tea with sugar, or even without, breaks the fast — this is the single commonest reason a test has to be repeated.
HbA1c needs no fasting at all, which makes it the easier option if a morning slot is hard to arrange.
Reading the report: look for the actual numbers next to the reference range, not just whether anything is flagged. Many labs only flag values above the diabetes threshold, so a result sitting squarely in the prediabetes range can appear unremarkable on the page.
If a result is abnormal, it should generally be confirmed with a repeat test before anything is concluded.
Then act on it rather than filing it. An abnormal result with no follow-up is the commonest way prediabetes progresses quietly — and yearly retesting is recommended from that point on.