If you've had blood work done through your doctor, you've probably seen your fasting glucose. Maybe your HbA1c too. Both are standard metabolic screening markers. Both are useful. And both can look perfectly normal while your metabolic health is already heading in the wrong direction.
That's where fasting insulin comes in. It can reveal insulin resistance years before glucose or HbA1c start to look abnormal.
What Fasting Insulin Tells You
Insulin is the hormone your pancreas releases to shuttle glucose from your blood into your cells. A fasting insulin test measures how much insulin your body needs to produce just to maintain normal blood sugar while you haven't eaten.
When your cells start becoming resistant to insulin, your pancreas compensates by producing more. Your blood sugar stays normal because your body is working harder behind the scenes. This is insulin resistance in its early stage: your glucose looks fine, but your fasting insulin is elevated.
Why Glucose Alone Isn't Enough
Think of it this way:
- Fasting glucose tells you when the dam has broken
- HbA1c tells you when the flood has been happening for a while
- Fasting insulin tells you when the pressure is building behind the dam
If you want to catch metabolic dysfunction early, when you can still reverse it, fasting insulin is the marker that gives you that lead time.
Why Your Doctor Doesn't Order It
In Ontario, OHIP covers metabolic screening based on clinical guidelines centered on fasting glucose and HbA1c. Fasting insulin isn't part of the standard metabolic panel unless your doctor suspects a specific endocrine condition.
Who Should Test Fasting Insulin?
Anyone interested in their metabolic health, particularly people with a family history of type 2 diabetes, anyone carrying excess weight around the midsection, people whose fasting glucose is in the upper normal range, active individuals who want to verify their metabolic health, and anyone focused on longevity.
How to Get Fasting Insulin Tested
You can order a fasting insulin test through Bespoke Labs. Consider adding fasting glucose and HbA1c for a complete metabolic picture. This test requires fasting (10-12 hours, water is fine), so plan a morning visit to any Dynacare location in Ontario.