Metabolic Health

Fasting Insulin

Fasting insulin measures how much insulin your body needs to keep blood sugar stable when you haven’t eaten. It’s one of the best early indicators of insulin resistance—long before glucose or A1c go bad. High insulin means your cells aren’t responding well, which can wreck fat loss, energy, and long-term health. Low, steady insulin suggests efficient fuel use, fat adaptation, and metabolic flexibility.

Unit
u[IU]/mL
Health impacts
Metabolic Health · Energy

In your dashboard

Your trend, against your optimal range.

Example data · how your trend would appear once you test

At every level

What we'd do at any value.

Exploring

4.00u[IU]/mL

LowOptimal 2.00–6.00High

In your optimal zone

Habits that hold this position.

No specific guidance for this zone yet. We're working on it and will update this soon.

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QuestTest code: 561$7
LabCorpTest code: 004333$15
BioreferenceTest code: 0113-1$15
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For educational purposes; not a substitute for medical advice, diagnosis, or treatment.