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Insulin (Fasting)

Hormones

Insulin (Fasting)

Also known as: Fasting Insulin

COMMON RANGE

2.6 – 24.9

µIU/mL

0.36

27.2

Mayo Clinic Laboratories

Adult

↗

See all sources ↓

CONVERT & COMPARE

µIU/mL

95.8

pmol/L

13.8

uIU/mL

13.8

mcIU/mL

Reference ranges across 10+ sources

Adult reference ranges from 4 entries across 4 named sources, shown in µIU/mL. Compare side-by-side.

SOURCE

SEX

AGE

RANGE

VISUAL

CITE

ARUP Laboratories

All

≥18y

3 – 25 µIU/mL

↗

Mayo Clinic Laboratories

All

≥18y

2.6 – 24.9 µIU/mL

↗

Labcorp

All

≥18y

2.6 – 24.9 µIU/mL

↗

Quest Diagnostics

All

≥18y

≤18.4 µIU/mL

↗

ARUP Laboratories

All · ≥18y

↗

3 – 25 µIU/mL

Mayo Clinic Laboratories

All · ≥18y

↗

2.6 – 24.9 µIU/mL

Labcorp

All · ≥18y

↗

2.6 – 24.9 µIU/mL

Quest Diagnostics

All · ≥18y

↗

≤18.4 µIU/mL

About Insulin (Fasting)

An insulin in blood test measures the amount of insulin in a sample of your blood. Insulin is a hormone that your pancreas makes.

It helps move blood glucose (blood sugar) from your bloodstream into your cells where it's used for energy.

Normally, insulin and blood glucose levels rise and fall together. Blood glucose levels increase after you eat, and when blood glucose rises, your pancreas releases more insulin into your blood.

Serious problems can develop if your pancreas doesn't make the right amount of insulin at the right time. The test can be used to help diagnose and monitor diabetes, and it may also help detect rare insulin-producing tumors of the pancreas.

Main source: MedlinePlus ↗

Useful for

Find out the cause of hypoglycemia (low blood glucose)

Help evaluate signs of insulin resistance, usually as part of a panel of tests rather than on its own

Guide treatment decisions for type 2 diabetes

Monitor how well pancreatic islet cell transplantation surgery is working

Help diagnose and monitor diabetes

Help check for rare insulin-producing tumors of the pancreas

Main source: MedlinePlus ↗

Interpretation

If your insulin level is high and your blood glucose is normal or a little above normal for you, you may have insulin resistance.

If your insulin level is high or normal and your blood glucose is low for you, you may have hypoglycemia from too much insulin.

If your insulin level is low and your blood glucose is high for you, it may mean that your pancreas can't make enough insulin.

For general wellness information only. Talk to a clinician about your specific results.

Main source: MedlinePlus ↗

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Related biomarkers

Often tested alongside insulin (fasting) or part of the same panel.

Thyroid Stimulating Hormone (TSH)

Hormones

Free T4 (Thyroxine)

Hormones

Free T3 (Triiodothyronine)

Hormones

Total T4 (Thyroxine)

Hormones

Total T3 (Triiodothyronine)

Hormones

Reverse T3 (rT3)

Hormones

Sources

ARUP Laboratories

Mayo Clinic Laboratories

Labcorp

Quest Diagnostics

Last updated 2026-05-02

This page aggregates publicly available reference data and clinical information from Mayo Clinic Laboratories and other sources. For general wellness information only — not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.

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