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Insulin, Mass Concentration (Serum/Plasma)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of insulin in your blood, which helps regulate blood sugar levels. Insulin is a hormone produced by your pancreas.

Quick summary

["Insulin levels help diagnose conditions like diabetes or insulin resistance."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
47663-0
Short code
Insulin 30M p Glc SerPl-aCnc
Synonyms
Insulin 30M p Glc SerPl-aCnc
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
2.6
Ref high
24.9
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
CPT
83525
SNOMED
413618004
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test to check for conditions affecting blood sugar control, such as diabetes, hypoglycemia (low blood sugar), or insulin resistance. It might also be used to monitor treatment progress or rule out other metabolic disorders.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it’s part of a glucose monitoring panel. Bring any medications you’re currently taking.

How the Test Is Performed

A blood sample is drawn from a vein, typically in your arm, using a needle. The sample is sent to a lab for analysis using an immunoassay method to measure insulin concentration.

What the Results Mean

Results are interpreted by your healthcare provider based on your overall health, symptoms, and lab results. Abnormal levels may indicate whether you have too much or too little insulin in your body.

Reference range

Fasting: 2.6-24.9 μIU/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

High insulin levels may suggest insulin resistance, type 2 diabetes, or other endocrine disorders. Low insulin levels could indicate hypoglycemia, pancreatic issues, or rare genetic conditions. Regular monitoring helps manage blood sugar and prevent complications like nerve damage or heart disease.

Short name

Insulin Level

Frequently asked questions

What causes abnormal insulin levels?
Abnormal insulin levels can result from conditions like diabetes, insulinoma (a tumor producing excess insulin), or metabolic disorders. Medications, pregnancy, or stress may also affect insulin production.
How often should I get this test?
Your doctor will determine how often you need this test based on your medical history, symptoms, and treatment plan. Follow-up may be needed every few months or annually, depending on your condition.
Can lifestyle changes affect insulin test results?
Yes, diet, exercise, and weight management can influence insulin levels. Avoiding high-sugar foods, staying active, and maintaining a healthy weight may help stabilize blood sugar and improve test results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy