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Insulin 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.

Quick summary

["Insulin levels help diagnose or monitor conditions like diabetes or hypoglycemia."]

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

Key facts at a glance

LOINC
47656-4
Short code
Insulin 1M p Glc SerPl-aCnc
Synonyms
Insulin 1M 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 diabetes, insulin resistance, or low blood sugar (hypoglycemia). It can also help evaluate how well medications like insulin or diabetes drugs are working.

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 tolerance test. Bring any medications you’re taking.

How the Test Works

A blood sample is taken from a vein (usually in your arm) and sent to a lab for analysis using an immunoassay method to detect insulin levels.

What the Results Mean

Results are compared to standard ranges, but exact values can vary by lab. High or low levels may signal diabetes, insulin issues, or other health concerns.

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.

◆Associated findings1

Short name

Insulin Level

Frequently asked questions

What causes abnormal insulin levels?
Conditions like diabetes, pancreatitis, or certain medications (e.g., steroids) can affect insulin levels. Lifestyle factors like diet or stress may also play a role.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab and insurance. Follow-up with your provider to review findings.
Can I eat or drink before this test?
If fasting is required, avoid food or liquids (except water) for 8–12 hours before testing. If no fasting is needed, eat normally and inform your provider.
  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