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Insulin concentration in serum/plasma (25th–75th percentile range)

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

This test measures insulin levels in your blood at different percentiles (25th and 75th) to help assess how your body regulates glucose over time.

Quick summary

["This test provides a snapshot of insulin production and response to glucose levels across a broader range of your body’s natural fluctuations."]

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

Key facts at a glance

LOINC
13609-3
Short code
Insulin 2.5h p 75 g Glc PO SerPl-mCnc
Synonyms
Insulin 2.5h p 75 g Glc PO SerPl-mCnc
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 This Test Is Done

Your healthcare provider may order this test if you have concerns about insulin sensitivity, diabetes management, or unexplained blood sugar patterns. It can also help evaluate conditions like prediabetes, insulin resistance, or metabolic syndrome.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the test. Bring any medications you’re currently taking to your appointment.

How the Test Works

A blood sample is drawn from a vein, usually in your arm. The sample is tested for insulin concentration using an immunoassay method to detect insulin protein levels.

What the Results Mean

Results compare your insulin levels to a reference range of healthy individuals at the 25th and 75th percentiles. Abnormal results may indicate how your body processes insulin or glucose.

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.

Clinical Significance

Short name

Insulin Range Test

Frequently asked questions

How does this test help diagnose or monitor conditions?
This test can help identify insulin resistance, which may lead to type 2 diabetes or metabolic disorders. It may also assess insulin deficiency or fluctuations in insulin sensitivity, especially in people with prediabetes or gestational diabetes.
What are the most common reasons for ordering this test?
Common reasons include evaluating glucose metabolism, assessing insulin sensitivity in patients with obesity, polycystic ovary syndrome (PCOS), or unexplained weight changes. It may also be used in research or clinical studies to study insulin dynamics.
Are there any risks or side effects from this test?
The most common side effect is mild bruising or soreness at the needle insertion site. Rarely, there may be a slight reaction to the blood draw, such as dizziness or fainting. Most side effects are minor and resolve quickly.
  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