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Serum Insulin Concentration (Quantitative)

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

This test measures the amount of insulin in your blood serum, a hormone that 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
55484-0
Short code
Insulin 10M p Glc IV SerPl-sCnc
Synonyms
Insulin 10M p Glc IV SerPl-sCnc
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 doctor may order this test to check for insulin-related issues, such as low blood sugar (hypoglycemia), high blood sugar (hyperglycemia), or insulin resistance. It may also be used to evaluate conditions like diabetes, pancreatic disorders, or growth hormone 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 tolerance or fasting study. Bring any medications you’re taking to your appointment.

How the Test Is Performed

A blood sample is drawn from a vein in your arm, typically in a clinic or doctor’s office. The blood is sent to a lab for analysis.

What the Results Mean

Results are interpreted by your healthcare provider based on your symptoms, medical history, and other test results. Abnormally high or low levels may signal underlying 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.

High insulin levels may indicate insulin resistance, type 2 diabetes, or other metabolic disorders. Low insulin levels could suggest hypoglycemia, pancreatic issues, or conditions like Addison’s disease. Your doctor will use these results alongside other factors to guide treatment.

Short name

Insulin Level

Frequently asked questions

When might I need this test?
This test may be recommended if you have symptoms like unexplained weight changes, frequent urination, extreme thirst, fatigue, or if your doctor suspects diabetes, hypoglycemia, or another endocrine disorder.
How long will I need to wait for results?
Results are typically available within 1–3 business days, depending on your lab and insurance. Your doctor will discuss them with you during your follow-up visit.
Can I eat or drink before this test?
If fasting is required (e.g., for a glucose study), avoid food and liquids except water for 8–12 hours beforehand. If fasting isn’t needed, you can eat and drink normally.
  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