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Insulin, Serum (Quantitative)

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

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

Quick summary

["Insulin helps control how your body uses glucose for energy."]

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

Key facts at a glance

LOINC
29379-5
Short code
Insulin 6h p chal SerPl-aCnc
Synonyms
Insulin 6h p chal SerPl-aCnc
Category
hormone
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
2.6
Ref high
24.9
Fasting
false
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 Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms of low or high blood sugar, such as excessive thirst, fatigue, or unexplained weight changes. It could also be used to diagnose conditions like diabetes, hypoglycemia, or 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 tolerance or metabolic evaluation. Bring any medications you’re currently taking to your appointment.

How the Test Is Performed

A blood sample is drawn from a vein, typically in your arm, using a small needle. You may feel a slight pinch, but it usually doesn’t cause discomfort afterward.

What the Results Mean

Results help determine whether your insulin levels are within normal ranges or if they’re too high or too low, which can indicate underlying health issues.

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.

Abnormally high insulin levels may suggest insulin resistance, tumors, or other endocrine disorders. Low insulin levels could indicate diabetes, pancreatic issues, or other metabolic imbalances. Regular monitoring is important for managing conditions like diabetes or prediabetes.

Short name

Serum Insulin Level

Frequently asked questions

How long does it take to get my insulin test results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your healthcare provider will contact you once they have the results.
Can I eat or drink before this test?
If fasting is required (common for insulin tests), avoid food and liquids—except water—8–12 hours before the test. Always follow your provider’s instructions.
What does an abnormal insulin level mean?
An abnormal result may signal conditions like hypoglycemia (low blood sugar), diabetes, or other hormonal imbalances. Your provider will discuss findings and next steps with you.
  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