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Insulin, Serum Concentration (Quantitative)

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 can indicate how well your body manages blood sugar, especially important for those with diabetes or metabolic health concerns."]

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

Key facts at a glance

LOINC
27372-2
Short code
Insulin 20M p chal SerPl-aCnc
Synonyms
Insulin 20M 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 Is Done

Your doctor may order this test to check for conditions like diabetes, insulin resistance, or to monitor treatment effectiveness for blood sugar control. It can also help diagnose issues like hypoglycemia (low blood sugar) or hyperinsulinemia (high insulin levels).

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-insulin profile. Bring any medications you’re taking to your appointment.

During the Test

A healthcare provider will draw blood from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause discomfort. The blood sample is then sent to a lab for analysis.

What the Results Mean

Results help determine if your insulin levels are within a healthy range or if there’s an imbalance that needs medical attention. Your doctor will interpret the results in the context of your overall health and symptoms.

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 producing excess insulin, or other metabolic disorders. Low insulin levels could indicate diabetes, pancreatic issues, or inadequate hormone production. Regular monitoring is key for managing blood sugar and preventing long-term complications.

Short name

Insulin Level

Frequently asked questions

What causes abnormal insulin levels?
Several factors can influence insulin levels, including diet (especially high-carb or sugary foods), physical activity, certain medications, and underlying health conditions like diabetes or pancreatic disorders. Stress, sleep patterns, and weight 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’s processing time. Your doctor will contact you once they’re ready to discuss the findings.
Can I eat or drink before this test?
If fasting is required (common for insulin tests), avoid food and liquids—except water—from midnight the night before or as instructed. If no fasting is needed, you can eat normally, but check with your provider to confirm.
  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