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Insulin, Plasma (Mass Concentration)

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

This test measures the amount of insulin in your blood plasma, which helps assess how your body uses glucose for energy.

Quick summary

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

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

Key facts at a glance

LOINC
12767-0
Short code
Insulin 50M p chal SerPl-mCnc
Synonyms
Insulin 50M p chal SerPl-mCnc
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 Is This Test Done?

Your doctor may order this test to check for insulin-related disorders, such as hypoglycemia (low blood sugar), hyperinsulinemia (high insulin levels), or to evaluate how your body responds to insulin, especially if you have symptoms like unexplained weight changes, fatigue, or frequent hunger.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or hand to draw blood. If you’re fasting, follow your doctor’s instructions to ensure accurate results.

What the Results Mean

Results help determine if your insulin production or sensitivity is abnormal. For example, high levels might suggest insulin resistance or tumors, while low levels could indicate diabetes or other metabolic issues.

Common Conditions This Test Helps Diagnose

This test is often used alongside other blood tests to diagnose or manage conditions like type 1 or type 2 diabetes, insulinoma (a rare tumor), or Cushing’s syndrome (which can affect hormone balance).

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

Plasma Insulin Level

Frequently asked questions

How often should I get this test?
Your doctor will decide how often you need this test based on your symptoms, medical history, and treatment plan. Regular monitoring may be recommended if you have diabetes, a history of hypoglycemia, or other metabolic disorders.
What are typical reference ranges for this test?
Reference ranges vary by lab and individual factors. Your doctor will interpret results in the context of your overall health and medical history.
Can diet or exercise affect insulin levels?
Yes, diet and exercise can influence insulin levels. Eating a balanced diet, avoiding excessive sugar, and staying physically active may help stabilize blood sugar and insulin production.
  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