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Insulin, Pre-Challenge, Serum/Plasma — Mass Concentration

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

Measures insulin levels in blood before a glucose or other challenge test to help assess how the body handles a controlled stimulus.

Quick summary

["A pre-challenge insulin blood test helps evaluate insulin production and insulin resistance."]

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

Key facts at a glance

LOINC
12738-1
Short code
Insulin pre chal SerPl-mCnc
Synonyms
Insulin pre 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

What is this test?

This test measures the concentration of insulin in your blood before a challenge, most often a glucose drink. It may be collected along with glucose levels before and after the challenge.

Why might I need this test?

Clinicians may order this test to evaluate how your body responds to glucose and to help investigate symptoms of high or low blood sugar. It is often used when assessing possible insulin resistance or differences in insulin production.

How is the test performed?

A blood sample is taken before you are given the challenge, which is commonly an oral glucose drink. Your blood may then be sampled at scheduled times to measure the response.

How do I prepare for the test?

Follow the laboratory's instructions about fasting and the timing of the challenge. Take medicines only as directed, and tell the healthcare team about diabetes medicines, symptoms, and any recent changes in your health.

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

Pre-challenge insulin

Frequently asked questions

Is this the same as a routine fasting insulin test?
Not necessarily. A pre-challenge insulin sample is collected specifically before a controlled challenge, while a routine fasting insulin test is measured without that challenge.
Why are several blood samples taken?
Samples taken over time show how insulin and glucose change as the body responds to the challenge. This provides more information than a single measurement.
Does an abnormal insulin result diagnose diabetes?
No. Diabetes and other conditions are diagnosed or evaluated using several findings, including glucose results, symptoms, and sometimes other laboratory tests.
  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