Peptide fragment analysis for prohormone conversion (specifically proinsulin or related peptide fragments)
This test measures small peptide fragments produced during the breakdown of proinsulin, a precursor to insulin. It helps assess pancreatic function and diabetes management.
["This test helps track how well your body processes insulin and may aid in diabetes care."]
Key facts at a glance
- LOINC
- 58497-9
- Short code
- C peptide sp11 p chal SerPl-mCnc
- Synonyms
- C peptide sp11 p chal SerPl-mCnc
- Category
- coagulation
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85610
- SNOMED
- 396252006
- 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
Doctors may order this test to evaluate pancreatic health, especially in people with diabetes or suspected insulin-related disorders. It can also help monitor treatment progress for conditions affecting insulin production.
What to Expect Before the Test
No special preparation is typically needed. Blood is drawn from a vein, usually in your arm. You may feel slight discomfort, but it usually lasts only a few minutes.
How the Results Are Interpreted
Results are compared to general reference ranges for peptide fragments. Elevated levels may indicate issues with insulin processing or diabetes complications, while abnormal patterns could signal other metabolic concerns.
Common Conditions Monitored
This test is often used in diabetes care to monitor proinsulin conversion, though it’s not a standard routine test. It may be part of specialized evaluations for insulin resistance, pancreatic disorders, or metabolic syndrome.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: This test helps identify imbalances in insulin metabolism, which can affect blood sugar control. Elevated or altered peptide fragments may signal diabetes progression, insulin dysfunction, or other metabolic disorders that require medical attention.
Short name
Proinsulin/peptide C screening
Frequently asked questions
What does a high or low result mean?
Is fasting required for this test?
How often should this test be done?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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