Peptide fragment analysis for prohormone conversion (e.g., proinsulin to insulin)
This test measures small peptide fragments produced during the processing of certain prohormones in your blood. It helps assess how well your body converts these larger precursor molecules into their active forms.
["This test may help identify issues with hormone production or processing."]
Key facts at a glance
- LOINC
- 25574-5
- Short code
- C peptide sp1 p chal SerPl-sCnc
- Synonyms
- C peptide sp1 p chal SerPl-sCnc
- 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
What This Test Measures
Your sample is analyzed for specific peptide fragments, such as those derived from proinsulin (a precursor to insulin). The test detects the presence and relative amounts of these fragments to evaluate the efficiency of hormone maturation.
Why It’s Ordered
Doctors may order this test if they suspect conditions affecting hormone processing, such as certain endocrine disorders or metabolic conditions. It can also be part of broader evaluations for diabetes-related complications or other hormonal imbalances.
Sample Collection and Preparation
A blood sample is collected, typically from a vein in your arm. The sample is processed to separate serum or plasma, where the peptide fragments are measured using advanced laboratory techniques.
Common Uses and Conditions
This test is often used in research or specialized clinical settings to study hormone metabolism, though it is less commonly performed in routine care. It may be part of investigations into rare genetic disorders or metabolic syndromes.
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.
Abnormal results may indicate inefficient hormone processing, which could be linked to genetic mutations, metabolic disorders, or other systemic conditions. While less frequently used in standard practice, it provides critical insights for specific diagnostic scenarios.
Short name
Prohormone conversion marker
Frequently asked questions
Why might my doctor request this test?
What does a normal result mean?
How long will I need to prepare for this test?
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