Peptide fragment assay for prohormone P7 (e.g., proinsulin or related precursor peptides)
This test measures small peptide fragments derived from prohormones, such as those found in proinsulin or similar proteins. It may be used to assess metabolic or endocrine function, though specific clinical indications vary.
["This test helps evaluate how your body processes certain hormones or proteins over time."]
Key facts at a glance
- LOINC
- 25580-2
- Short code
- C peptide sp7 p chal SerPl-sCnc
- Synonyms
- C peptide sp7 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
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms or conditions linked to abnormal hormone processing, such as diabetes, metabolic disorders, or suspected prohormone dysfunction. It could also be part of a broader evaluation for endocrine or metabolic screening.
What to Expect Before the Test
No special preparation is typically required, but you may be asked to fast for a certain period if the test involves a blood draw. Follow your provider’s instructions carefully to ensure accurate results.
What the Test Involves
A blood sample is collected, usually from a vein in your arm. The sample is processed to measure peptide fragments in the serum or plasma. The test uses advanced laboratory techniques to detect these fragments at very low concentrations.
What the Results Mean
Results may indicate whether your body is producing or processing these peptide fragments normally. Elevated or altered levels could suggest metabolic or endocrine issues, but interpretation depends on clinical context and other test results.
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
Short name
P7 Peptide Screening
Frequently asked questions
What could cause abnormal results?
How often should this test be repeated?
Can this test be done at home?
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