Peptide fragment analysis of propeptide 3 (P3) in serum/plasma by mass concentration
This test measures a specific peptide fragment derived from a protein precursor in your blood. It may be used to assess protein processing or metabolic function.
["This test helps evaluate protein metabolism or potential abnormalities in protein breakdown."]
Key facts at a glance
- LOINC
- 50463-9
- Short code
- C peptide sp3 SerPl-sCnc
- Synonyms
- C peptide sp3 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 Is This Test Measuring?
The test detects a small peptide fragment (P3) produced during normal protein processing. This fragment is part of a larger precursor protein that may be relevant to conditions affecting protein metabolism or clearance.
Why Might You Need This Test?
Your healthcare provider may order this test if you have symptoms or conditions linked to altered protein metabolism, such as certain genetic disorders or metabolic diseases. It could also be part of a broader evaluation for unexplained biochemical changes in your blood.
Sample Collection and Preparation
A blood sample is drawn from a vein, typically in the arm. The sample is processed to separate serum or plasma, which is then analyzed for the peptide fragment. This test requires fresh or properly stored blood samples.
Common Uses and Clinical Contexts
This test is less commonly ordered than standard blood tests but may be used in specialized cases, such as diagnosing or monitoring conditions involving abnormal protein processing, like certain lysosomal storage 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.
◆Associated findings1
Short name
P3 Peptide Serum/Plasma
Frequently asked questions
Why was this test ordered?
What do the results mean?
How often will I need 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