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Serum/plasma substance concentration (qualitative) for protein-related analyte (e.g., complement factor)

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

This test measures a specific protein-related substance in your blood, often linked to immune function or inflammation. Results help assess conditions affecting these proteins.

Quick summary

["Your blood test checks for certain proteins that may signal immune or inflammatory health."]

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

Key facts at a glance

LOINC
9878-0
Short code
J Pnt Depr L-AVL
Synonyms
J Pnt Depr L-AVL
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ekg
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

This test detects the presence or absence of a particular protein in your blood, typically used to evaluate components of the immune system or complement pathway. The exact protein may vary by lab, but it often relates to proteins involved in immune response or blood clotting regulation.

Why It’s Ordered

Your healthcare provider may order this test to diagnose or monitor conditions such as immune system disorders, infections, or certain blood disorders. It can also help assess how your body is responding to treatments.

Common Uses

Common reasons include evaluating immune function, detecting abnormalities in protein levels, or monitoring chronic conditions like autoimmune diseases or kidney function.

Sample Collection

A blood sample is drawn from a vein, usually in your arm. The blood is then processed to separate the serum or plasma for testing. You may experience a slight pinch or discomfort during the draw, but it typically lasts only a few minutes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How might my results affect my treatment plan?
Your results will be reviewed by your healthcare provider to determine if your protein levels are within expected ranges. Abnormal results may prompt further testing or adjustments to your treatment, such as medications or lifestyle changes.
What do abnormal results mean?
Abnormal results could indicate an underlying health issue, such as an overactive immune system, infection, or a condition affecting protein synthesis or breakdown. Your provider will discuss these findings with you and may recommend additional tests or treatments.
How often will I need this test?
The frequency depends on your medical condition and treatment plan. Your healthcare provider will let you know how often to schedule this test, which could range from once a year to more frequently if needed.
  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