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Serum or Plasma Concentration of a Specific Protein or Peptide (e.g., Fibrinogen, C-Reactive Protein, or a Renin Substrate)

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

This test measures the amount of a particular protein or small peptide in your blood, often used to assess inflammation, clotting function, or kidney/heart health.

Quick summary

["Understanding your protein levels can help diagnose or monitor conditions like infections, blood disorders, or organ function."]

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

Key facts at a glance

LOINC
86022-1
Short code
S pn Da sero 19F IgG Ser-aCnc
Synonyms
S pn Da sero 19F IgG Ser-aCnc
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 check for conditions like high inflammation (e.g., rheumatoid arthritis), blood clotting risks, kidney disease, or heart-related issues. It could also be part of routine screening or monitoring for a known condition.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours if the test involves a specific protein (like fasting for glucose-related tests). Bring any medications you’re taking.

During the Test

A healthcare provider will draw blood from a vein in your arm. It may feel slightly uncomfortable but shouldn’t last long. You can rest afterward.

What the Results Mean

Results vary by protein—some may be higher in infections, others in clotting disorders. Your doctor will compare your levels to what’s typical for your age/health and explain what it suggests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Elevated or Low Levels Can Signal Underlying Issues

Frequently asked questions

What does my test result indicate?
Your doctor will interpret results in the context of your medical history, symptoms, and other tests. For example, very high levels might mean inflammation or infection, while very low levels could signal liver/kidney problems or bleeding disorders. Ask your provider for a personalized explanation.
Will I need to repeat this test?
Sometimes, follow-up tests are needed to confirm results or track changes over time. Your doctor will let you know if retesting is recommended based on your situation.
Are there any risks or side effects?
The most common side effect is a mild bruise or slight pain at the injection site. Rarely, there may be a small risk of infection or fainting (especially if you’re nervous). Most people tolerate blood draws well.
  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