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Serum or plasma mass concentration of a specific protein marker measured by immunoassay (e.g., a marker for certain inflammatory or immune responses)

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

This test measures a protein in your blood that may help assess inflammation or immune activity. Results can support diagnosis or monitoring of conditions like infections, autoimmune diseases, or other health concerns.

Quick summary

["This test helps track potential immune or inflammatory processes in your body."]

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

Key facts at a glance

LOINC
42303-8
Short code
MR Orbit+Face
Synonyms
MR Orbit+Face
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr
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

The test detects the presence and amount of a particular protein in your blood. This protein could be linked to immune responses, inflammation, or other biological processes. The method used ensures accurate detection of very small amounts of this substance.

Why It’s Done

Doctors may order this test if you have symptoms like fever, fatigue, swelling, or if you’re being evaluated for conditions such as infections, autoimmune diseases, or other health issues that involve immune or inflammatory responses.

How It’s Done

A blood sample is drawn from a vein, usually in your arm. The blood is then processed to separate the serum or plasma, where the protein is measured using a sensitive immunoassay technique.

What to Expect Before the Test

There are no special preparations needed for this test. However, if you’re taking certain medications or have a condition that might affect blood protein levels, let your healthcare provider know.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

This test can help identify elevated or abnormal levels of the protein, which may indicate an ongoing immune response, inflammation, or other underlying health issues. Results are interpreted by your doctor based on your symptoms and medical history.
This test may not provide a definitive diagnosis on its own but can support further evaluation or monitoring of conditions affecting your immune or inflammatory systems.
How long will it take to get my results?
Results are typically available within a few days to a week, depending on your lab’s processing times. Your doctor will discuss the results with you during your follow-up visit.
Can I eat or drink before this test?
No special diet or fasting is required for this test. However, if you have any questions about timing your meals or medications, check with your healthcare provider.
  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