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Humoral Immune Responses

Humoral Immune Responses

Complement System

Complement System

The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...

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Related Experiment Video

Updated: Jun 30, 2026

Measuring the 50% Haemolytic Complement (CH50) Activity of Serum

Measuring the 50% Haemolytic Complement (CH₅₀) Activity of Serum

Published on: March 30, 2010

Complement studies of sera and other biologic fluids.

P H Schur

Human Pathology

|April 1, 1983

Summary

Measuring complement proteins, like CH50, C4, and C3, aids in diagnosing and monitoring inflammatory and immunologic diseases, including lupus and vasculitis. Low levels can indicate inherited defects or acquired conditions, guiding treatment strategies.

Area of Science:

Immunology
Biochemistry

Background:

The complement system, comprising over 15 proteins, plays a crucial role in inflammation through sequential activation and interactions.
Complement levels are clinically relevant in various rheumatic and immunologic conditions, particularly those involving immune complex disorders.

Purpose of the Study:

To highlight the diagnostic and monitoring utility of complement system measurements in clinical practice.
To outline the interpretation of complement component levels, differentiating inherited defects from acquired processes.

Main Methods:

Measurement of total hemolytic complement (CH50) as an initial diagnostic step.
Analysis of specific complement components (C4, C3) for detailed assessment.
Serial monitoring of complement levels in patients with autoimmune diseases.

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Last Updated: Jun 30, 2026

Measuring the 50% Haemolytic Complement (CH50) Activity of Serum

Measuring the 50% Haemolytic Complement (CH₅₀) Activity of Serum

Published on: March 30, 2010

Methods for Quantitative Detection of Antibody-induced Complement Activation on Red Blood Cells

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Developing a Salivary Antibody Multiplex Immunoassay to Measure Human Exposure to Environmental Pathogens

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Main Results:

Low CH50 levels prompt further investigation into specific complement components.
A single decreased component may suggest an inherited deficiency, while multiple low levels often indicate acquired conditions.
Serial measurements of CH50, C4, and C3 are valuable for tracking disease activity in systemic lupus erythematosus and vasculitis.

Conclusions:

Complement testing is essential for diagnosing and managing inflammatory and immunologic diseases.
Understanding complement component levels aids in distinguishing between genetic and acquired deficiencies.
Complement system analysis provides critical insights for patient monitoring and therapeutic guidance.