[Investigation of the complement system in clinical practice]

Area of Science:

• Immunology
• Clinical Medicine

Background:

• The complement system is vital for host defense against pathogens and clearing immune complexes.
• Deficiencies in complement proteins are linked to increased susceptibility to infections and autoimmune diseases.

Purpose of the Study:

• To provide an overview of complement's medical applications.
• To emphasize complement's role in disease pathogenesis.
• To highlight the diagnostic utility of complement protein measurements.

Main Methods:

• Review of complement system functions in immunity and disease.
• Discussion of diagnostic assays for complement assessment.
• Focus on practical applications and underlying disease mechanisms.

Main Results:

• Complement system defects correlate with infections and autoimmune conditions.
• CH50, C3, and C4 measurements are key for screening complement abnormalities.
• Decreased complement levels often indicate consumption, while isolated CH50 absence suggests deficiency.

Conclusions:

• Complement investigation is essential for diagnosing and managing autoimmune diseases.
• Specific complement assays aid in identifying deficiencies and monitoring disease progression.
• Understanding complement's role is critical for effective clinical management.