[C3 and C4 levels in healthy children of various ages]

Area of Science:

• Pediatric immunology
• Complement system research
• Clinical chemistry

Background:

• The complement system is crucial for innate immunity.
• Understanding complement component levels in children is vital for assessing immune function.
• Complement component 3 (C3) and C4 are key components of the classical and lectin pathways.

Purpose of the Study:

• To investigate age-related changes in complement component 3 (C3) and C4 levels in healthy children.
• To establish normative pediatric reference ranges for C3 and C4.
• To determine if C3 and C4 levels vary significantly across different pediatric age groups.

Main Methods:

• Serum samples were collected from 63 healthy children across various age groups.
• Complement component 3 (C3) and C4 levels were quantified using immunodiffusion plates (M-Partigen Behring).
• Statistical analysis was performed to assess age-related variations.

Main Results:

• Complement component 3 (C3) levels demonstrated a significant increase with age in children.
• The lowest C3 levels were observed in the youngest age group (infants).
• Complement component 4 (C4) levels did not exhibit statistically significant changes across the different pediatric age groups studied.

Conclusions:

• Complement component 3 (C3) levels naturally increase during childhood development.
• Complement component 4 (C4) levels appear to be relatively stable in healthy children irrespective of age.
• These findings contribute to understanding normal complement maturation in pediatric populations.