Complement components C1q AND C2 – serum

Last updated: Monday, 29, May, 2006

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Item Process

5 mL blood in plain tube.

The specimen should be placed on melting ice and transported immediately to the laboratory.


Immunoassay; functional assay.

Reference Interval

Consult pathologist.


Limited use in defining inherited or acquired deficiency.


Reduced or absent in complement consumption or deficiency.


Ruddy S. In: Rose NR et al eds. Manual of Clinical Laboratory Immunology. 5th ed. ASM Press 1997.

Wen L et al. Journal of Allergy and Clinical Immunology. 2004; 113: 585-93.