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C3-Complement, plasma or serum

Alternate test name


Lab area
Clinical Biochemistry - General
Method and equipment

Abbott Ci4100

Expected turn-around time
STAT/Urgent: 4 Hours Routine: 24 Hours
Specimen type

Serum or plasma

Specimen requirements

SST Tube preferred, PST Tube is acceptable

Storage and transportation


Shipping information
The Hospital for Sick Children
Rapid Response Laboratory
555 University Avenue, Room 3642
Toronto, ON
M5G 1X8
Phone: 416-813-7200
Toll Free: 1-855-381-3212
Hours: 7 days/week, 24 hours/day
Background and clinical significance

Complement C3 is a blood test that measures the activity of a certain protein.

This protein is part of the complement system. The complement system is a group of nearly 60 proteins that are in blood plasma or on the surface of some cells. The proteins work with your immune system and play a role to protect the body from infections, and to remove dead cells and foreign material. Rarely, people may inherit deficiency of some complement proteins. These people are prone to certain infections or autoimmune disorders.

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