Complement C1Q Antigen Level, Blood - Saskatoon

Overview

Description

Test ordering requirements

Forms required

• Requisitions must have specific test indicated
• SHR Laboratory Medicine Community Laboratory Requisition Form #101064 or Acute Care Phlebotomy Requisition Form #101062
   

Alias

• C1Q Level

Specimen Information

Specimen types accepted

• Plasma

Specimen collection container

• Preferred Collection Container: Lavender (EDTA) 4.0 mL

Collection procedure

• Specimen for this test must be centrifuged, aliquoted and frozen within 30 min of collection; preferably immediately after venipuncture.  If unable to meet these requirements, patients for this test must be referred to RUH or SPH Test Centre for collection.

Required volume

• Optimal Volume: 4.0 mL Full Collection Tube
• Minimum Volume: 1.0 mL plasma
• Pediatric Volume: 0.25 mL plasma

(Submitting the minimum volume makes it impossible to repeat the test or perform confirmatory/reflex testing. In some situations, a minimum volume may require a second collection. Chemistry may be able to do up to 10 tests with 0.75 mL blood.)
 

Transport and stability

• Store frozen
• Ship to the referral lab on dry ice
• Frozen at -70°C: 1 year
   

Rejection criteria

• Pathology and Laboratory Medicine Acceptance and Rejection Criteria

Performance

Methodology

• Radial Immunodiffusion (RID)

Days/times performed

Availability	Shipped overnight Mondays and Wednesdays 25 day turnaround time once received at testing laboratory
Testing site	Referred out by St. Paul’s Hospital Laboratory to Dynacare (London, ON)

 

Maximum laboratory time

Results reporting

• 25 day turnaround time by referral laboratory
• Shipped overnight Monday and Wednesdays

Other information

Additional comments

• Useful for the assessment of an undetectable total complement level
• Aid in the diagnosis of congenital C1 (first component of complement) deficiency and acquired deficiency of C1 inhibitor

Last Updated: March 5, 2026