C1r Level
Test Code
C1RL
Description
Collect
Plasma from a lavender top (EDTA) tube is the only acceptable sample type. Mix sample thoroughly.
Specimen Preparation
Centrifuge at room temp within one half hour of collection; preferably immediately after venipuncture. Transfer the cell-free plasma to a clean tube and immediately freeze the cell-free plasma on dry ice or at -70°C.
Preferred volume: 1 mL plasma, frozen
Pediatric Collection
Minimum volume: 250 µL plasma, frozen
Unacceptable Conditions
Thawed specimen.
Storage Transport Temp
Send frozen plasma Priority Overnight via FedEx and in a well insulated container on dry ice.
Stability
Frozen at -70°C: 1 year
Methodology
Radial Immunodiffusion (RID)
Reported
Up to 4 weeks
Synonyms
Radial Immuno Assay (C1r Level);Complement (C1r Level)
Reference Interval
Human Male: 61-162 % of STD
Human Female: 61-162 % of STD
CPT Code
86160