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Test Code C2 C2 Complement

Important Note

Specimen must be received by the Main Lab within 30 minutes of collection.


CPA: Separate plasma from cells and freeze within ONE hour of collection.

Clinical System Name

C2 Complement


Complement (C2 Level)

Radial Immuno Assay (C2 Level)

Sample Requirements

Specimen: Whole Blood

Container(s): Lavender/EDTA

Preferred Vol: 2.0 mL

Minimum Vol: 1.0 mL


Note: Send to Main Lab ASAP for processing. Plasma must be separated from cells and frozen within ONE hour of collection.

Processing Instructions

Reject due to: Plasma not separated within 60 minutes of collection.

Spin: Y

Aliquot: Y

Temp: -70 C

Storage Location: CRITICAL FROZEN. Plasma must be frozen within ONE hour of collection. Place the aliquot in the CPA -70 freezer, Send Outs rack.



Off-Site Collection: Spin and refrigerate serum or plasma within 1 hour of collection and transfer specimen into plastic aliquot container. Transport refrigerated.


Specimen Type Temperature Time
EDTA Plama Room Temp Unacceptable
  Refrigerated Unacceptable
  Frozen 1 y



STAT Performed TAT
N  Varies 4 w


Performing Laboratory

National Jewish Health

Complement Laboratory

1400 Jackson Street, Room D411

Denver, CO 80206


Phone Number: (800) 550-6227


Department: Send Outs

Phone Number: (206) 987-2563

Reference Range

Reference Interval
Human Male: 22.2 - 39.8 ug/mL
Human Female: 22.2 - 39.8 ug/mL



Method: Radial Immunodiffusion (RID)

Analytical Volume: 0.25 mL EDTA Plasma


CPT Codes


Send Out Instructions

Reference Test Name:

C2 Level

Reference Test Number: C2L

Send out Monday through Thursday via FedEx Priority Overnight.