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Test Code Factor I Factor I Complement Protein

Important Note

Must be processed and frozen within 30 minutes of collection.

Clinical System Name

Factor I Complement Protein

Sample Requirements

Specimen: Whole Blood

Container(s): Lavender/EDTA

Preferred Vol: 2.0 mL

Minimum Vol: 0.5 mL


Note: Lavender/EDTA is the only acceptable sample type.

Processing Instructions

Reject due to: Thawed specimen

Spin: Y

Aliquot: Y

Temp: -70 C

Storage Location: CPA -70 freezer, Send Outs rack.


Off-site collection: Centrifuge at room temp within one half hour of collection; preferably immediately after venipuncture. Transfer the cell-free plasma to a Cerner-labeled aliquot tube and immediately freeze at -70 C. Ship frozen sample to Seattle Children's Main Lab.


Specimen Type Temperature Time
EDTA Plasma Room temp Unacceptable
  Refrigerated Unacceptable
  Frozen 1 y



STAT Performed TAT
N Varies Up to 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


Method: Radial immunodiffusion (RID)

Analytical Volume: 0.25 mL Plasma


Reference Ranges

Reference Interval
Human Male: 29.3 - 58.5 mcg/mL
Human Female: 29.3 - 58.5 mcg/mL


CPT Codes


Send Out Instructions

Reference Test Name Factor I Level
Reference Test Code FIL
Instructions Send frozen via FedEx Priority Overnight. Must be shipped Monday - Thursday. National Jewish Health does not accept Saturday deliveries.