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Test Code C1F C1 Function

Important Note

Must be processed and frozen within 60 minutes of collection.

Clinical System Name

C1 Function


Complement C1 Function

Sample Requirements

Specimen: Whole Blood

Container(s): Red

Preferred Vol: 1.0 mL

Minimum Vol: 0.5 mL


Note: Gel separator is not acceptable. Send to the Lab immediately after collection.

Processing Instructions

Reject due to: Gel separator is not acceptable. Thawed specimen.

Spin: Y

Aliquot: Y

Temp: -70 C

Storage location: Spin blood immediately, transfer 0.5 mL serum to a plastic tube affixed with large Cerner label. Deliver specimen to the freezer Send Outs rack. Plasma should be frozen within 1 hour of blood draw.


Off-site collection: Spin blood immediately. Serum should be frozen within 1 hour of blood draw.


Specimen Type Temperature Time
Serum Room temp N
  Refrigerated N
  Frozen  1 yr



STAT Performed TAT
N 1st Th of the month 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

Reference Range

Reference Interval
Human Male: 75672 - 190932 Units/mL
Human Female: 75672 - 190932 Units/mL



Method: Hemolytic Assay

Analytical Volume: 0.25 mL Serum


CPT Codes


Send Out Instructions

Reference Test Name: C1 Function
Reference Test Number: C1F
Instructions: Send frozen via FedEx Priority Overnight. Must be shipped Monday - Thursday. National Jewish Health does not accept Saturday deliveries.