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Lab Test Dictionary

C4 Function (C4F)


Hemolytic Assay

Specimen Type


Performing Lab

National Jewish Complement

Epic ID

Other Reference Test

Lab Test Days

3rd Wednesday of the Month

Standard TAT

4 Weeks

Collection Information

Specimen Required

1-2 mL Blood

Container Type

Red Top (No Additive)

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp=Unacceptable; Refrigerated=Unacceptable; Frozen=1 Year

Rejection Criteria

Thawed specimen; Serum separator tubes (SST)

Test Volume Required

1 mL Serum

Minimum Test Volume

0.25 mL Serum

Processing Instructions

Separate serum and freeze immediately. Complete a National Jewish Complement Lab requisition and submit with specimen frozen Monday-Friday, ok for Saturday delivery.

CPT Codes