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Laboratory Test Directory

Complement Activity, Alternative Pathway (AH50)


Name Method Department Units
AH50 Radial Immunodiffusion
Send Out %

Specimen Requirements

Serum Spun

Container Type Container Size Specimen Volume

Red tube, (no anticoagulant), No Gel

3 mL 1 mL

Gold tube, (SST) with Gel

3.5 mL 1 mL

Red Tube (no anticoagulant) with Gel

3 mL 1 mL

Room temperature - 2 hour(s)
Frozen - 2 week(s)

Specimen Preparation

  • Allow specimen to clot for one hour at room temperature
  • Centrifuge within 2 hours, separate supernatant and freeze
  • Transport to laboratory as soon as possible

Reasons for Rejection

  • Refrigerated specimen
  • Thawed and refrozen specimen
  • Wrong collection tube

CPT Code

  • 86161