Follow-up test for complement activity screening when CH50 is normal and AH50 is low.
Quantitative Radial Immunodiffusion
New York DOH Approval Status
Serum separator tube.
Allow specimen to clot for 30 minutes to one hour at refrigerated temperature. Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube and place on refrigerant pack or freeze immediately. (Min: 0.3 mL)
Room temperature specimens. Specimens exposed to repeated freeze/thaw cycles.
After separation from cells: Ambient: Unacceptable; Refrigerated: 48 hours; Frozen: 1 year
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
|Component Test Code*||Component Chart Name||LOINC|
|0051721||Complement Factor B||2269-9|
- Alternative Pathway - Complement
- Complement alternative pathway
- Properdin Factor B