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Test Code ECUMP Eculizumab Monitoring Panel, Serum

Useful For

Therapeutic drug monitoring of eculizumab

Profile Information

Test ID Reporting Name Available Separately Always Performed
C5FX C5 Complement, Functional, S Yes Yes
C5AG2 C5 Complement, Antigen, S Yes, (Order C5AG) Yes
INT86 ECUMP Interpretation No Yes

Method Name

C5AG2: Nephelometry

C5FX: Automated Liposome Lysis Assay

Reporting Name

Eculizumab Monitoring Panel, S

Specimen Type

Serum Red

Specimen Required

Patient Preparation:

1. Fasting preferred

2. Recommended timeframe for the blood draw is a trough, or immediately prior to next intravenous infusion.

Specimen Type: Serum

Collection Container/Tube: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1.5 mL

Collection Instructions:

1. Immediately after drawing the specimen, place the tube on wet ice.

2. Spin down and separate serum from clot.

3. Freeze specimen within 30 minutes.

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Red Frozen 14 days

Clinical Information

Eculizumab (Soliris, Alexion Pharmaceuticals) is a humanized hybrid monoclonal antibody (IgG2/IgG4) that blocks complement C5 cleavage, thereby preventing the activation of the proinflammatory effects of C5a and the cytolytic effects of the membrane attack complex (MAC) formed by C5b-C9. It is FDA-approved for atypical hemolytic uremic syndrome,(1) paroxysmal nocturnal hemoglobinuria,(2) and neuromyelitis optica, and also prescribed for other conditions such as C3 glomerulopathies.(3) The dosing regimen for an average adult may vary from 300 to 1200 mg intravenously every 2 weeks during the maintenance stages, according to the condition for which the drug is prescribed. Therapy efficacy may be monitored by measuring efficiency of complement blockade.(4) Eculizumab will affect complement function assays that rely on the formation of the MAC to generate cell lysis. Although CH50 and sMAC have been recommended for eculizumab monitoring, the measurement of C5 function and C5 antigen will more specifically indicate the impact of eculizumab on the complement system blockage and may help guide the next dose of the drug.


This panel measures the pharmacodynamics effects of eculizumab on the complement system.

Reference Values


10.6-26.3 mg/dL



29-53 U/mL

Day(s) and Time(s) Performed


Analytic Time

2 days

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

See Individual Test IDs

CPT Code Information

86160-Complement; antigen, each component

86161-Complement; functional activity, each component

LOINC Code Information

Test ID Test Order Name Order LOINC Value
ECUMP Eculizumab Monitoring Panel, S In Process


Result ID Test Result Name Result LOINC Value
C5FX C5 Complement, Functional, S 60472-8
C5AG2 C5 Complement, Antigen, S 4505-4
INT86 ECUMP Interpretation In Process

NY State Approved