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C1 ESTERASE INHIBITOR PANEL
Test CodeLAB850
Includes
C1 Esterase Inhibitor, Functional
Complement Component C4c
C1 Esterase Inhibitor, Protein
Complement Component C4c
C1 Esterase Inhibitor, Protein
Preferred Specimen
3 mL frozen serum collected in a red-top tube (no gel)
Patient Preparation
Overnight fasting is preferred
Minimum Volume
1.2 mL
Instructions
Freeze serum within an hour of time drawn. Do not use gel barrier tubes. Do not submit the sample in a glass tube. Do not thaw.
Transport Container
Transport tube
Transport Temperature
Frozen
Specimen Stability
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 21 days
Refrigerated: Unacceptable
Frozen: 21 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Lipemia • Received room temperature
Methodology
Immunoassay (IA) • Immunoturbidimetry • Nephelometry
Limitations
Patients taking anabolic steroids may have falsely elevated C4 values.
Clinical Significance
This panel is designed to assist in the diagnosis of hereditary angioedema.
