C1 Inhibitor Functional
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C1 Esterase Inhibitor – Functional, Plasma
Test ID: C1EFUN
Test
Aliases/Synonyms
Method
Chromogenic
Report Includes
C1 Esterase Inhibitor - Functional
Specimens
Plasma (Citrate)
Test Location
Laboratory Reference Centre, 237 Barton Street E, Hamilton ON L8L 2X2
Test Version
21-Mar-2023
Specimen
Specimens
Plasma (Citrate)
Collection Containers
Blue top (3.2% buffered citrate)
Sample Volume
1 mL
Collection & Handling
Collection Instructions
Separate plasma within 4 hours of collection.
Handling Information
Prepare platelet-poor plasma specimen and freeze immediately. Store and send frozen.
Stability
| Ambient | 4 hours |
|---|---|
| Frozen | > 4 hours at -70°C |
Additional Stability Information
If the specimen thaws, it is unsuitable for analysis. This assay is very sensitive to sample handling and storage conditions.
Rejection Criteria
| Specimen | Not frozen |
|---|
Test Version
21-Mar-2023
Performance / Interpretation
Method
Chromogenic
Turnaround Time
14 days
Results
| Name | Units | Reference Range | Conversion Factor | |
|---|---|---|---|---|
| C1 Esterase Inhibitor - Functional | U/mL |
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For assessment of angioedema correlate with other clinical features and with the results of quantitative levels of both C1 inhibitor protein and C4. This assay is very sensitive to sample handling and storage conditions. A repeat test (additional billing) with a fresh sample is recommended for results with borderline low/abnormal functional activity (0.69 - 0.74 U/mL).
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Test Location
Laboratory Reference Centre, 237 Barton Street E, Hamilton ON L8L 2X2
Test Version
21-Mar-2023
Interface / Setup
HL7 Interface Codes
| Order Code | Result Codes | Units |
|---|---|---|
| C1EFUN | 62115C1-INHIBITOR | U/mL |
Test Version
21-Mar-2023