Item Value
Test name C1 Esterase Inhibitor Deficiency Panel
Available Stat? No
Turn around times Test performed Tuesday and Thursday. Turnaround time: 3-8 days.
Performed by Quest
Patient Preparation An 8 hour fast before specimen collection is preferred
Normal range C1EI activity (by decay of C1r):
Normal > 67%
Equivocal 41-67%
Abnormal < 41%


C1EI quantitation 11-26 mg/dL
C1q quantitation 5.0-8.6 mg/dL
Container type Red top on ice (Gold top NOT acceptable)
Lavender top on ice for B&T patients
Amount to Collect 6 mL blood
Collection Instructions Collect and allow to clot in ice slurry. Bring immediately to lab on ice.

Note special sample requirements for B&T patients
Sample type Serum
EDTA Plasma for B&T patients

If you have additional questions regarding this test, please call: 415-353-1667