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Laboratory Medicine

Test catalogue

C1 Esterase Inhibitor-Functional, Plasma

Test Name

C1 Esterase Inhibitor-Functional, Plasma

Blue Tube Specimen Type / Requirements

Container Type = Platelet Poor Plasma, 3.2% Sodium Citrate, Light Blue top

Minimum Volume = 1mL Plasma

9:1 Ratio (9 parts blood to 1 part anticoagulant)

Specimen Handling

Collection Instructions: Collect sample in Platelet Poor Plasma (3.2% Sodium Citrate) light Blue top. Write your initials, date and time of collection on the collection label.

Laboratory Staff Instructions: Separate platelet-poor plasma immediately. Freeze as soon as possible. Store and send frozen.

Rejection Criteria: Serum, gel-separator, unlabeled or samples of non sufficient quantity.

Stability: If the specimen thaws, it is unsuitable for analysis. This assay is very sensitive to sample handling and storage conditions.

Transportation: Send sample to core lab as soon as possible.

Required Documentation

Turnaround Time (TAT)

11 days

Test Utilization

Reference Value

0.75 - 1.59 U/mL

Test Code




Testing Location

Referred Out – ON, Canada (ROICL02)

Other Information

Last Updated: Jan 15, 2020