Laboratory Test Information Guide

Details for Cryofibrinogen Crit

Test Name: Cryofibrinogen Crit
Alternate Name(s):  
Laboratory: Clinical Immunology
Specimen Type: 4 x 2.7 mL Light Blue (Sodium Citrate) Vacutainer tubes and 2 x 6 mL Red top Vacutainer tubes
Collection Information: If possible, patient should be fasting.
Caution: Specimen is not acceptable when drawn on a patient receiving heparin or any other anti-coagulant.

Immediately after the blood draw, label the red top tubes and place in a thermos with warm (not hot) water. Water should be 37°C. Send to the laboratory specimen receiving area.

Do not leave the specimens at room temperature or refrigerate.

Transport the samples as soon as possible.
Test Schedule: As required
Turnaround time from when specimen
is received in testing laboratory:
Crit & characterization N/A on prelim. report: 2 days
Final report positive cryoglobulin:10 days
Reference Range: 0-2%

When there is no cryofibrinogen present, the crit is not performed.
Effective Date: 2010-01-11
Revised Date: 2013-09-19
Critical Value:  
Interpretive Comments: The crit is the calculated relative percentage volume of cryofibrinogen to total sample volume.
The crit is performed on all positive cryofibrinogen samples with adequate specimen volumes.
The crit may not be calculated on samples with inadequate sample volume.
Special Processing: The specimen tubes must remain at 37°C until the plasma and serum have been separated.
Comments: Characterization is performed on serum only- positive cryofibrinogen plasma will not be characterized.
Method of Analysis: Manual
Critical Information Required: Is the patient on anticoagulant therapy?
Storage & Shipment: The specimen blood tubes must remain at 37°C until the plasma and serum have been separated. After separation, the specimen can be stored or shipped at ambient temperature or refrigerated.
System Codes: 
Referred To:  

Questions? Comments? Contact Laura Gopaul