Fibrinogen Activity, Clauss

What it measures

• Fibrinogen Activity, ClaussLOINC 3255-7

Specimen

Specimen

One full 3.2% sodium citrate (light blue-top) tube

Minimum volume

0.5 mL if as a single test

Also accepted

1 mL platelet-poor anticoagulated plasma collected in a 3.2% sodium citrate (light blue-top) tube, separated and frozen immediately

Container

Whole blood: 3.2% sodium citrate (light blue-top) tube Plasma: Transport tube (frozen)

Temperature

Whole blood: Room temperature Plasma: Frozen

Correct ratio of blood to citrate is critical. Do not overfill or underfill collection tube. Mix by inversion 4 times. Do not pool plasma from multiple tubes. For non-heparinized patients, maintain specimen at room temperature. Do not uncap. Non-heparinized patients are stable up to 72 hours at room temperature. Heparinized patients stable for 24 hours at room temperature. If testing cannot be completed within stability limits, centrifuge specimen within 1 hour of collection at 2500-3500 rpm. Transfer plasma to a plastic screw-cap vial and freeze at -20° C immediately.

Turnaround

Set up: Daily (Day shift and Night shift); Report available: 2 days

Billing

CPT 85384