Tube: Blue; citrated plasma - refrigerate. Tube must be filled to manufacturers recommended volume. Mix the tube by gentle inversion after collection. Clotted, hemolyzed specimens or tubes not filled to required volume will be rejected. Do not uncap. Test within 4 hours of collection. If unable to test within 4 hours, centrifuge the specimen for 10 minutes as soon as possible after collection. Transfer the plasma to a labeled plastic tube and freeze.