Confirmation and characterization of protein S (PS) congenital deficiency

Lt blue Sodium citrate (NaCit) - 2.7mL

• Evacuated collection tubes must be filled to completion to ensure a proper blood to anticoagulant ratio.
• Immediately following collection, mix sample thoroughly by gently inverting 8 - 10 times to prevent clotting
• A discard tube is not required prior to collection of coagulation samples, except when using a winged blood collection device (ie, "butterfly"), in which case a discard tube should be used.

Platelet poor citrated plasma samples (PPP) should be obtained by double centrifugation.

1. Centrifuge for 10 minutes and carefully remove 2/3 of the plasma using a plastic transfer pipette, being careful not to disturb the cells.
2. Deliver to a plastic transport tube, cap, and recentrifuge for 10 minutes.
3. Use a second plastic pipette to remove the plasma, staying clear of the platelets at the bottom of the tube.
4. Transfer the plasma into a LabCorp frozen purple tube with screw cap, labelled as PPP
5. Freeze immediately and maintain frozen until tested.

Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp)

Frozen (strict)

Immuno-turbidometric

0 to 3 days:             27 - 55
4 days to 6 months: 44 - 111
> 6 months:            60 - 150