Lt blue Sodium citrate (NaCit) - 2.7mL

• If the patient's hematocrit exceeds 55%, the volume of citrate in the collection tube must be adjusted
  • Coag - Hematocrit anticoagulant adjustment
• Evacuated collection tubes must be filled to completion to ensure a proper blood-to-anticoagulant ratio
  • Coag - Tube fill guidelines
• Immediately following collection, mix sample thoroughly by gentle inverting 8 - 10 times, to prevent clotting

1. Spin
2. Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp), labelled as Na cit plasma, within two (2) hours of sample collection
3. Freeze

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

Frozen - 28 days

• Freeze/thaw cycles - stable x3

• Gross hemolysis
• Clotted specimens
• Specimens thawed in transit

Enzyme Immunoassay (EIA)

60 − 150 %

Protein C levels tend to be lower in newborns but typically reach adult ranges by six months of age. Levels in some children remain low until 16 years of age