Quest Diagnostics Valencia
3-6 mL Blood
Plasma collected in a sodium heparin (green-top) or lithium heparin (green-top) is also acceptable. Protect from light. Fasting for a minimum of 8 hours. Patient should refrain from eating liver and taking multivitamins or vitamin K at least 24 hours before sample collection.
Room Temp=Unacceptable; Refrigerated=Unacceptable; Frozen=90 Days
Gross hemolysis; Grossly lipemic; Serum
3 mL Plasma
1.5 mL Plasma
Separate plasma within 1 hour of collection. Freeze immediately and protect from light.
Vitamin K is a required co-factor for the synthesis of factors 2, 7, 9, and 10 and proteins C and S. Deficiencies of vitamin K lead to bleeding. CoumadinÂ® (warfarin) acts as an anticoagulant because it is a vitamin K antagonist.