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Bloodworks Northwest Laboratories

Hemostasis Reference Laboratory

Sample Requirements

Test 3.2% Sodium Citrated Sample
(blue top)
Whole Blood EDTA
(purple top)
Sample Age Comments
All Coagulation Testing other than Platelet Aggregation or DNA test. 1-2 Tubes
5 ml ea. as whole blood OR
1 ml plasma into 4 plastic tubes. See Comments
Less or equal to 3 hours, sent at room temp (18-25°C) OR
Frozen Plasma, Sent on Dry Ice
Centrifuge tubes (2X) at 1500g for 15 minutes and aliquot plasma.
Platelet Aggregation n/a n/a See comments Drawn at the Blood Center. Call Hemostasis Laboratory at 206-689-6594 to Schedule an Appointment.
PFAs 1-2 Tubes
5 ml ea. as whole blood
5 ml Less or equal to 2 Hours SENT AT ROOM TEMP (18-25°C) Special shipping procedure required call 206-689-6594 for instructions. Must be received within 2 hours of draw OR Drawn at the Blood Center. Call Hemostasis Laboratory at 206-689-6594 to Schedule an Appointment.
DNA Testing
DNA/Factor V Leiden Mutation; DNA/Factor II Mutation Testing n/a 5 ml 48 Hours
(4°C)
Hemophilia A or B Mutation; DNA VWD Mutation n/a 10 ml 48 Hours
(4°C)
Fetal Cell Genotyping n/a n/a n/a 2 confluent T-25 flasks, cultured amniocytes
  • Minimum requirements are two (2) plasma tubes with at least 0.5 ml of plasma in each tube for each two (2) tests ordered.
  • Insufficient sample aliquots will negatively affect turnaround time.
  • Therapeutic anticoagulation interferes with most kinetic (but not DNA) tests.
  • Several tests are run infrequently, depending upon clinical needs and requests.
  • Analytic time may be prolonged when several or more complex tests are requested.


Transporting Samples

All samples must be sent in a sealed, leak-proof container marked with a biohazard sticker to comply with OSHA safety standards to:

Bloodworks Northwest
Attn Hemostasis Laboratory
921 Terry Ave
Seattle WA 98104
206-689-6594

Your gift of blood, time or money saves lives.