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Test Code Fndxt Fondaparinux Level

Clinical System Name

Fondaparinux Level



Sample Requirements

Specimen: Whole Blood

Container(s): Lt. Blue/Citrate

Preferred Vol: (2) 2.7 mL - properly filled tubes

Minimum Vol:  2.7 mL


Note: Do not use blue band on tube label for correct fill volume. Test results are affected by incorrect blood volume. Preferred method of collection is venipuncture with vacuum fill. VAD is not the preferred method of collection for coag testing. If this method is used it requires a 5 cc clearing volume; 3 cc for size 2 French catheter or smaller. Call Coagulation Lab with questions 987-2561. Specimen must be processed within 4 hours of blood draw.

Processing Instructions

Reject due to: Hemolysis

Spin: Y

Aliquot: Y

Temp:-70 C


Storage location: Centrifuge sample 10 minutes at 6000 RPM, remove plasma, respin plasma 10 minutes at 6000 RPM, freeze upper ¾ plasma in a plastic tube affixed with a large computer label in the sendouts rack in the -70° C freezer. If ordered STAT: when a Sendouts team member is present, notify them IMMEDIATELY, otherwise between 7 am and 8 pm send sample directly to UW NW220 for testing.


Off-site collection: Preferred method of collection is venipuncture with vacuum fill. Test results are affected by incorrect blood volumel. Specimen should be centrifuged within 4 hours of collection. Double spin, transfer upper 3/4 layer of plasma to plastic tube affixed with large computer label. Freeze 2 aliquots of 0.6 mL plasma in plastic tubes at -70C. Ship frozen on dry ice.


Specimen Type Temperature Time
Whole Blood Room temp

4 h

Plasma Refrigerated N

1 m



STAT Performed TAT
Y - w/ approval of Lab Medicine Resident

7 am - 4 pm daily

1 -3 d


Performing Laboratory

University of Washington

Dept of Laboratory Medicine
1959 NE Pacific St, NW220
Seattle, WA 98195


Phone Number: (206) 520-4600


Department:  Send Outs

Phone Number: (206) 987-2563




Reference Range


Prophylaxis Following Surgery  
For 3 Hours After Dose 0.39 - 0.50 mcg/mL
Trough Level 0.14 - 0.19 mcg/mL
Treatment of DVT  
For 3 Hours After Dose 1.20 - 1.26 mcg/mL
Trough Level 0.46 - 0.62 mcg/mL



Method: None specified

Analytical Volume: None specified


CPT Codes


















Send Out Instructions


Reference Test Name:

Fondaparinux Activity Assay

Reference Test Number:



Send out M - F with the UW courier.


If ordered STAT: send sample on dry ice directly to UW NW220 for testing via Delivery Express.