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Test Code RIVA Rivaroxaban Anti-Xa

Important Note

For peak level, collect specimen after 2-4 hours of drug administration; for trough level, collect specimen before administering the next dose.

In single or multiple dosing, the time interval between specimen collection and administration of dose must be specified.

Specimen Requirements

Specimen Type: Whole Blood
Container/Tube: 2 Light Blue Top (3.2% Sodium Citrate)
Volume: 2 × 2.7mL Whole Blood (Tubes must be full)

Collection Instructions: Send whole blood specimens to laboratory immediately.

 

Specimen Type: Platelet Poor Plasma
Container/Tube: 2 Light Blue Top (3.2% Sodium Citrate)
Submission Container/Tube: Plastic Vial
Minimum Volume: 1.0mL Plasma
Collection Instructions:
1. Light blue top tube must be properly filled with whole blood.
2. Whole blood specimen should be double centrifuged and plasma separated from cells within 1 hour of collection.
3. Plasma should be separated into 2 aliquots with minimum volume of 1mL each.
4. Freeze the aliquots in well-closed plastic tubes immediately.

Reference Interval

Clinical interpretive report will be provided.

Days and Times Performed

Monday through Sunday, TAT 1 day

Methodology

Chromogenic Assay

Service Code

12507

Update

Last updated 11/03/2022

Unacceptable Condition

Haemolysis Gross reject
Icterus Gross reject
Lipaemic Gross reject
Others Clotted or insufficient reject

 

Specimen Stability

**Preferred temperatures for storage prior to and during shipping to NUH**

 

Specimen Type Plasma
Ambient 4 hours
Refrigerate 4 hours
Frozen 14 days

 

Testing Laboratory

National University Hospital, Singapore
Haematology, 67722323

Useful For

Monitoring of Rivaroxaban therapy

Alias

Rivaroxaban

Xarelto®