Sign in →

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.

Laboratory Code

LAB3040080

Specimen Requirements

Specimen Type: Whole Blood
Container/Tube: 2 Light Blue Top (3.2% Sodium Citrate)
Volume: 2 × 2.7 mL 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: 1.0 mL 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 hr of collection.
3. Plasma should be separated into 2 aliquots with minimum volume of 1.0 mL each.
4. Freeze the aliquots in well-closed plastic tubes immediately.

Specimen Stability

Specimen Type Plasma
Ambient 4 hours
Refrigerate 4 hours
Frozen 14 days (preferred)

Methodology

Chromogenic Assay

Days and Times Performed

24 hrs, TAT 1 day

Specimen Condition

Haemolysis Gross reject
Icterus Gross reject
Lipaemia Gross reject
Others: Clotted or insufficient Reject

Reference Interval

Clinical interpretive report will be provided.

Testing Laboratory

National University Hospital, Singapore
Haematology, 67722323

Useful For

Monitoring of Rivaroxaban therapy

Service Code

12507

Alias

Rivaroxaban

Xarelto®

Update

Last updated 21/03/2025