Warfarin, Serum/Plasma
Also known as: Coumadin®
Use
Quantitative measurement of warfarin in serum or plasma, used for therapeutic drug monitoring to assess anticoagulant levels and guide dosing adjustments in patients receiving warfarin.
Special Instructions
Specimen must be 1 mL (minimum 0.2 mL) of serum collected in a plain red‑top (no gel) tube, or plasma in an EDTA (lavender‑top) or pink‑top tube. Separator tubes (polymer gel or serum separator) are unacceptable. Prompt centrifugation and transfer to plastic screw‑cap vial is required. Transport at room temperature. Separate for serum or plasma.
Limitations
Not specified in available content.
Methodology
Mass Spectrometry
Biomarkers
LOINC Codes
- 85403900
Result Turnaround Time
7 days
Related Documents
For more information, please review the documents below
Specimen
Serum
Volume
1 mL
Minimum Volume
0.2 mL
Container
plastic screw‑cap vial
Collection Instructions
Serum collected in red‑top tube (no gel); promptly centrifuge and transfer serum into plastic screw‑cap vial.
Storage Instructions
Transport at room temperature.
Causes for Rejection
Polymer gel separation tube; serum separator tube.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 30 days |
| Refrigerated | 30 days |
| Frozen | 15 months |