Warfarin, Serum or Plasma
| Abbrev Code: | WARFN | ||
| Order Code: | LAB6069 | Order Name: | Warfarin Level |
| Synonyms: | Coumadin | ||
| Methodology: | High performance liquid chromatography/Tandem mass spectrometry | ||
| CPT Codes: | 80299 x1 | ||
| Turnaround Time: | Specimens are sent to the reference laboratory Mon-Sat; results are reported within 8-11 days. | ||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 2 mL |
| Minimum\Peds Volume: | 0.6 mL |
| Container: | Red (no gel) Alternate Containers: Purple (EDTA) |
| Causes for Rejection: | Use of serum separator tubes. |
Processing and Shipping
| Specimen Processing: | Centrifuge within 2 hours of collection and aliquot 1 mL; 0.2 mL minimum serum or plasma. Store at refrigerated temperature. Test is not performed at ARUP; separate specimens must be submitted when multiple tests are ordered. |
| Shipping Instructions: | Ship at refrigerated temperature. |
| Stability: | 1 month at room temperature or refrigerated; 15 months frozen. |
| Test Performed at or Referral Lab | Lab Sendouts (ARUP) |
| Referral Lab number: | 90805 |
Interpretive
| Reference Range: | By report. |
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