Ephedrine/Pseudoephedrine Differentiation, Serum or Plasma
Also known as: White Cross
Use
Detect, quantitate, and differentiate between the stereoisomers ephedrine and pseudoephedrine.
Special Instructions
Serum or plasma samples must be protected from light by wrapping in foil. The specimen should be separated from cells within two hours of venipuncture and submitted in a plastic transport tube. Gel-barrier tubes are not recommended.
Limitations
This test may be limited by the requirement for proper specimen handling, including the need to protect the specimen from light and the requirement to separate serum or plasma from cells within two hours. Gel-barrier tubes are not recommended, and failure to adhere to specimen handling guidelines may affect test accuracy. Additionally, the test does not include confirmation of results through additional reflex testing unless explicitly requested.
Methodology
Mass Spectrometry
Biomarkers
LOINC Codes
- 3591-5
- 9389-8
Result Turnaround Time
10-14 days
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
3 mL
Minimum Volume
0.6 mL
Container
Red-top tube or green-top (heparin) tube
Collection Instructions
Serum or plasma should be separated from cells within two hours of venipuncture. Submit serum or plasma in a plastic transport tube. Wrap specimen in foil to protect from light.
Patient Preparation
Trough levels are most reproducible.
Storage Instructions
Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen. Protect from light.
Causes for Rejection
Gel-barrier tubes; specimen not light-protected