Metoprolol (Lopressor)
Test ID:
703845
CPT code:
80375
Synonyms:
- Lopressor®
- Toprol®
Clinical Use:
Therapeutic drug management
Specimen Type:
Serum or plasma
Requested Volume:
2 mL
Minimum Volume:
0.5 mL
Container Type:
Red-top tube or green-top (heparin) tube. Gel-barrier tubes are not recommended.
Patient Preparation:
Trough levels are most reproducible.
Collection:
Serum or plasma should be separated from cells within two hours of venipuncture. Submit serum or plasma in a plastic transport tube.
Storage Instructions:
Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen.
Stability Requirements:
Temperature |
Period |
---|---|
Room temperature |
Unstable |
Refrigerated |
Unstable |
Frozen |
6 months |
Freeze/thaw cycles |
Stable x1 |
Rejection Criteria:
Gel-barrier tube; thawed specimen.
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