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Therapeutic drug management
Inductively coupled plasma/mass spectrometry (ICP/MS)
Expected range during chronic lithium therapy: 10−40 mEq/L
Use metal-free or acid washed containers for collection; transfer an aliquot of urine to a metal-free transfer tube
Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen.
Causes for Rejection
Use of non−metal-free collection containers or tubes