Lithium, Serum

Test Code

CPT Codes

Preferred Specimen
1 ml serum from Serum Gel or Red Top

Minimum Volume
0.5 mL

  • Draw a minimum of 12 hours after last dose (trough specimens).
  • Peak serum concentrations do not correlate with symptoms.

Specimen Stability
Specimen Type Temperature Time
Serum SST Refrigerated 7 days
Red Top – Separated* Refrigerated 7 days
*Centrifuge and aliquot into a plastic vial.

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis

Bichromatic Endpoint

Setup Schedule
Monday through Sunday; Continuously

Report Available
Same day

Reference Range
Therapeutic concentration: 0.6-1.2 mmol/L (trough concentration)
Critical value (automatic call-back): >1.5 mmol/L

Performing Laboratory
Mckee Medical Center Laboratory
North Colorado Medical Center Laboratory
Sterling Regional Medical Center

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.