Test Name: Lithium
Health Link Test Code: LI
LIS Test Code: LI
CPT Code(s): 80178
Manic depressive affective disorder.
Days Performed: Daily, 24 hours.
In-Lab Turnaround Time: 4 hours.
Stat In-Lab Turnaround Time: 1 hour.
Collection Container: Red cap with yellow ring (SST)
Also Acceptable: Red top
Collect specimen for trough level prior to morning dose. This level should be collected 12 hours after the evening dose.
Collection Volume: 2 mL
Pediatric Collection Volume: 0.5 mL
Sample Analyzed: Serum
Testing Volume: 1 mL
Pediatric Testing Volume: 0.2 mL
Centrifuge. If a complete barrier has not formed, transfer cell-free serum to plastic vial. Refrigerate.
Transport specimen to the laboratory. Transport with coolant pack if coming from clinic location.
Green top tubes (with black, white or yellow-ring) are not acceptable.
Interpretation Type: Reference Interval
Critical Calls: yes
Result of BELOW indicates that the result is below the method detection limit of 0.20 mmol/L. Serum lithium concentrations peak 2-4 hours after dose. Half-life is 24 hours in adults, 18 hours in adolescents, and greater than 36 hours in the elderly.