Lithium
Label Mnemonic: LITH
Epic Lab Code: LAB29
Downtime Form: A-1a Therapeutic Drug Assay Requisition
Chemistry
6240 RCP
356-3527
Specimen(s):
Plasma
Collection Medium:
Pink top tube 6 mL (K2-EDTA)
Alternate Collection Media:
Red top tube 5 mL (Clot Activator)
Minimum:
3 mL in a pink top tube or ONE EDTA Microtainer® devices
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
1 hour (upon receipt in laboratory)
Reference Range:
Usual therapeutic range 0.4 to 1.2 mEq/L at steady state
(12 hr after dose).

Critical value: >1.4 mEq/L
Test Limitations:
Hemolysis: No significant interference up to an H index of 1000 (approximate hemoglobin concentration: 1000 mg/dL).

Lipemia: No significant interference up to an L index of 2000. There is poor correlation between turbidity and triglyceride concentration.

Icterus: No significant interference up to an I index of 43 (approximate conjugated and unconjugated bilirubin concentration: 43 mg/dL).
Methodology:
Colorimetric
CPT Code:
80178
 
See Additional Information:
Chemistry Critical Lab Values