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Test Code LI Lithium Level, LAB29



Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: Gold-top serum gel tube or plain, red-top tube

Acceptable: Green-top (sodium heparin) tube

Specimen: 0.1 mL of serum or plasma

Stability: Serum or plasma samples should be physically separated as soon as possible with a maximum limit of two hours from time of collection.  Separated specimens are stable at room temperature for 24 hours or can be stored at 2 – 8°C and analyzed within 7 days. For longer storage, samples may be frozen at -18°C for up to 6 months.

Collection Instructions: Hemolyzed specimen or lithium-heparin tube are not acceptable.



Reference Values

Therapeutic range: 0.6-1.2 mmol/L

Critical value: >2.0 mmol/L

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding


Useful For

Lithium is an effective drug for treating the manic phase of affective disorders, mania, and manic-depressive illness.

Lithium concentrations are monitored to ensure patient compliance and prevent toxicity.