Test Name


Specimen Type & Acceptability

7 days refrigerated

General Use

Therapeutic drug monitoring of patients taking Lithium.

CPT Code(s)


Special Instructions

Let clot for 10-20 minutes. After the sample is fully clotted, centrifuge the sample. Verify complete separation of cells and serum and refrigerate. Please provide all dosing information, i.e. last dose and time.

Lithium Therapeutic peak level:

  • Immediate release: ~0.5 to 3 hours
  • Extended-release: 2 to 6 hours
  • Solution: 15 to 60 minutes

Container/Tube Type


0.5 mL Min. vol. = 100 ul

Suggested Tube Types


Typical Volume

Gold Top Serum Separator Tube (SST)

⋜ 5 mL

Tiger Top Serum Separator Tube (SST)
^For larger volume tests

> 5 mL

Red Top Tube (No additive)

⋜ 5 mL

EDTA Whole Blood

3 mL

3.2 % Sodium Citrate Whole Blood

2.7 mL

Lithium Heparin Plasma Separator Tube

⋜ 5 mL