Sign in →

Test Code LI Lithium Level

Important Note

No add-ons after 8 hours of collection if specimen is still on gel separator.


Lt. Green/Li Heparin Microtainers contain lithium heparin and are NOT acceptable.

Clinical System Name

Lithium Level

Sample Requirements

Specimen: Whole Blood

Container(s): Gold SST, Dark Green/Sodium Heparin, Red, Lavender/EDTA,  Gold Microtainer,Lavender/EDTA Microtainer

Preferred Vol: 1.0 mL

Minimum Vol: 0.5 mL


Note: Draw specimen just before next dose.

Processing Instructions

Reject due to: Age of specimen, incorrect specimen collection (No Lt. Green/Li Heparin Microtainers).

Spin: Y

Aliquot: Y 

Temp: 2-8oC

Storage location: Core 5 Chemistry Refrigerator


Off-site collection:  If using a green top tube, ensure that it does not contain lithium heparin (sodium heparin OK). Draw specimen just before next dose. Spin blood, refrigerate serum or plasma at 2-8oC.


STAT Performed TAT
Y 24/7 1 H



Specimen Type Temperature Time
Serum or Plasma RT

8 H

Serum or Plasma 2-8oC

 24 H

Serum or Plasma -20oC or -70oC

180 D



Critical Values

≥ 1.9  mEq/L

Reference Range

Therapeutic: 0.5 - 1.5 mEq/L

Performing Laboratory

Seattle Children's Laboratory    


Department:  Core Chemistry

Phone Number: 206-987-2617


Method: Colorimetric method by Vitros 4600

Analytical Volume: 0.05 mL serum or plasma

CPT Codes