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Test Code Li Lithium Level

Patient Preparation

No special patient preparation required

Special Collection Instructions

Do not collect in lithium heparin. Separate from cells if more than 4 hour delay is expected.

Collection Method

Venous collection

Minimum Volume

  • Adults: 0.8 mL
  • Pediatric: 0.5 mL

Container

Gold Top / Serum Separator / Additive Free

Preferred Specimen

Gold Top SST

Acceptable Specimens

Serum:

  • Gold Top SST

  • Red Top

Plasma:
  • Purple or Pink top (K2/K3 EDTA)
  • Dark Green Top (sodium heparin)

Reference or Target Ranges

Therapeutic Expected Value 0.6 – 1.2 mmol/L

Reportable Units

mmol/L

Critical Value

≥2.0 mmol/L

Reasons for Rejection



<!-- Rejection-->
Hemolysis Threshold
 1000 mg/dL
Icterus Threshold
 43 mg/dL
Lipemia Threshold
 2000 mL
Other
 QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability



<!-- Stability -->
Ambient
 24 hours
Refrigerated (4°C to 8°C)
 7 days
Frozen(-40°C to 0°C)
 6 months

Performance Information



<!-- Performance information -->
Days and Time Performed
 24/7
Expected Turn Around Time
 Stat: 1 hour
Routine: 4 hours
Stat Availability
 Yes
Performing Bench
 UH Chemistry
Methodology/Method Description
 Roche Cobas – Colorimetric assay

Additional Information/Important Notes

Peak levels occur 2-4 hours after an oral dose. The half life in serum is 48-72 hours and it is cleared through the kidneys. Reduced renal function can prolong clearance time.

CPT Codes

80178