Sign in →

Test Code LIDOQ Lidocaine

Additional Codes

Epic: LAB685

Quest: 605

Specimen Required

Patient Preparation: Collect as a trough just prior to next dose.

Specimen Type: Serum

Collection Container/Type

Preferred: Red top

Acceptable: Plasma collected in: EDTA (lavender-top) tube, sodium heparin (green-top) tube, or sodium fluoride/oxalate (gray-top) tube.

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Specimen Minimum Volume

0.2 mL

Specimen Stability

Room temperature: 5 days

Refrigerated: 7 days

Frozen: 30 days

Reference Range

1.5-5.0 mg/L

Rejection Due To

Serum Separator Tube (SST®)

Day(s) and Time(s) Performed


Report Available

1-2 days

Clinical Significance

Lidocaine direct injection or infusion is used in the emergency treatment of ventricular arrhythmias caused by acute myocardial infarction, open-heart surgery. It is also used for topical anesthesia administered as a gel or by injection. Lidocaine levels are monitored to assure adequate therapeutic levels are achieved and to avoid toxicity.

Method Name

Immunoassay (IA)

CPT Code(s)


Performing Laboratory

Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153