Ethosuximide Drug Level
Label Mnemonic: ETHOS
Epic Lab Code: LAB3093
Downtime Form: A-1a Therapeutic Drug Assay Requisition
Commercial Mail-out Laboratory
5231 RCP
Collection Medium:
Red top tube 5 mL (Clot Activator)
Preferred Minimum: 1.0 mL of serum
Absolute Minimum: 0.5 mL serum

Patient Preparation
Timing of specimen collection: Pre-dose (trough) draw - At steady state concentration.
Rejection Criteria:
Whole blood. Gel separator tubes, light blue (citrate), or yellow (SPS or ACD solution).
Turn Around Time:
1-5 days upon receipt at reference laboratory
Reference Range:
40-100 μg/mL
Toxic: >150 μg/mL
Interpretive Data:
The therapeutic range is based on serum pre-dose (trough) draw at steady-state concentration. Toxic concentrations may cause dizziness, drowsiness and anorexia. The incidence of adverse reactions is low; however, life-threatening agranulocytosis and fatal pancytopenia have been reported.
Submit With Order
Please indicate in the supplied fields:
1. Dose - List drug amount and include the units of measure
2. Route - List the route of administration (IV, oral, etc.)
3. Dose Frequency - Indicate how often the dose is administered (per day, per week, as needed, etc.)
4. Type of Draw - Indicate the type of blood draw (Peak, Trough, Random, etc.)
Quantitative Enzyme ImmunoAssay
CPT Code: