General Information

UPHSM LIS Test #: 027180
Testing Time: 2-5 Days
Testing Lab: Labcorp

Specimen Info
Only 1 specimen type required, unless otherwise specified

Volume: 1.0 mL
Temperature: Ambient
Tube Type: Serum or Plasma
Collection Info:
Minimum Volume: 0.3 mL (Note: This volume does not allow for repeat testing.)
Container: Red-top tube, lavender-top (EDTA) tube, or green-top (heparin) tube. Do NOT use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.

Specimen Acceptability

Causes for Rejection:
Gel-barrier tube; whole blood samples; unspun samples that are not separated from cells


Homogeneous Immunoassay

CPT Codes


* The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding
is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Reference Range

Therapeutic: trough: 2.0-20.0 μg/mL