Test Overview

Test Methodology

Homogeneous Enzyme Immunoassay

Test Usage

Monitor therapeutic drug level

Reference Range*

Therapeutic: Peak: 5 - 10 mcg/mL; Trough: < 2 mcg/mL.
Critical: Peak/Random values: >10.5 mcg/mL; Trough values: >2.6 mcg/mL.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Test Performed

Daily, 24 hrs

Analytic Time

2 hours

Soft Order Code

TOBR/TOBPK/TOBTR

Synonyms

Laboratory

Chemical Pathology

STAT Availability

STAT requests for this test will be performed on a STAT basis (supervisory staff approval is not required).

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All specimens should be accompanied by a requisition.

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Specimen Requirements

Offsite Collection Instructions

Collect blood in an SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate. For maximum clinical significance, usual sampling times are Peak: 0.5 to 1 hour after the end of a 30 minute I.V. infusion (one hour following I.M. administration) or Trough: immediately before next dose is given. Indicate whether specimen is Peak, Trough, or Random level.

Container

Normal Volume

0.5 mL serum

Minimum Volume

0.25 mL serum

Billing Information

Fee Codes

CPT Code

80200

LOINC

Trough 4059-2; Peak 4057-6; Random 35670-9

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