Test Overview
Test Methodology

Gas Chromatography/Mass Spectrometry (GC/MS)

Reference Range *

Hydrocodone, unconjugated: 10 - 100 ng/mL; Hydromorphone, unconjugated: 1 - 30 ng/mL; Dihydrocodeine, unconjugated: not established.

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

Test Details
Days Set Up
Tuesday - Saturday
Analytic Time

5 - 11 days

Soft Order Code
  • Hydromorphone, Serum
  • Dilaudid
  • Dihydrocodeine, Serum
Reference Laboratory
Mayo FHMTB (MedTox 45004)
Special Testing
Specimen Requirements
Collection Instructions

Collect a trough specimen in a green top or red top tube; do not use SST tube. Centrifuge, aliquot plasma or serum into a plastic vial and refrigerate.

Normal Volume
5 mL plasma or serum
Minimum Volume
1 mL plasma or serum
Rejection Criteria
SST or PST tube not acceptable.
Additional Information

Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.

CPT Code