Skip to Content
UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: Naltrexone and Metabolites, Free (Unconjugated) Screen

Test Code(s): MISC / RMISC

CPT Code(s): 80100

Test Description: Test Components: 6-Beta Naltrexol-Free Naltrexone-Free

Testing Site: Testing will be sent to an approved reference laboratory.

Days Performed: Mon, Wed, and Fri.

Specimen Requirements

Specimen: Blood

Collection Container: Preferred: Red top
Also Acceptable: Lavender top

Collection Volume: Preferred: 9 mL
Pediatrics: 4 mL

Sample Analyzed: Serum or plasma

Volume Required: Preferred: 3 mL
Pediatrics: 1.5 mL

Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220). Transport with coolant pack if coming from outreach location.

Unacceptable Criteria: Blood drawn in gel separation tube (SST or PST)

Stability: Ambient: 7 days
Refrigerated: 10 days
Frozen: 30 days


6-Beta Naltrexol Depade® Nalorex® ReVia® Trexan® Vivitrol®

Back to Lab Test Directory Index