At Quest, Free T3 is drawn in a Serum separator tube (SST), order code 34429.
Quest collection requirements
Free T3 tube and order code at Quest
Quest verified by: Mandi Boss B Franklin, Jul 17, 2026
Compare this test
Need the full lookup, not just a comparison?
No login · Zero PHI · Clinician-verified · Quest + LabCorp + BioReference.