THYROXINE, FREE BY EQUILIBRIUM DIALYSIS Mnemonic MISC Specimen Collection Requirements Collect Serum, one 5.0 mL gold (SST) or 7.0 mL red top tube Preferred Volume 2.0 mL Minimum Volume 0.3 mL Transport Refrigerated Rejection Criteria Plasma Stability AFTER SEPARATION FROM CELLS: Ambient: 4 days; Refrigerated: 2 weeks; Frozen: 1 month Testing Information Performed Sun, Tue, Thu Reported 2-5 days Method Quantitative Equilibrium Dialysis/High Performance Liquid Chromatography-Tandem Mass Spectrometry Referral Lab ARUP (93244) Reference Values Reference Values Interpretation provided. Age related ranges. CPT Codes 84439 Last Updated: Thursday, January 5, 2017 03:42:31 AM