INSULIN-LIKE GROWTH FACTOR 1, SERUM Mnemonic INSGF Synonym IGF-1 - IGF 1 - Somatomedin-C - Insulin-Like Growth Factor 1 Specimen Collection Requirements Collect Serum, one 4 mL gold (SST) top tube Handling Separate serum from cells. Preferred Volume 0.50 mL Minimum Volume 0.35 mL Transport Frozen Stability Ambient: 72 hours; Refrigerated: 72 hours; Frozen: 28 days Testing Information Performed Sun - Fri Reported 2-4 days Method Liquid Chromatography-Mass Spectrometry (LC/MS) Referral Lab Mayo Medical Laboratories (IGFMS) Reference Values Reference Values Interpretation provided. CPT Codes 84305 Last Updated: Thursday, January 5, 2017 03:42:17 AM