Help Please log in to determine if you are eligible to purchase PT Programs. CAP/ACMG RETT SYNDROME (MECP2) - RETT Analytes/procedures in bold type are regulated for proficiency testing by the Centers for Medicare & Medicaid Services (CMS). Analyte/Procedure Challenges per Shipment Number of Shipments Rett (MECP2) genotyping 3 Two shipments per year Rett (MECP2) duplication/deletion analysis 3 Program Information Three 10.0‑μg extracted DNA specimens Shipping Schedule Shipment A: March 2 Shipment B: September 14 Guest Log in/Register