Supplemental Table S1: Participating Guideline Developers and Brief Description Discretionary Advisory Committee on Heritable Disorders in Newborns and Children (DACHDNC) The DACHDNC provides recommendations to Secretary of Health and Human Services on what on the most appropriate application of universal newborn screening tests, technologies, policies, guidelines and standards. In January 2013, DACHDNC approved use of decision matrix to evaluate the net benefit and certainty of each condition placed on the NBS panel. American College of Medical Genetics and Genomics (ACMG) * ACMG is an organization composed of biochemical, clinical, cytogenetic, medical and molecular geneticists, genetic counselors and other health care professionals committed to the practice of medical genetics. The ACMG guideline development group is a multidisciplinary group which includes a review by a conflict of interest committee and funders have no role in development of their recommendations. American Society of Clinical Oncology (ASCO) * ASCO is a professional oncology society committed to conquering cancer through research, education, prevention and delivery of high-quality patient care. ASCO expert panels identify and develop practice recommendations for specific areas of cancer care that would benefit from using practice guidelines. Association for Molecular Pathology (AMP) AMP is a not-for-profit scientific society that advances the clinical practice, science, and excellence of molecular and genomic laboratory medicine through education, innovation, and advocacy. AMP Clinical Practice Guidelines and Reports are developed to be of assistance to laboratory and other health care professionals. BlueCross BlueShield Technology Evaluation Center (TEC) * BCBS TEC produces systematic reviews of genetic tests. Each TEC Assessment is an evaluation of the evidence for clinical effectiveness and clinical utility of a medical procedure, device, drug or diagnostics. Recent TEC Assessments are available to the public at bcbs.com/TEC. Office of Public Health Genomics (OPHG), Centers for Disease Control and Prevention, OPHG categorizes genomic tests and family health history in practice according to three levels of evidence based on a systematic review of analytic validity, clinical validity and utility for specific clinical scenarios. Clinical Pharmacogenetics Implementation Consortium (CPIC) * CPIC provides guidelines that enable the translation of genetic laboratory test results into actionable prescribing decisions for specific drugs. Guidelines are designed to help clinicians understand HOW available genetic test results should be used to optimize drug therapy, rather than whether tests should be ordered. Evaluation of Genomic Applications in Practice and Prevention (EGAPP) working group * A CDC initiative, EGAPP is a non-regulatory, independent group whose purpose is to conduct evidence-based evaluations of genetic tests and other applications of genomic technology that are available or emerging into clinical and public health practice. Grading of Recommendations Assessment, Development and Evaluation (GRADE) working group The GRADE working group's aim is to develop a common, sensible approach to grading quality of evidence and strength of recommendation. GRADE assesses quality of evidence (confidence of effect estimate – high/moderate/low/very low) and strength of recommendation (confidence that adherence to recommendation will do more good than harm – strong/weak) Dutch Pharmacogenetics Working Group (DPWG) * The DPWG is convened by the Royal Dutch Pharmacists Association and includes clinical pharmacists, physicians, clinical pharmacologists, clinical chemists, epidemiologists, and toxicologists. The objective of the DPWG is to develop pharmacogenetics-based therapeutic (dose) recommendations. The recommendations do not indicate patients who are eligible for genotyping, but merely aim to optimize drug use patients whose genotypes are known. National Comprehensive Cancer Network (NCCN) * NCCN is an alliance of 21 cancer centers for patient care, research, and education and 48 multidisclipinary panels of volunteer experts. Their guidelines span the continuum of cancer care. National Society of Genetic Counselors - Practice Guidelines Committee * NSGC promotes the professional interests of genetic counselors and provides a network for professional communication. NSGC develops practice guidelines to address topics that affect the practice of genetic counseling. UK Genetic Testing Network (UKGTN), NHS UKGTN is an advisory organisation that provides comission support to the National Health Service and Department of Health for patients in the UK. The UKGTN evaluates new genetic tests that member laboratories would like to offer to NHS patients and which fall within the remit of UKGTN test evaluation. * indicates participation in Table 1 survey