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Birth Prevalence of Disorders Detectable Through Newborn Screening by Race/Ethnicity

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©American College of Medical Genetics and Genomics ORIGINAL RESEARCH ARTICLE Birth prevalence of disorders detectable through newborn screening by race/ethnicity Lisa Feuchtbaum, DrPH, MPH1, Jennifer Carter, MPH2, Sunaina Dowray, MPH2, Robert J. Currier, PhD1 and Fred Lorey, PhD1 Purpose: The purpose of this study was to describe the birth prev- Conclusion: The California newborn screening data offer a alence of genetic disorders among different racial/ethnic groups unique opportunity to explore the birth prevalence of many through population-based newborn screening data. genetic dis orders across a wide spectrum of racial/ethnicity classifications. The data demonstrate that racial/ethnic subgroups Methods: Between 7 July 2005 and 6 July 2010 newborns in Cali- of the California newborn population have very different patterns fornia were screened for selected metabolic, endocrine, hemoglobin, of heritable disease expression. Determining the birth prevalence and cystic fibrosis disorders using a blood sample collected via heel of these disorders in California is a first step to understanding stick. The race and ethnicity of each newborn was self-reported by the short- and long-term medical and treatment needs faced by the mother at the time of specimen collection. affected communities, especially those groups that are impacted by Results: Of 2,282,138 newborns screened, the overall disorder detec- more severe disorders. tion rate was 1 in 500 births. The disorder with the highest prevalence Genet Med 2012:14(11):937–945 among all groups was primary congenital hypothyroidism (1 in 1,706 births). Birth prevalence for specific disorders varied widely among Key Words: birth prevalence; disorders; newborn screening; race different racial/ethnic groups. and ethnicity INTRODUCTION 18 unique racial/ethnic categories on the NBS bloodspot col- State wide newborn screening (NBS) programs provide lection card, which includes nearly all of the proposed racial/ population-based screening for genetic disorders, with addi- ethnic categories described in the recently released guidelines tional follow-up services to ensure that all newborns with posi- by the US Department of Health and Human Services.3 Thus, tive screening test results are referred for confirmatory testing. the California NBS data offers a unique opportunity to explore In the past several years, there has been a successful nationwide the population distribution of the core and secondary disor- effort for states to adopt a Recommended Uniform Screening ders across racial/ethnicity classifications that closely resem- Panel so that all newborns in the United States are screened ble the newly promulgated categories. Determining the birth for a similar set of core conditions.1 The core panel currently prevalence of these disorders is a first step to understanding consists of 31 primary conditions including disorders detect- the short- and long-term disease management needs faced by able using tandem mass spectrometry (MS/MS), endocrine affected communities, especially those groups that are impacted and hemoglobin disorders, cystic fibrosis (CF), and, recently by more severe disorders. These data may also be informative added, severe combined immunodeficiency and critical con- to public health officials in other countries who want to know genital heart defects. Today, almost all states have adopted which disorders impact selected populations. the core panel of NBS disorders, except for severe combined Given the rarity of many of the disorders, it is difficult for indi- immunodeficiency and critical congenital heart defects, which vidual state screening programs to develop statistically signifi- are yet to be widely available. Additional disorders can also be cant comparisons of disorder prevalence rates by specific racial/ identified as part of the differential diagnosis of the core panel, ethnicity groups. Individual states may be too small or may lack but these secondary disorders are not uniformly included by all significant ethnic diversity. Only limited race-specific disorder state programs. The National Newborn Screening & Genetics profiles have been reported elsewhere. Previous research has Resource Center provides up-to-date information about the examined the relationship between ethnicity and a single genetic conditions screened for within the United States.2 disorder, including the prevalence of a mutation or disorder Despite the increase in the number of disorders detected within a specific ethnic group,4–8 within several ethnic groups through NBS programs in the United States, there is a lack of in a region,9–17 or by geographic region only.18,19 No studies have up-to-date knowledge about how often the disorders occur and published the disorder prevalence rates by specific racial/eth- who is affected by them. The California NBS program includes nicity groups in a large US population. California is unique in 1Genetic Disease Screening Program, California Department of Public Health, Richmond, California, USA; 2Public Health Foundation Enterprises, City of Industry, California, USA. Correspondence: Lisa Feuchtbaum ([email protected]) Submitted 17 January 2012; accepted 30 May 2012; advance online publication 5 July 2012. doi:10.1038/gim.2012.76 GENETICS in MEDICINE | Volume 14 | Number 11 | November 2012 937 ORIGINAL RESEARCH ARTICLE FEUCHTBAUM et al | Birth prevalence of NBS disorders by race/ethnicity that it has the largest population of any single state in the United for which screening is required shall report such a diagnosis States with more than 50% of the population identified as part of and the information necessary for follow-up and investigation a minority group.20 to the Public Health Department.24 Thus, this study includes all In July 2005, the NBS panel was expanded to include all of genetic disorders screened and reported in California during the primary and secondary conditions recommended by the the 5-year time frame. Secretary’s Advisory Committee on Heritable Disorders in Information on race/ethnicity of the infants was reported by Newborns and Children.1 A detailed clinical description of all the mother, who was instructed to select all applicable choices of the disorders screened for can be found at the GeneReviews from a selection of 18 distinct racial/ethnicity categories on the website.21 This article provides a comprehensive accounting of NBS test requisition form. To check the extent of misclassifi- all clinical determinations for all newborns with a positive NBS cation bias of race/ethnicity, we linked NBS records with vital test result who were referred for confirmatory testing during statistics birth certificate records for a sample year (2007) and the study period, including those conditions with mild, ques- assessed the level of agreement between the two data sources. tionable, or yet unknown clinical significance. Through the On the basis of this analysis, we collapsed some race catego- NBS long-term follow-up data collection process,22 we hope ries into combination groups (i.e., “Pacific Islander,” “Southeast to learn more about the clinical significance of these and all Asian”) and assigned newborns to 1 of 16 racial/ethnic catego- disorders diagnosed through screening. The birth prevalence ries, which are defined in Table 1. rates of these conditions (hereafter referred to as “disorders”) All positive test results were reported to the California Genetic are reported for specific racial/ethnic groups. Disease Screening Program (GDSP) through a secure computer- based online Screening Information System. Newborns with ini- MATERIALS AND METHODS tial screen-positive results were referred to a state-contracted spe- The cohort described in this study includes all screened new- cialty follow-up center for endocrine, metabolic, hemoglobin,12 borns who were born between 7 July 2005 and 6 July 2010. Blood or CF disorders. Center specialists determined whether referred specimens were collected by heel-stick between 12 h and 6 days children had a disorder through appropriate confirmatory test- after birth, with 96.6% of specimens collected between 12 and ing. Confirmatory algorithms for follow-up of MS/MS disorders 72 h of age. Following collection, all specimens were sent by the were developed by a committee of state metabolic specialists; collecting hospitals to a state-approved laboratory for testing. endocrine, hemoglobin, and CF specialists also meet regularly Screening for metabolic disorders was conducted by measuring to review cases to promote consistency of follow-up protocols acylcarnitines and amino acids by MS/MS; endocrine disorders and case definitions. Final determinations of disease status were (including congenital hypothyroidism(CH) and congenital adre- reported to the GDSP regardless of disorder severity. nal hypoplasia (CAH)) were screened by fluorescent immuno- Newborns who did not meet the guidelines for “typical” CF, assay followed by a second-tier high-performance liquid chro- but who were determined to have an intermediate form of the matography and an tandem mass spectrometry assay for CAH disorder called transmembrane conductance regulator–related using androstenedione, cortisol, and 17-hydroxyprogesterone; metabolic syndrome (CRMS) were included in the list of dis- hemoglobin disorders were screened by high-performance liq- orders. This condition is characterized by a borderline sweat uid chromatography; galactosemia and biotinidase deficiency test result along with the detection of up to two cystic fibro-
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