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Belaramani, Kiran Moti; Chan, Toby Chun Hei; Hau, Edgar Wai Lok; Yeung, Matthew Chun Wing; Kwok, Anne Mei Kwun; Lo, Ivan Fai Man; Law, Terry Hiu Fung; Wu, Helen; Wong, Sheila Suet Na; Lam, Shirley Wai; Ha, Gladys Ha Yin; Lau, Toby Pui Yee; Wong, Tsz Ki; Or, Venus Wai Ching; Wong, Rosanna Ming Sum; Ming, Wong Lap; Chow, Jasmine Chi Kwan; Yau, Eric Kin Cheong; Fu, Antony; Chong, Josephine Shuk Ching; Yau, Ho Chung; Poon, Grace Wing Kit; Ng, Kwok Leung; Chan, Kwong Tat; Lam, Yuen Yu; Hui, Joannie; Mak, Chloe Miu; Fung, Cheuk Wing
International journal of neonatal screening, 03/2024, Volume: 10, Issue: 1Journal Article
Newborn screening (NBS) is an important public health program that aims to identify pre-symptomatic healthy babies that will develop significant disease if left undiagnosed and untreated. The number of conditions being screened globally is expanding rapidly in parallel with advances in technology, diagnosis, and treatment availability for these conditions. In Hong Kong, NBS for inborn errors of metabolism (NBSIEM) began as a pilot program in October 2015 and was implemented to all birthing hospitals within the public healthcare system in phases, with completion in October 2020. The number of conditions screened for increased from 21 to 24 in April 2016 and then to 26 in October 2019. The overall recruitment rate of the NBS program was 99.5%. In the period between October 2015 and December 2022, 125,688 newborns were screened and 295 were referred back for abnormal results. The recall rate was reduced from 0.26% to 0.12% after the implementation of second-tier testing. An inherited metabolic disorder (IMD) was eventually confirmed in 47 infants, making the prevalence of IMD in Hong Kong 1 in 2674. At the time of the NBS result, 78.7% of the newborns with IMD were asymptomatic. There were two deaths reported: one newborn with methylmalonic acidemia cobalamin B type (MMACblB) died after the initial crisis and another case of carnitine palmitoyltransferase II deficiency (CPTII) died at 18 months of age after metabolic decompensation. The most common IMD noted were disorders of fatty acid oxidation metabolism (40%, 19 cases), closely followed by disorders of amino acid metabolism (38%, 18 cases), with carnitine uptake defect (19.1%, 9 cases) and citrullinemia type II (17%, 8 cases) being the two most common IMD picked up by the NBSIEM in Hong Kong. Out of the all the IMDs identified, 19.1% belonged to diverse ethnic groups. False negative cases were reported for citrullinemia type II and congenital adrenal hyperplasia during this period.
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