This open-access publication in the International Journal of Neonatal Screening discusses the challenges of false positive results, with a disproportionately high number in the premature newborn population for Severe Combined Immunodeficiency (SCID) by measurement of T-cell receptor (TREC). 

Gavigilio, A., Lasarev, M., Sheller, R., Singh, S., and Baker, M. (2023). Newborn screening for severe combined immunodeficiency: Lessons learned from screening and follow-up of preterm newborn population. International Journal of Neonatal Screening, 9(4), 68. https://dio.org/10.3390/ijns9040068