International Journal of Neonatal Screening

15 pages, 1371 KiB

Open AccessSystematic Review

Refining CFTR-Related Metabolic Syndrome (CRMS)/Cystic Fibrosis Screen Positive, Inconclusive Diagnosis (CFSPID) Diagnosis: Impact of CFTR2 Variant Classifications

by MacKenzie Wyatt, Alexandra Quinn, Lincoln Shade and Meghan McGarry

Int. J. Neonatal Screen. 2025, 11(3), 60; https://doi.org/10.3390/ijns11030060 - 30 Jul 2025

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Abstract

An unintended consequence of cystic fibrosis (CF) newborn screening (NBS) is the identification of infants with a positive NBS who do not meet the diagnostic criteria for CF (two CF-causing variants and/or sweat chloride > 60 mmol/L). This indeterminate diagnosis is called cystic [...] Read more.

An unintended consequence of cystic fibrosis (CF) newborn screening (NBS) is the identification of infants with a positive NBS who do not meet the diagnostic criteria for CF (two CF-causing variants and/or sweat chloride > 60 mmol/L). This indeterminate diagnosis is called cystic fibrosis transmembrane conductance regulator (CFTR)-related metabolic syndrome (CRMS) or CF screen positive, inconclusive diagnosis (CFSPID). CRMS/CFSPID occurs when it is not clearly known whether CFTR variants are disease-causing. In 2024, the CFTR2 classification of many CFTR variants was changed from unknown significance to either CF-causing variants or variants of varying clinical consequences (VVCCs). We conducted a meta-analysis of CRMS/CFSPID cases from manuscripts to describe how the diagnoses would change using two different variant panels: (1) only CF-causing CFTR variants (Panel_CF-causing) and (2) CF-causing variants and VVCCs (Panel_{CF-causing+VVCCs}). Using the Panel_CF-causing, 8.7% had two CF-causing variants (reclassified as CF), while 91.3% had less than two CF-causing variants (reclassified as Undetected). Using the Panel_{CF-causing+VVCCs}, 51.4% had either two VVCCs or one VVCC with one CF-causing variant detected (reclassified as CRMS/CFSPD), 39.9% had less than two CF-causing variants detected (reclassified as Undetected), and 8.7% had two CF-causing variants (reclassified as CF). In conclusion, using the updated CFTR2 classification of CFTR variants significantly decreases the number of children with CRMS/CFSPID and gives a definitive diagnosis of CF to some children while not detecting as many children who are unlikely to develop CF. Full article

(This article belongs to the Special Issue Advances in Cystic Fibrosis Newborn Screening: From Laboratory Testing to Diagnosis)

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14 pages, 882 KiB

Open AccessArticle

Advancing Neonatal Screening for Pyridoxine-Dependent Epilepsy-ALDH7A1 Through Combined Analysis of 2-OPP, 6-Oxo-Pipecolate and Pipecolate in a Butylated FIA-MS/MS Workflow

by Mylène Donge, Sandrine Marie, Amandine Pochet, Lionel Marcelis, Geraldine Luis, François Boemer, Clément Prouteau, Samir Mesli, Matthias Cuykx, Thao Nguyen-Khoa, David Guénet, Aurélie Empain, Magalie Barth, Benjamin Dauriat, Cécile Laroche-Raynaud, Corinne De Laet, Patrick Verloo, An I. Jonckheere, Manuel Schiff, Marie-Cécile Nassogne and Joseph P. Dewulf Show full author list Hide full author list

Int. J. Neonatal Screen. 2025, 11(3), 59; https://doi.org/10.3390/ijns11030059 - 30 Jul 2025

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Abstract

Pyridoxine-dependent epilepsy (PDE) represents a group of rare developmental and epileptic encephalopathies. The most common PDE is caused by biallelic pathogenic variants in ALDH7A1 (PDE-ALDH7A1; OMIM #266100), which encodes α-aminoadipate semialdehyde (α-AASA) dehydrogenase, a key enzyme in lysine catabolism. Affected individuals present with [...] Read more.

Pyridoxine-dependent epilepsy (PDE) represents a group of rare developmental and epileptic encephalopathies. The most common PDE is caused by biallelic pathogenic variants in ALDH7A1 (PDE-ALDH7A1; OMIM #266100), which encodes α-aminoadipate semialdehyde (α-AASA) dehydrogenase, a key enzyme in lysine catabolism. Affected individuals present with seizures unresponsive to conventional anticonvulsant medications but responsive to high-dose of pyridoxine (vitamin B6). Adjunctive lysine restriction and arginine supplementation have also shown potential in improving neurodevelopmental outcomes. Given the significant benefit of early intervention, PDE-ALDH7A1 is a strong candidate for newborn screening (NBS). However, traditional biomarkers are biochemically unstable at room temperature (α-AASA and piperideine-6-carboxylate) or lack sufficient specificity (pipecolate), limiting their utility for biomarker-based NBS. The recent identification of two novel and stable biomarkers, 2S,6S-/2S,6R-oxopropylpiperidine-2-carboxylate (2-OPP) and 6-oxo-pipecolate (oxo-PIP), offers renewed potential for biochemical NBS. We evaluated the feasibility of incorporating 2-OPP, oxo-PIP, and pipecolate into routine butylated FIA-MS/MS workflows used for biochemical NBS. A total of 9402 dried blood spots (DBS), including nine confirmed PDE-ALDH7A1 patients and 9393 anonymized controls were analyzed using a single multiplex assay. 2-OPP emerged as the most sensitive biomarker, identifying all PDE-ALDH7A1 patients with 100% sensitivity and a positive predictive value (PPV) of 18.4% using a threshold above the 99.5th percentile. Combining elevated 2-OPP (above the 99.5th percentile) with either pipecolate or oxo-PIP (above the 85.0th percentile) as secondary marker detected within the same multiplex FIA-MS/MS assay further improved the PPVs to 60% and 45%, respectively, while maintaining compatibility with butanol-derivatized method. Notably, increasing the 2-OPP threshold above the 99.89th percentile, in combination with either pipecolate or oxo-PIP above the 85.0th percentile resulted in both 100% sensitivity and 100% PPV. This study supports the strong potential of 2-OPP-based neonatal screening for PDE-ALDH7A1 within existing NBS infrastructures. The ability to multiplex 2-OPP, pipecolate and oxo-PIP within a single assay offers a robust, practical, high-throughput and cost-effective approach. These results support the inclusion of PDE-ALDH7A1 in existing biochemical NBS panels. Further prospective studies in larger cohorts are needed to refine cutoffs and confirm clinical performance. Full article

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10 pages, 1202 KiB

Open AccessArticle

Incidence of Congenital Hypothyroidism Is Increasing in Chile

by Francisca Grob, Gabriel Cavada, Gabriel Lobo, Susana Valdebenito, Maria Virginia Perez and Gilda Donoso

Int. J. Neonatal Screen. 2025, 11(3), 58; https://doi.org/10.3390/ijns11030058 - 26 Jul 2025

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Abstract

Congenital hypothyroidism (CH) is a leading preventable cause of neurocognitive impairment. Its incidence appears to be rising in several countries. We analysed 27 years of newborn-screening data (1997–2023) from the largest Chilean screening centre, covering 3,225,216 newborns (51.1% of national births), to characterise [...] Read more.

Congenital hypothyroidism (CH) is a leading preventable cause of neurocognitive impairment. Its incidence appears to be rising in several countries. We analysed 27 years of newborn-screening data (1997–2023) from the largest Chilean screening centre, covering 3,225,216 newborns (51.1% of national births), to characterise temporal trends and potential drivers of CH incidence. Annual CH incidence was modelled with Prais–Winsten regression to correct for first-order autocorrelation; additional models assessed trends in gestational age, sex, biochemical markers, and aetiological subtypes. We identified 1550 CH cases, giving a mean incidence of 4.9 per 10,000 live births and a significant yearly increase of 0.067 per 10,000 (95 % CI 0.037–0.098; p < 0.001). Mild cases (confirmation TSH < 20 mU/L) rose (+0.89 percentage points per year; p = 0.002). The program’s recall was low (0.05%). Over time, screening and diagnostic TSH values declined, total and free T4 concentrations rose, gestational age at diagnosis fell, and a shift from thyroid ectopy toward hypoplasia emerged; no regional differences were detected. The sustained increase in CH incidence, alongside falling TSH thresholds and growing detection of in situ glands, suggests enhanced recognition of milder disease. Ongoing surveillance should integrate environmental, iodine-nutrition, and genetic factors to clarify the causes of this trend. Full article

(This article belongs to the Special Issue Newborn Screening for Congenital Hypothyroidism)

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2 pages, 173 KiB

Open AccessCorrection

Correction: Berardo et al. Expanded Newborn Screening in Italy: The First Report of Lombardy Region. Int. J. Neonatal Screen. 2025, 11, 31

by Clarissa Berardo, Alessandra Vasco, Alessia Mauri, Simona Lucchi, Laura Cappelletti, Laura Saielli, Manuela Rizzetto, Davide Biganzoli, Cristina Montrasio, Diana Postorivo, Michela Perrone Donnorso, Elisa Pratiffi, Andrea Meta, Stephana Carelli, Alessandro Amorosi, Sabrina Paci, Graziella Cefalo, Francesca Furlan, Francesca Menni, Serena Gasperini, Viola Crescitelli, Giuseppe Banderali, Gianvincenzo Zuccotti, Luisella Alberti and Cristina Cereda Show full author list Hide full author list

Int. J. Neonatal Screen. 2025, 11(3), 57; https://doi.org/10.3390/ijns11030057 - 22 Jul 2025

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Addition of an author [...] Full article

16 pages, 593 KiB

Open AccessArticle

Historical Appreciation of World Health Organization’s Public Health Paper-34: Principles and Practice of Screening for Disease, by Max Wilson and Gunnar Jungner

by Peter C. J. I. Schielen

Int. J. Neonatal Screen. 2025, 11(3), 56; https://doi.org/10.3390/ijns11030056 - 21 Jul 2025

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Abstract

Biographies of Max Wilson and Gunnar Jungner were published in 2017 and 2020. An in-depth appreciation of the Wilson and Jungner principles, and the publication they were presented in, ‘Principles and Practice of Screening for Disease’, published as nr. 34 in the Public [...] Read more.

Biographies of Max Wilson and Gunnar Jungner were published in 2017 and 2020. An in-depth appreciation of the Wilson and Jungner principles, and the publication they were presented in, ‘Principles and Practice of Screening for Disease’, published as nr. 34 in the Public Health Paper-series of the World Health Organisation (W.H.O), called PHP-34 hereafter, was not published as yet. Here an analysis is given of PHP-34 and the ten screening principles, focusing on three subjects. First, by careful analysis of PHP-34, the literature published in the peer reviewed scientific literature, and other sources, the historical background and origin of the ten principles is determined. Second, the precise composition of PHP-34 is described, as parts of the monograph were derived from other seminal works published between roughly 1950 and 1965. Third, it is determined what the contributions of both authors of the monograph were. Results together are discussed in relation to the time PHP-34 was conceptualized and the importance of PHP-34 and the ten principles in the current era. Results show that in the 15 years preceding the publication of PHP-34, many principles of screening were published by authors in the United States of America, a selection of which ended up in PHP-34. Secondly, about 33% of the 145 pages of PHP-34 are drawn from other publications and studies on screening. Thirdly, the case can be made that the actual writing of PHP-34 was done (almost) entirely by Wilson. Regardless, Wilson and Jungner to this day should be applauded for their work. It is a testimony to the value of PHP-34 that we are still reflecting upon, discussing and seeking to intelligently apply the screening principles almost 60 years after their original publication. Full article

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12 pages, 245 KiB

Open AccessArticle

Implementation of Neonatal Screening Program for Congenital Hypothyroidism in Eastern Morocco

by Fatima Wahoud, Samia Essadki, Khadija Zirar, Rajae Lamsyah, Wissam Hajjaji and Rim Amrani

Int. J. Neonatal Screen. 2025, 11(3), 55; https://doi.org/10.3390/ijns11030055 - 17 Jul 2025

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Abstract

Congenital hypothyroidism (CH) is one of the major preventable causes of intellectual disability. This study evaluates the incidence of CH through a newborn screening (NBS) program in eastern Morocco. A descriptive cross-sectional design was used and heel prick blood samples were collected on [...] Read more.

Congenital hypothyroidism (CH) is one of the major preventable causes of intellectual disability. This study evaluates the incidence of CH through a newborn screening (NBS) program in eastern Morocco. A descriptive cross-sectional design was used and heel prick blood samples were collected on blotting paper to measure Thyroid-Stimulating Hormone (TSH) using an immunofluorimetric assay. 4062 newborns were screened (51.3% male, 48.7% female). TSH levels significantly varied by age: newborns sampled before 24 h had a higher median TSH (3.7 µU/mL [0.10–28.90]) compared to those sampled at 24 h or more (2.1 µU/mL [0.10–32.30]; p < 0.001). Using age-specific cut-off values, 18 suspected CH cases were recalled (recall rate: 0.44%). Among the 16 cases who completed confirmatory testing, 4 had transient hyperthyrotropinemia (HTT), characterized by mildly abnormal serum TSH and T4 levels that normalized spontaneously after few months without treatment. Three cases were diagnosed with CH confirmed at birth with markedly elevated serum TSH concentrations and significantly reduced T4 levels. Consequently, the birth prevalence of CH confirmed at birth was 1:1354 live births. The median preanalytical delay was 6 days (IQR: 3–12) and the TSH result turnaround was 8 days (IQR: 5–15), potentially affecting timely intervention. This first report from eastern Morocco confirms the relevance of neonatal screening but highlights delays that must be addressed to enhance early diagnosis and management. Full article

(This article belongs to the Special Issue Newborn Screening for Congenital Hypothyroidism)

6 pages, 645 KiB

Open AccessBrief Report

Neonatology Providers Need Education About Cystic Fibrosis Newborn Screening Algorithms

by Nilesh Seshadri, Lori Christ, David Munson, Andrew Borowiec, Clement L. Ren and Ambika Shenoy

Int. J. Neonatal Screen. 2025, 11(3), 54; https://doi.org/10.3390/ijns11030054 - 17 Jul 2025

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Abstract

An essential link in the cystic fibrosis (CF) newborn screening (NBS) process is communication of results. While this is described between NBS programs and primary care providers, data of this occurrence is limited with neonatologists. Neonatology providers represent a group caring for critically [...] Read more.

An essential link in the cystic fibrosis (CF) newborn screening (NBS) process is communication of results. While this is described between NBS programs and primary care providers, data of this occurrence is limited with neonatologists. Neonatology providers represent a group caring for critically ill infants with conditions that can impact their ability to complete diagnostic testing after an abnormal NBS. Delays in testing can prolong time to diagnosis. We fielded a survey to assess neonatology provider knowledge and awareness of the Pennsylvania state CF NBS algorithm after an update occurred. Provider demographics, awareness of CF NBS update, and knowledge of the diagnostic testing process were measured. 86% of respondents were unaware of Pennsylvania CF NBS updates. Provider comfort with interpreting CF NBS results varied. 40% of providers identified the next diagnostic testing steps for a critically ill infant following an abnormal CF NBS. Our survey emphasizes the need for educating neonatology providers about CF NBS to improve knowledge and awareness of CF NBS algorithms to facilitate the early diagnosis of affected infants. Full article

(This article belongs to the Special Issue Advances in Cystic Fibrosis Newborn Screening: From Laboratory Testing to Diagnosis)

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16 pages, 860 KiB

Open AccessArticle

Cost–Effectiveness of Newborn Screening for X-Linked Adrenoleukodystrophy in the Netherlands: A Health-Economic Modelling Study

by Rosalie C. Martens, Hana M. Broulikova, Marc Engelen, Stephan Kemp, Anita Boelen, Robert de Jonge, Judith E. Bosmans and Annemieke C. Heijboer

Int. J. Neonatal Screen. 2025, 11(3), 53; https://doi.org/10.3390/ijns11030053 - 16 Jul 2025

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Abstract

X-linked adrenoleukodystrophy (ALD) is an inherited metabolic disorder that can cause adrenal insufficiency and cerebral ALD (cALD) in childhood. Early detection prevents adverse health outcomes and can be achieved by newborn screening (NBS) followed by monitoring disease progression. However, monitoring is associated with [...] Read more.

X-linked adrenoleukodystrophy (ALD) is an inherited metabolic disorder that can cause adrenal insufficiency and cerebral ALD (cALD) in childhood. Early detection prevents adverse health outcomes and can be achieved by newborn screening (NBS) followed by monitoring disease progression. However, monitoring is associated with high costs. This study evaluates the cost–effectiveness of NBS for ALD in The Netherlands compared to no screening using a health economic model. A decision tree combined with a Markov model was developed to estimate societal costs, including screening costs, healthcare costs, and productivity losses of parents, and health outcomes over an 18-year time horizon. Model parameters were derived from the literature and expert opinion. A probabilistic sensitivity analysis (PSA) was performed to assess uncertainty. The screening costs of detecting one ALD case by NBS was EUR 40,630. Until the age of 18 years, the total societal cost per ALD case was EUR 120,779 for screening and EUR 62,914 for no screening. Screening gained an average of 1.7 QALYs compared with no screening. This resulted in an incremental cost–effectiveness ratio (ICER) of EUR 34,084 per QALY gained for screening compared to no screening. Although the results are sensitive to uncertainty surrounding costs and effectiveness due to limited data, NBS for ALD is likely to be cost–effective using a willingness-to-pay (WTP) threshold of EUR 50,000– EUR 80,000 per QALY gained. Full article

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10 pages, 1024 KiB

Open AccessArticle

The Promising Role of Intestinal Organoids in the Diagnostic Work-Up of Cystic Fibrosis Screen Positive Inconclusive Diagnosis/CFTR-Related Metabolic Syndrome (CFSPID/CRMS)

by Noelia Rodriguez Mier, Marlies Destoop, Sacha Spelier, Anabela Santo Ramalho, Jeffrey M. Beekman, François Vermeulen, Karin M. de Winter-de Groot and Marijke Proesmans

Int. J. Neonatal Screen. 2025, 11(3), 52; https://doi.org/10.3390/ijns11030052 - 11 Jul 2025

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Abstract

Cystic Fibrosis Screen Positive Inconclusive Diagnosis/CFTR-related Metabolic Syndrome (CFSPID/CRMS) presents a significant clinical challenge due to its variable diagnostic outcomes and uncertain disease progression. Current diagnostic strategies, including sweat chloride testing and genetic analysis fall short in delivering clear guidance for clinical decision-making [...] Read more.

Cystic Fibrosis Screen Positive Inconclusive Diagnosis/CFTR-related Metabolic Syndrome (CFSPID/CRMS) presents a significant clinical challenge due to its variable diagnostic outcomes and uncertain disease progression. Current diagnostic strategies, including sweat chloride testing and genetic analysis fall short in delivering clear guidance for clinical decision-making and risk assessment. Here, we comment on the potential of CFTR functional tests in patient-derived intestinal organoids (PDIOs) to enhance early risk stratification in CFSPID/CRMS cases. Using four hypothetical cases based on real-world data, we illustrate diverse clinical trajectories: diagnosis of cystic fibrosis (CF), reclassification as a CFTR-related disorder (CFTR-RD), non-CF designation, and persistent diagnostic uncertainty. Organoid-based assays—such as forskolin-induced swelling (FIS), steady-state lumen area (SLA) analysis, and rectal organoid morphology analysis (ROMA)—offer functional insights into CFTR activity and drug responsiveness. Compared to existing CFTR functional tests, such as Intestinal Current Measurement (ICM) and Nasal Potential Difference (NPD), these assays are more accessible, highly reproducible, and when needed support personalized medicine approaches. PDIO-based assays could help identify infants at high risk of disease progression, facilitating earlier interventions while minimizing unnecessary follow-ups for those unlikely to develop CF-related symptoms. Although not yet widely implemented, these assays hold promise for refining CFSPID diagnostics and management. Future research should focus on establishing standardized protocols allowing validation of clinical utility. Full article

(This article belongs to the Special Issue Advances in Cystic Fibrosis Newborn Screening: From Laboratory Testing to Diagnosis)

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12 pages, 1564 KiB

Open AccessArticle

Training Primary Healthcare Professionals for Expanded Newborn Screening with Tandem Mass Spectrometry: Challenges for Community Genetics in Brazil

by Luzivan Costa Reis, Tassia Tonon, Marina Bernardes Acosta, Simone Martins de Castro, Vivian de Lima Spode Coutinho, Débora Gusmão Melo and Ida Vanessa Doederlein Schwartz

Int. J. Neonatal Screen. 2025, 11(3), 51; https://doi.org/10.3390/ijns11030051 - 30 Jun 2025

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Abstract

In Brazil, dried blood spots (DBSs) for newborn screening (NBS) should be collected between the 3rd and 5th days of life at local Basic Health Units (BHUs). This study reports the experience of face-to-face training at BHUs in southern Brazil during a pilot [...] Read more.

In Brazil, dried blood spots (DBSs) for newborn screening (NBS) should be collected between the 3rd and 5th days of life at local Basic Health Units (BHUs). This study reports the experience of face-to-face training at BHUs in southern Brazil during a pilot study for tandem mass spectrometry (MS/MS) inclusion in the NBS program. The pilot project involved screening for 22 inborn errors of metabolism (IEMs). The professionals at the BHUs were instructed to carry out the following: (a) explain the study to parents or guardians; (b) collect additional DBS samples on a different collection card (research card); and (c) deliver results to families. In-person visits were conducted at all 137 BHUs. These visits included an overview of the pilot project and distribution of educational materials, including a list of the 22 IEMs and informational leaflets on MS/MS-based NBS. Among the 486 healthcare professionals who participated, 91.2% were women. Overall, 97.1% of the BHUs reported being satisfied with the project. Questions regarding IEMs were raised in 40.1% of BHUs, and 13.1% reported complaints about the research card due to its lighter texture and drying difficulty. Training primary healthcare professionals in IEMs remains an urgent priority in Brazil, particularly in the context of expanded NBS using MS/MS, since they are the frontline professionals in the NBS program. Full article

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18 pages, 5349 KiB

Open AccessArticle

Qatar’s National Expanded Metabolic Newborn Screening Program: Incidence and Outcomes

by Tala Jamaleddin, Karen El-Akouri, Sumaya Abiib, Rola Mitri, Mamatha Ramaswamy, Sara Musa, Rehab Ali, Noora Shahbeck, Hilal Al Rifai, Ghassan Abdoh, Tawfeg Ben-Omran, Osama Y. Al-Dirbashi and Mashael Al-Shafai

Int. J. Neonatal Screen. 2025, 11(3), 50; https://doi.org/10.3390/ijns11030050 - 30 Jun 2025

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Abstract

Background: Newborn screening is an essential public health strategy that aims to detect a range of conditions, including inborn errors of metabolism, in neonates shortly after birth. The timely identification is crucial due to the asymptomatic nature of many conditions at birth, but [...] Read more.

Background: Newborn screening is an essential public health strategy that aims to detect a range of conditions, including inborn errors of metabolism, in neonates shortly after birth. The timely identification is crucial due to the asymptomatic nature of many conditions at birth, but which can lead to significant health complications if left untreated. Through this study, we aimed to investigate the incidence of IEMs screened by the Qatar National Newborn Screening Program. Methods: We retrospectively analyzed a total of 351,223 newborns screened from 2010 to 2023. The incidence for the studied IEMs was calculated and correlated with demographics, consanguinity, and family history. In addition, the diagnostic yield of different tests utilized was assessed. Results: Our study revealed a total of 318 positive cases with IEMs, and a significantly high incidence of 1:1105 for IEMs in Qatar. Classical Homocystinuria was the most frequently detected condition, with a cumulative incidence of 1:6754 live births, linked to the founder variant p. Arg336Cys in the CBS gene. Aminoacidopathies were the most prevalent category, followed by fatty acid oxidation disorders, organic acidurias, biotinidase deficiency, and urea cycle disorders. Genetic testing showed a high diagnostic yield of 90%. Of the 60 cases that underwent targeted variant testing, 98% were confirmed, while 90% of the 59 cases tested by single gene testing were confirmed. Conclusions: Our study provides the incidence rates of IEMs in Qatar and novel insights that could facilitate setting up/developing IEM incidence-reducing strategies and improving outcomes for affected newborns and their families. Full article

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3 pages, 165 KiB

Open AccessCorrection

Correction: Hall et al. Oral and Poster Abstracts of the 13th ISNS European Regional Meeting. Int. J. Neonatal Screen. 2025, 11, 21

by Kate Hall, Peter C. J. I. Schielen and Dimitris Platis

Int. J. Neonatal Screen. 2025, 11(3), 49; https://doi.org/10.3390/ijns11030049 - 24 Jun 2025

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The authors wish to make the following correction to their paper published in the International Journal of Neonatal Screening [...] Full article

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Int. J. Neonatal Screen., Volume 11, Issue 3 (September 2025) – 12 articles

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