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Congenital anomaly surveillance in England - Ascertainment deficiencies in the national system

Lookup NU author(s): Professor Judith Rankin



Objective: Firstly, to assess the completeness of ascertainment in the National Congenital Anomaly System (NCAS), the basis for congenital anomaly surveillance in England and Wales, and its variation by defect, geographical area, and socioeconomic deprivation. Secondly, to assess the impact of the lack of data on pregnancies terminated because of fetal anomaly. Design: Comparison of the NCAS with four local congenital anomaly registers in England. Setting: Four regions in England covering some 109 000 annual births. Participants: Cases of congenital anomalies registered in the NCAS (live births and stillbirths) and independently registered in the four local registers (live births, stillbirths, fetal losses from 20 weeks' gestation, and pregnancies terminated after prenatal diagnosis of fetal anomaly). Main outcome measure: The ratio of cases identified by the national register to those in local registry files, calculated for different specified anomalies, for whole registry areas, and for hospital catchment areas within registry boundaries. Results: Ascertainment by the NCAS (compared with data from local registers, from which terminations of pregnancy were removed) was 40% (34% for chromosomal anomalies and 42% for non-chromosomal anomalies) and varied markedly by defect, by local register, and by hospital catchment area, but not by area deprivation. When terminations of pregnancy were included in the register data, ascertainment by NCAS was 27% (19% for chromosomal anomalies and 31% for non-chromosomal anomalies), and the geographical variation was of a similar magnitude. Conclusion: The surveillance of congenital anomalies in England is currently inadequate because ascertainment to the national register is low and non-uniform and because no data exist on termination of pregnancy resulting from prenatal diagnosis of fetal anomaly.

Publication metadata

Author(s): Boyd PA, Armstrong B, Dolk H, Botting B, Pattenden S, Abramsky L, Rankin J, Vrijheid M, Wellesley D

Publication type: Article

Publication status: Published

Journal: British Medical Journal

Year: 2005

Volume: 330

Issue: 7481

Pages: 27-31

Print publication date: 01/01/2005

Date deposited: 13/10/2010

ISSN (print): 0959-8138

ISSN (electronic): 1756-1833

Publisher: BMJ Group


DOI: 10.1136/bmj.38300.665301.3A

PubMed id: 15561730


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