Data Resource Profile: Maternity Services Dataset (MSDS)

The Maternity Services Dataset (MSDS) is a comprehensive administrative dataset, capturing detailed information on NHS-funded maternity services in England. It encompasses the full maternity care pathway. There are two versions of the dataset: MSDS V1.5, introduced in May 2015, and the updated MSDS V2.0, which replaced it in April 2019.

MSDS is a secondary-use dataset, repurposing clinical and operational data primarily for monitoring, commissioning, and auditing purposes. Data is submitted monthly by trusts, enabling NHS England to generate a national picture of maternity activity and publish official statistics. Patient identifiers enable linkage with other NHS datasets, such as Hospital Episode Statistics (HES).

The dataset includes demographic, clinical, and organisational information for each pregnant person and their baby, such as appointment dates, diagnoses, delivery details, birthweight, and neonatal admissions. Provider and geographical data are also recorded. Data quality varies due to the classification of variables as mandatory, required, or optional. Most variables are required, meaning submission is expected when applicable, but not enforced, leading to inconsistencies in data completeness across trusts. Only a small number of fields are mandatory, meaning that data must be present for a successful submission.

The MSDS is used for national and local health service planning, including major audits such as the National Maternity and Perinatal Audit. Although it holds potential for research, uptake has been limited to date due to its relative novelty. As coverage improves and the number of available years increases, the MSDS will become an increasingly robust resource for conducting research. It contains a wealth of information from the maternity services pathway - much of which is not available elsewhere - making it a highly valuable dataset for pregnancy-related research. Access to the MSDS is provided by NHS England. Data are requested through the online Data Access Request Service.

MSDS contains data on all NHS funded maternity services in England.There are two versions of MSDS: V1.5 (which runs from May 2015 to March 2019) and V2.0 (which went live in April 2019). While data are available from financial year 2015/2016, there is limited usability until financial year 2018/2019 due to coverage.Detailed demographic, clinical and organisational information is available for each pregnant person (throughout their maternity services pathway) as well as demographic and clinical information for the baby.Data are linkable to other datasets held by NHS England, including Hospital Episode Statistics (HES) Admitted Patient Care (APC), HES A&E, Emergency Care Data Set (ECDS), HES Outpatient, Mental Health Services Data Set (MHSDS) and Community Services Data Set (CSDS).Access to MSDS is provided by NHS England. Data are requested through the online Data Access Request Service.