Registers that predate the advent of the National Health Service in 1948 are grouped into runs of separately maintained civil (ADA-01 and ADA-02) and medical registers (ADA-03 to ADA-07 inclusive). Between 1907 and 1948, medical registers (those that contained diagnostic information concerning patients) and civil registers (those that did not) were kept separate by Lunacy Commission rules isued on 31 October 1906.

ADC  Certified patient admission and discharge register 1931 - 1948

ARA  General admission registers 1683 - 1973

AIB  Patient admission indexes 1910 - c. 1993

DDR  Patient discharge, transfer and/or death registers and lists 1782 - 1991

ADB  Temporary patient admission and discharge register 1931 - 1947

ADD  Voluntary patient admission and discharge registers 1931 - 1948

05  Registers: admission and discharge