NHS & National ID Tools

Checksum validation and synthetic test identifier generation for NHS (England & Wales) and Scottish CHI numbers.

NHS Number (England & Wales)

Modulus 11

Validate Existing NHS Number

Generate Valid Synthetic Test Number

Generated identifiers are strictly synthetic and mathematically verified for testing and validation environments.

Scottish CHI Number

DDMMYYGGGC

Validate Existing CHI Number

Generate Test CHI Number

Date of Birth

Assigned Gender

CHI numbers encode birthdate (DDMMYY) and gender within digits 7–9 alongside the check digit.

Disclaimer: This toolkit is intended to support trained laboratory professionals. It provides calculation and decision-support functions and should be used in conjunction with local SOPs, validated laboratory procedures and current national guidelines. Final clinical interpretation remains the responsibility of the reporting laboratory.