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Bath Indices

What are The Bath Indices?

The Bath Indices is a set of measurements used to aid diagnosis and monitor disease activity in people with axial SpA (AS).

These are a mix of physical measurements and patient reported outcome measures (PROMs) developed by researchers in partnership with patients at the Royal National Hospital for Rheumatic Diseases. They are widely regarded as the most effective measurements for the condition.

Find out more

This booklet helps to explain each of these type of measurements and how to use them correctly. It provides a synopsis of the Bath AS Metrology Index (BASMI), the Bath AS Functional Index (BASFI), the Bath AS Disease Activity Index (BASDAI) and the Bath AS Patient Global Score (BAS-G).

You can also watch this video produced by Liz Van Rossen MCSP, Extended Scope Practitioner in Rheumatology Physiotherapy.