A DIAGNOSTIC SYSTEM

In some embodiments a diagnostic system is disclosed including a test device for performing diagnostic analysis of a biological sample from a human or animal body, the test device having an assay and a reader to analyse the sample and determine one or more biological conditions and to generate a result data signal containing information on the determination of the one or more biological conditions. The system also comprises a base device to releasably receive the test device, receive the result data signal from the test device, and display results of testing based on the received result data signal. In some embodiments a fluid receptacle is configured to be releasably retained to a test device, the test device comprising a housing, the housing having an engagement element for releasably retaining the fluid receptacle on an outer surface of the housing.