The present invention provides adiagnostic kit for detecting the presence or quantity of one or more test analytes within a test sampletaken from a body surface of a mammal, the diagnostic kit comprising:a separate insert for a lateral flow device (200, 411) comprising a membrane (201) fixed to a rigid support (202) and, the separate insert being configured to obtain the test sample； a lateralflow assay device configured (300, 400) to accept the separate insert (200, 411)； a securing member (210) configured to releasably attach (211) the separate insert to a body surface of a mammal (213)； wherein the securing member (210) comprise an expandable layer (212) configured to apply pressure to the separate insert (200, 411) thereby pressing the separate insert (200, 411) against the body surface of the mammal (213).
