A cantilever array can be positioned adjacent a surface in the presence of a sample. The cantilever array includes a plurality of cantilevers having one member of a specific binding pair thereon. The surface includes the other member of a specific binding pair. Binding between the members of the binding pair on the cantilevers and the surface can be detected. The presence, absence and/or concentration of a member of the specific binding pair in the sample can be detected based on the detected binding between the specific binding pair member on the cantilevers and the specific binding pair member on the surface.