Asymmetric sandwich membrane system as diagnostic test device.

摘要

Disclosed is a diagnostic test device which comprises a fluid permeable structural support member having a macroporous membrane, i.e., having pores greater than 0.2 mu in diameter on one side thereof and a microporous membrane, i e., having pores less than 0.2 mu in diameter on the other side. The device is structured so as to allow the free flow of fluid applied to the macroporous membrane through to the microporous membrane. The device is designed to facilitate the inclusion of incompatible reagents in a single test device.