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ASSAY SYSTEM FOR QUANTIFICATION OF TRACE AMOUNTS OF BIOLOGICAL SUBSTANCES COMPRISING A WORKSTATION WHICH IS COMPRISED OF A FILTRATION MANIFOLD FOR ACCEPTING BIOLOGICAL FLUID SAMPLES, A READER HAVING A SEMICONDUCTOR ELECTRODE, AND A COMPUTER WITH A KEYBOARD AND A PRINTER USED FOR DATA ANALYSIS AND REPORT GENERATION, AND LABORATORY ASSAY SUPPLIES, NAMELY, REAGENTS, STANDARDS, CONTROLS, AND DISPOSABLES, NAMELY PLASTIC STICKS FRAMING A POROUS FILTER MEMBRANE, FILTRATION SAMPLE HOLDERS, AND PLASTIC CLAMPING BLOCKS TO IMMOBILIZE THE FILTER MEMBRANE DURING FILTRATION