The present invention discloses systems and methods for minimizing or eliminating steps in immunosorbent assays for single and multiple analytes by eliminating both the need to attach target molecules to the test well and the need to remove unbound antibodies through rinsing. The immunosorbent assay (ISA) is utilized for a single analyte or target and includes the step of mixing the immunologic molecules with the sample and detection. The present invention further discloses an immunosorbent assay for multiple analytes (ISAMA) for testing a plurality of analytes or targets in a single well using a modified ISA test wherein different tags are attached to different antibody pairs. Alternate embodiments use multiple types of scavenger antigens with corresponding elimination of the need for scavenger antibodies. The present invention discloses various types of test wells for the rapid and simultaneous testing of fluids for a plurality of components and a methodology for a continuous immunosorbent assay. Also disclosed is a method for immunosorbent assay of micro-organisms to determine serotype.