The StarWell Immuno Module design features the precise placement of eight fins on the inner wall of a C bottom well. The inside well bottom is a modified C design, which better facilitates washing and coating. The deliberate orientation of the eight fins ensures compatibility with most MicroWell plate instrumentation and aspiration systems. The addition of the eight fins inside the well increases the surface area by 50%. This increase in surface area allows more molecules to be immobilized, increasing assay signal. The fin configuration provides shorter diffusion distance to the surface, reducing incubation times. Another performance enhancement obtained from the StarWell Module design is the increase of liquid column height due to the displacement of the liquid by the Star fins. More light is absorbed in the higher liquid column, resulting in a higher O.D. reading. The standard 1 x 8 format and the choice of two surface treatments---PolySorp or MaxiSorp---provides assay design flexibility and conservation of coating materials.