Forward and reverse protein arrays are used in many multiparameter clinical diagnostic tests. The multiplicity of protein spots (in picoliter range), displayed in an intricate pattern on the slide surface, allow looking at various interactions simultaneously. The UniSart 3D slide is a special glass slide that is coated with a thin microporous nitrocellulose membrane. The pad on the slide is a three-dimensional microporous nitrocellulose membrane, which shows high protein affinity and binding capacity in all microarray applications.