Patent ID: 7572593

Claim:
A test cell, consisting of a magnetically permeable resin material and a plastic film laminated on at least one face of the magnetically permeable resin material, wherein the magnetically permeable resin material comprises a concave portion member and a bottom surface member formed in the concave portion, wherein the magnetically permeable resin material and the plastic film have 30 ppb or less of magnetic metal content, wherein the magnetically permeable resin material and the plastic film have a quantity of total residual magnetism of 15 pT or less under a magnetic field of 0.1 T at a distance between the sample and a SQUID (superconducting quantum interference device) sensor of 1.5 mm, and wherein magnetic signals generated from an immunoreaction assay sample deposited on one surface of the test cell are detectable from the other surface of the test cell by using the SQUID sensor after removal of the plastic film, wherein the magnetically permeable resin material is poly(methyl methacrylate).