Microcoils are integrated with n-well Hall sensors in a complementary metal-oxide-semiconductor (CMOS) integrated circuit for the detection of individual superparamagnetic beads. The 4.2-μm-wide microcoils, generating magnetic fields of 800 μT with 10 mA of current, are used to polarize beads of 2.8 μm in diameter. The resulting 10.8 μT magnetization field induced in the bead is measured by a 4.7 μm Hall sensor, stacked below the microcoil. The detection system has a sensitivity and resolution of 34 V/A T and 300 nT/√Hz, respectively. Integration of the magnetic bead detection onto a CMOS platform drastically reduces system cost, complexity, and power consumption, and marks an important milestone on the road to implementing low-cost, easy-to-use, point-of-care diagnostic assay.