Falsely Decreased Human Chorionic Gonadotropin (hCG) Results Due to Increased Concentrations of the Free {beta} Subunit and the {beta} Core Fragment in Quantitative hCG Assays

D. G Grenache, D. N Greene, A. S Dighe, C. R Fantz, D Hoefner, C McCudden, L Sokoll, C. L Wiley and A. M. Gronowski

Clinical Chemistry 56 ( 12 ): 1839 - 1844 , 2010