Fig. 10. Spectrophotometric curve (Liley method) of amniotic fluid grossly contaminated with blood. Note sharp peaks at 580, 540, and 415 nm, which obscure the 450-nm rise. (Bowman JM: Hemolytic Disease of the Newborn. In Conn RB [ed]: Current Diagnosis 5, p 1107. Philadelphia, WB Saunders, 1977)