A Sonoclot Coagulation & Platelet Function Analyzer was used to determine the neutralization of C. atrox venom effects on ACT, CR, and PF by Wyeth and Antivipmyn expired antivenoms. Black bars: NSS 0.85% NaCl, Dark grey bars: venom controls (venom+NaCl), Medium grey bars: venom/antivenom samples, and Light grey bars: antivenom controls (antivenom+NaCl). NSS: normal control, Ca: C. atrox venom, Wy: Wyeth antivenom, and AV: Antivipmyn antivenom. ** Indicates significant differences between the venom controls and the venom/antivenom samples.