TCO2 levels in blood

The Horseracing Integrity and Welfare Unit (HIWU) has granted a temporary stay of enforcement to connections in six pending total carbon dioxide (TCO2) cases, all of which are out of Pennsylvania. In total, 11 of the 14 pending and resolved TCO2-related cases reported since the advent of the Horseracing Integrity and Safety Act (HISA) have concerned horses that ran in Pennsylvania. Of the three other TCO2-related cases, one ran in California and two were out of Ohio. When asked about the reason behind the temporary stay of enforcement, HIWU spokesperson...

All samples collected from 2021 Breeders' Cup horses have been cleared by the Kenneth L. Maddy Equine Analytical Chemistry Laboratory at the University of California, Davis. All horses competing in Breeders' Cup races this past weekend at Del Mar were tested for TCO2 levels in blood. Post-race testing was performed for prohibited drugs on the first four finishers in all Breeders' Cup races and any additional random horses selected by the stewards consistent with California Horse Racing Board protocol. Post-race testing was done on both blood and urine samples. The...