AMENDMENTS TO International Prohibited / Forbidden Substance Thresholds 

The NHA has introduced the following additional international prohibited / forbidden substance thresholds. These are in line with corresponding amendments introduced by the International Federation of Horseracing Authorities (IFHA). These thresholds, which relates to NHA Rule 73.4.4 are effective 1 August 2018.

• Testosterone                         100 picograms free testosterone per millilitre in plasma from fillies and mares (unless in foal) 

•  Prednisolone                        0.01 microgram free prednisolone per millilitre in urine 

This information is published under the Laboratory section of the NHA website.