What are ‘Threshold Levels’? How are they different to Screening limits?

17 Jul 14

For substances endogenous to the horse (that is, substances that occur naturally within the horse), threshold levels are agreed by the International Federation of Horseracing Authorities (IFHA). So if a sample contains any of the endogenous substances listed at a higher concentration than the threshold level, this leads to a positive test result being given.

A full list of substances that have Threshold Levels, and the levels themselves, can be found on the IFHA website under Article 6 of the International Agreement on Breeding, Racing and Wagering and these are included in the Rules of Racing.