Another method which estimates whether a horse is fit or unfit to race is the bloodcount on the morning of the race, or more practical, the day before, and duly reported in the press. So what...., it may cost more to do so , which will inevitably be passed on to we the punters, but it may also prevent us backing losers on which we placed speculative bets , believing they were fit for racing.
I am very adamant about this subject as I believe that it tells you whether class horses coming back early in their preparation are fit and ready to contest the race in question.