Establishing health goals or benchmarks can help you decide when to implement some diagnostic testing.

Watch trends. If the goal is to treat less than 10 percent of the herd for respiratory disease, then when the trend starts going up or down, additional diagnostic testing may improve treatment and prevention strategies, says Sheila McGuirk, a veterinary clinician at the University of Wisconsin School of Veterinary Medicine. Diagnostic testing with improved health screening of calves will improve the health and performance of your calves.