Check “The ‘70% claim’: what is the evidence base?” https://journals.sagepub.com/doi/full/10.1258/acb.2011.011177 or “Dispelling the 70% Claim with Laboratory’s True Value” https://www.medlabmag.com/article/1406.
This interesting publication by Quest promotes the claim, but provides no proof. “70% of medical decisions are based on lab results. Solutions to optimize operations, improve quality and lower costs at hospital clinical labs.” http://www.questdiagnostics.com/dms/Documents/PLS/35841-FIN-WP-Hospital_Lab_Management-WP4289.pdf
Where do we go from here? How would one quantify the value of laboratory results? I would like to believe this is true, but I need proof. I would happily help crunch and publish data if anyone wants to publish.
Laboratory results undeniably have value. They also carry risk and cost to patients and the healthcare system.