Endometriosis often takes years to confirm, and many women cycle through repeat imaging and laparoscopy before anyone names it. A reliable blood test would shorten that path, so the field keeps hunting for serum signals. A new BMC Medicine study put NMR-based metabolomics to a harder test than usual. Instead of comparing patients only against healthy donors, a Tübingen-led team asked whether a serum metabolite and lipoprotein panel could separate surgically confirmed endometr