When checking for ovarian cancer, using a combination of tests finds more cancers early than using just an ultrasound, but both methods are really good at saying you don’t have cancer when you really don’t.

The study checked two ways to find ovarian cancer early: one uses a blood test plus ultrasound, and the other uses ultrasound alone. It found that the blood-plus-ultrasound method caught more cancers (83.8% vs 72.2%) and both were very good at saying you didn’t have cancer (99.8% vs 99.5%), which is exactly what the claim says.