MSFinals-0432

A study investigating the effectiveness of D-dimer testing in detecting DVT analyzed the medical records of 800 patients. To be eligible for the study, D-dimer had to be measured and DVT must have been confirmed by ultrasound.
Out of the 800 patients, 720 had positive D-dimers and 80 had negative D-dimers.
What is the sensitivity of D-dimer measurement in identifying DVT?