Non-invasive laboratory diagnosis of deep venous thrombosis.

Both legs of 52 patients, in whom deep thrombosis was clinically suspected in one leg, were investigated. Out of the 52 legs used as a control, without suspected deep venous thrombosis, two were found to have deep venous thrombosis. Laboratory findings revealed that deep venous thrombosis was not present in 25% of the cases suspected. The patients in this group did not require venogram and were not treated. Nineteen suspected legs (36.5%) were proved negative not only by the laboratory method but also by venography.