QUEST DIAGNOSTICS INC revenue for the last year amounted to 205.83 B MXN, the most of which — 200.45 B MXN — came from its highest performing source at the moment, Diagnostic Information Services, the year earlier bringing 152.46 B MXN. The greatest contribution to the revenue figure was made by United States — last year it brought QUEST DIAGNOSTICS INC 205.83 B MXN, and the year before that — 157.15 B MXN.