The traditional medical service functions as an integral part of the national healthcare delivery system. It is available in all 20 districts and is housed under the same roof of district hospital for mutual consultation, treatment and cross referrals. The system is quite popular especially amongst the older population and treats about 20-30% of the daily OPD patients in the district hospitals. The national hospital in Thimphu treats about 200 - 250 patients per day in summer and about 150 to 200 patients in winter.