AMA data were used to estimate the outflow (DECREMENTS) relative to the inflow (INCREMENTS) of foreign-trained doctors in the United States between year end 1966 and 1968. The estimated minimum medical brain gain amounts to roughly 9,000 for the two years or roughly 7,500 if U.S. citizens are excluded. The ratio of INCREMENTS to DECREMENTS is 4:1. Visa information on FMGs (foreign medical graduates) shows that 50 per cent of the INCREMENTS have the option of permanent stay in the U.S. Data on country of medical education combined with citizenship information on FMGs indicate migration patterns and suggest that many foreign doctors migrate several times.