Ready for some bad news? Historically, med school loans have been written at a fixed interest rate when you consolidate upon graduation. There is serious discussion to move to a variable rate (probably a prime plus scheme) loan. Med School loans are subsidized by the Federal Goverment so that low interest rates don't scare away investors, and med students don't get scared away by high interest & incredible debt. But now the government is getting scared because in recent years rates are under 4%. (If I recall correctly, my wife's loan is around 3.7% or so).
If/when interest rates go up, the government will have to cough up the difference to keep the investors in the market. So, in the future, they want to make them variable rate and let the borrowers pay more, which defeats the whole purpose of the subsidy to begin with!