Doping is also at the center of a standoff between the National Football League (NFL) and players on what constitutes a positive HGH test and what experts should decide.
Oversight Committee Chairman Darrell Issa (R-Calif.) and ranking member Elijah Cummings (D-Md.) have promised to find government medical experts who are acceptable to both sides.
In their statement late Wednesday, Issa and Cummings called on the NFL to implement a "robust" testing regime.
"Major League Baseball’s announcement increases the pressure on the NFL and its players to deliver on pledges to conduct HGH testing made in their collective bargaining agreement that was signed two years ago," the lawmakers said.