GAMCA Medical??

What can be done if someone fails their GAMCA medical when can they repeat the medical again?
As the person is perfectly healthy but the GAMCA medical report is issued as unfit and they do not give any valid reason!
Does a failed medical mean that the issued visa can not be used?

I am Yemeni lady residing in Saudi Arabia and got job opportunity in Bahrain they requested me to make medical check.
My question is what is the approved medical center in Riyadh and will be approved by the Bahraini visa Authority?

First go to the gamca medical website then get medical appointment like token.then website automatically generate the register gamca medical lab on your medical appointment slip