AI could (and probably now can) decide on the ‘best test’.
AI could (and probably now can) interpret test results.
AI could (and probably now can) lay out a treatment plan.
AI could guide a surgery with image generation.
Yes, AI can or will eventually do all those things, but the cost is the destruction of the human knowledge and human capital base.
Making the entire human race dumber is probably not the best use of technology.