I currently have a multi-entry tourist visa and I am set to apply for my Z-visa in Singapore. I have two questions.

1) On the PRC Embassy in Singapore website, they list a medical report as a required document but don't provide a list of certified clinics to havethe physical done nor is their a form on can take to the doctor to complete. Does anyone have experience with wether this is really a requirement and if so where ca I go in Singapore to take the exam? Note, my employer says I will take a required physical upon my arrival.

2) Once I have my z-visa, can I still make a leisure trip to China and enter using my stil valid multi-entry tourist visa? I would like to enter and exit China with the tourist visa and then enter shortly after with my Z-visa and report to my employer.