Hi Sherry ,
well my additional medical tests were basing on a Cardiologist report and Creatanine test to verifiy the blood pressure and the kidneys ,
so i did serum Creatanine and went to see the cardiologist who told me nothing was wrong , i don' t think it really delayed my case the delay was rather on my side coz when they asked for additional tests i wasn' t in China so i asked for time extension and on March 1st i did the add medicals , on april 21st i got the PPR so not that long ...
No worries u will be fine .
Cheers