I'd like to know if the levels of phosphate in regular synthetic complete medium are similar than in YPD. Synthetic compete medium is considered as a high phosphate medium; is YPD also a high phosphate medium?
Yes, YPD contains quite some phosphate. Of course whether you can use it depends on your downstream analysis. For example it is not suitable for P32 labeling. There are recipes for low phosphate YPD: http://plaza.ufl.edu/alaricf/Protocols/MediaSolutions/MediaYPDLPAndGeneticin.pdf