The most common method is based on restriction fragment length polymorphism–polymerase chain reaction (RFLP-PCR). RFLP analysis of 5.8S rRNA gene and some of the internal transcribed spacers is a good choice.

http://www.microbiologyresearch.org/docserver/fulltext/ijsem/49/1/ijs-49-1-329.pdf?expires=1512301831&id=id&accname=guest&checksum=3CA8AFF047F6A72C6C3EECFDB6307C9A

Hi,

You must to known morphology of yeast cells and biochemical test or use PCR Technic for identification of yeast.

PCR technique is the best way