The document describes a pilot study that investigated the presence of DNA in blastocyst fluids (BFs) and whether the chromosomal status predicted by analyzing this DNA corresponds to the status in trophectoderm (TE) cells and the whole embryo. The study found that: 1) DNA was detected in the BFs of 76.5% of blastocysts tested, allowing chromosomal analysis of these samples. 2) In 97.4% of cases, the ploidy condition (euploid vs. aneuploid) predicted by BF analysis matched the condition in TE cells. 3) BF analysis predicted the ploidy condition of the whole embryo with 100% accuracy