上游法與 分層離心法均無法有效提高Y精蟲之比率

上游法與Percoll分層離心法分離 Y精蟲之比例類似 (52.4% vs 53.8%)
上游法與 分層離心法均無法有效提高Y精蟲之比率

http://www.ccivf.com/pdf_files/pdf%20articles/CATEG~10/005.PDF

Male:female sex ratio in births resulting from IVF according to swim-up versus Percoll preparation of inseminated sperm,
Archives of Andrology, Jul-1994 (Full Text)

IVF births after the use of the Percoll method or the standard swim-up technique were both found to be close to 50% boy/girl.

• Sperm samples were prepared for use in IVF in one of two ways: a) by the standard swim-up technique (the standard technique used to prepare sperm for IUI or IVF, not the modified swim-up attempted for gender selection); and b) by a 3-layer Percoll density gradient centrifugation.
• Swim-up: Of the 103 resulting pregnancies, 125 babies were born (82 singletons, 20 sets of twins and 1 set of triplets). Boy births accounted for 53% of the babies (52% of the singletons, and 51% of multiples).
• Percoll: Of the 34 resulting pregnancies, 41 babies were born (26 singletons, 6 sets of twins, 2 sets of triplets). Boy births accounted for 50% of the babies (54% of the singletons and 40% of multiples).
• [Don't read anything in to the fact that only 40% of the Percoll multiples were boys; with only 18 babies, just one baby more or less of either gender can significantly skew the percentage.]