Earlier studies have suggested different methods, such as hypo-osmotic swelling (HOS) test, mechanical touch and laser touch techniques, and pentoxifylline (PF) addition, for the selection of viable sperms from testicular biopsy samples, in order to improve ART outcomes. A recent open, comparative, prospective study has reiterated that selecting viable sperms using the PF method is superior to the HOS test with regard to fertilization and pregnancy rates. The findings were published in the recent issue of the journal, Fertility and Sterility. Read the full story