Amanda Knox will learn later if she is to be granted a review of the forensic evidence used to convict her of the murder of student Meredith Kercher.
The 23-year-old American is trying to overturn her conviction after being jailed last year for 26 years for the killing in Perugia, Italy, in 2007.
Miss Kercher, 21, from Coulsdon, south London, was found with her throat cut.
A review would include the disputed DNA evidence found on a knife and on the clasp of Miss Kercher's bra.
Knox's former boyfriend, Raffaele Sollecito, was jailed for 25 years for the murder. He is appealing together with Knox.
The original trial heard the pair had cornered Miss Kercher after starting a sex game with Ivorian drug dealer Rudy Guede, who was jailed for 30 years for the killing, although that was reduced to 16 years on appeal.
The Leeds University student's semi-naked body was found partially covered by a duvet in her bedroom in the house she shared with Knox in Perugia. BBC News
