"week prior" is correct and usable in written English.
It is used to refer to a time period that happened one week before the current time. For example, "I visited the museum a week prior and was quite impressed."
All readings are emailed a week prior.
Each glove was worn for one week prior to testing.
Complete the study guide responses 1 week prior to class.
Fibroblasts were inoculated on collagen sponge and cultured for 1 week prior to inoculation of ESCs.
A country has laws making it illegal to run polls the week prior to elections?
For the week prior to the holiday, Mr. Greengrass will work each day until 1 a.m.
Only a week prior to Purim, Iranians were selecting politicians for their 290-seat parliament.
Just a week prior, that darling merman Michael Phelps had experienced his own fall from grace.
"Typical me, I forgot my own birthday," said Ellery, who had turned 35 the week prior.
A total of 56 students were recruited the week prior to the experiment.
Treatment with KBU2046, incorporated into Harlan Teklad 2016S® chow, began 1 week prior to implantation.
