Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the use in this Amendment No. 1 to Registration StatementNo. 333-231703 on Form S-1 of our report dated March 27, 2019 (June 4, 2019 as to effects of the reverse stock split described in the second paragraph in Note 2) relating to the consolidated financial statements of Personalis, Inc. and subsidiary appearing in the Prospectus, which is part of this Registration Statement.
We also consent to the reference to us under the headings “Experts” in such Prospectus.
/s/ DELOITTE & TOUCHE LLP
San Jose, California
June 7, 2019
