GenMark Diagnostics (GNMK) S-8 Registration of securities for employees

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports relating to the financial statements of GenMark Diagnostics, Inc. and subsidiaries (the “Company”) (formerly Osmetech plc and subsidiaries), and the effectiveness of the Company’s internal control over financial reporting dated March 14, 2013, appearing in the Annual Report on Form 10-K of the Company for the year ended December 31, 2012.

/s/ Deloitte & Touche LLP

San Diego, CA

June 14, 2013