Exercise of Share Options

Immunodiagnostic Systems Holdings PLC

Exercise of Share Options and Total Voting Rights

Immunodiagnostic Systems Holdings PLC ("the Company"), a leading producer of diagnostic testing kits, announces that on 23 April 2010, 2,674 ordinary shares of 2p each in the Company (the "Ordinary Shares") were allotted in a board meeting to satisfy an exercise of options exercised under the Company's SAYE scheme.

Application will be made at the earliest practicable opportunity for admission of the new ordinary shares to trading on AIM.

Total Voting Rights

In accordance with FSA's Disclosure and Transparency Rules, the Company advises that its increased issued share capital comprises 27,857,240 Ordinary Shares. The voting rights of all of these shares are identical with each share carrying the right to one vote. The Company holds no ordinary shares in Treasury. The above figure may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Immunodiagnostic Systems Holdings PLC under the Disclosure and Transparency Rules.

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