Director/PDMR Shareholding

Immunodiagnostic Systems Holdings PLC ("the Company")

22 March 2010

Director's Dealings

The Company announces that on 18 March 2010, Roger Duggan, Chief Executive Officer, transferred 15,168 ordinary shares of 2 pence each in the Company ('Ordinary Shares') to his SIPP at a price of 764.75 pence per share.

Following this transfer, Mr Duggan's notifiable interest in the Company remains unchanged at 2,276,187 Ordinary Shares representing 8.2 per cent of the issued share capital.

Contacts:

Immunodiagnostic Systems Holdings PLC 0191 519 0660

Roger Duggan, CEO

Paul Hailes, Finance Director

Brewin Dolphin Investment Banking 0845 213 4730

Andrew Emmott

Walbrook PR Ltd 020 7933 8787

Paul McManus 07980 541 893