Dear Colleague,
We had a recent incident in which we detected a raised troponin T (0.156 ug/l) in a 49 yr women with non-specific chest pain who had attended her GP. The result was telephoned to the GP and the lady urgently attended A&E; ECG was normal and repeat Troponin T was < 0.01 ug/l. The original sample (0.156 ug/l) was re-run and found to be < 0.01 ug/l.
We contacted Roche who fully investigated the incident and concluded that the possible "root cause" was likely to be EMI (Electro-Magnetic Interference) from use of mobile phones in close proximity to the instrument. They also mentioned other potential causes such as "gripper dirt" and "foam on reagents". They have recommended that usage of mobile phones be restricted, particularly when troponin T is being measured.
I am really shocked by the possibility of EMI and I really find it hard to believe! However, if it is possible then it would have major implications for the use of mobile phones, wireless networks etc within all laboratories. It is interesting that the Roche engineers have no difficulty in using their mobile phone in close proximity to instruments when they are servicing equipment.
I would value your thoughts on this.
Best wishes
Peter
Dr Peter Sharpe
Consultant Chemical Pathologist
Director of Research and Development
Southern Health & Social Care Trust
Ext 2657
Tel 028 38612657
Fax 028 38334582
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