Abstract: | Sir, It has been documented that certain gadolinium-based magneticresonance contrast agents injected for enhancement of magneticresonance imaging (MRI) or for angiography in selected patients,i.e. gadodiamide (Omniscan®) and gadoversetamide (Optimark®),can cause spurious hypocalcaemia, due to interference with colorimetricassays in a dose-dependent way [14]. Three other agentsapproved for clinical use, gadopentetate |