The hypocalcaemia induced by the infusion of EDTA caused a transient increase in plasma intact PTH from a baseline value of 27 ± 16 ng/l to a peak value of 98 ± 38 ng/l after the end of the 30 min infusion (at 33 min), with subsequent rapid decrease near to the baseline values (Fig. 1B). This evidence concerns the gene PTH and Hypocalcemia.