PTH and Hypocalcemia: Regarding instruments potentially useful in reducing post-surgical hypocalcaemia through better identification and functional preservation of the parathyroids, intraoperative biopsy, rapid PTH dosage on aspirate [44,45,46,47] and gamma probe identification [48], which were proposed in the past and are now obsolete because they are invasive, costly, time-consuming and ethically inapplicable as they damage tissue that should ideally be preserved as much as possible, are now rarely used.