reason:
positive Chvostek sign is a clinical indication of hypocalcaemia. It is elicited by tapping or striking the facial nerve just anterior to the ear, causing facial twitching. This sign is associated with the irritability of nerves due to decreased calcium levels. Reporting this finding to the healthcare provider is important because it suggests a potential complication related to untreated hypoparathyroidism.

reason:
Muscular weakness can be a symptom of hypocalcaemia, but it is a more general finding and can be caused by various factors. It may not be as specific to hypocalcaemia as the Chvostek sign.

reason:
A positive Coombs test is related to haemolytic anaemia, which is not directly associated with hypocalcaemia.

reason:
Rapid weight gain is not a characteristic or specific finding of hypocalcaemia. It may be related to other factors such as fluid retention, dietary intake, or other medical conditions