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Background: Patients with hypoparathyroidism are at risk of both hypocalcemic and hypercalcemic crisis. Patients report that health professionals do not always respond adequately in an acute situation. The extent and handling of severe hypo- and hypercalcemia in hypoparathyroidism is unknown.Aims: To outline the need for a medical emergency card for primary hypoparathyroidism.Method: Postal survey amongst Norwegian and Swedish patients with chronic hypoparathyroidism of all causes. Altogether 455 invitations were sent (333 from Norway and 122 from Sweden).Results: Three hundred and thirty-six of 455 (74%) patients responded (253 from Norway and 83 from Sweden). The majority were women (79%), and the main cause was postsurgical hypoparathyroidism (66%). Overall 44% and 16% had been hospitalized at least once for hypo- or hypercalcemia, respectively. Eighty-seven per cent felt that an emergency card would be highly needed or useful. Amongst those hospitalized for hypocalcemia, 95% felt a card was needed compared to 90% amongst those hospitalized for hypercalcemia. Five per cent believed that a card would not be useful.Conclusions: The majority answered that an acute card is highly needed or useful. Hospitalization for acute hypocalcemia was more common (44%) than for acute hypercalcemia (16%). As a result of this survey, an emergency card will be distributed in three European countries to test its utility. [ABSTRACT FROM AUTHOR]