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We report the case of a male in his late teens who presented to our emergency department with acute generalised tonic-clonic seizures. Neurological examination, neuroimaging and laboratory tests confirmed severe hypocalcaemia, secondary to hypoparathyroidism, as the cause of his seizures. A detailed history was significant for recurrent urinary tract infections and epilepsy, accompanied by impaired academic performance and an intracardiac repair 8 years prior to presentation for a congenital cyanotic heart disease. Dysmorphic features on clinical examination, accompanied by the chronicity of complaints, led us to consider a genetic syndrome. On genomic microarray analysis (GMA), a 22q11.21 deletion was detected. The present case aims to highlight how commonly encountered laboratory findings, such as hypocalcaemia, can facilitate the identification of genetic associations like 22q11.2 deletion syndrome (22q11.2DS), a rare diagnosis in adulthood. In many cases, clinical problems may be managed in isolation without triggering a unifying diagnosis.