The objectives of this study are:

1. To determine the prevalence and degree of hyperprolactinemia in children and adolescents aged 7-18 years receiving antipsychotic medications
2. To determine the associations between serum-prolactin and sex hormones / metabolic biomarkers/ clinical symptoms in this population. If clinically relevant associations are found: To determine a potentially existing "no harm" serum-prolactin threshold
3. To determine associations between previous cumulative prolactin-exposure and current pubertal development / growth

Inclusion Criteria:

• • In daily treatment with antipsychotic medication belonging to Anatomical Therapeutic Chemical (ATC) group N05A (except N05AN lithium) for a minimum duration of 3 months prior to inclusion

Exclusion Criteria:

• Eating Disorder
• Medical treatment to change sex
• Pregnancy or lactation

All outpatients aged 7-18 years receiving treatment with antipsychotics at the Department of Child and Adolescent Psychiatry, Aalborg University Hospital, the Department of Child and Adolescent Psychiatry, Aarhus University Hospital and at the Child and Adolescent Mental Health Center, Copenhagen University Hospital, Capital Region will be invited to participate in the study.