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Endocrine Abstracts (2025) 110 EP1179 | DOI: 10.1530/endoabs.110.EP1179

1Hospital Universitario Clínico San Cecilio, Granada, Spain.


JOINT2449

Introduction: Hyperprolactinemia is a frequent cause of referral to endocrinology outpatient clinics, which is due to many causes (physiological, pharmacological, pathological). Once some have been excluded, many studies recommend performing a serial prolactin measurement to rule out stress hyperprolactinemia, although it isn’t standardised. Objective: to evaluate the usefulness of serial prolactin measurement to confirm hyperprolactinemia diagnosis.

Materials and Methods: Descriptive study of 60 patients who underwent serial prolactin measurements between the years 2023-24 in follow-up in our clinics. Demographic (sex, age) and analytical (basal prolactin, at 20 and 40 minutes) variables were collected. Regarding the measurement, a peripheral intravenous line was inserted and a baseline, at 20 and at 40 minutes value was taken. It was established that prolactin was elevated above 20 (men) or 25 (women). The statistical analysis was performed with the IBM SPSS v.25 programme (Statistical significance P <0.05).

Results: 60 patients were analysed, 80% women with a mean age of 31.1 ± 14.7 years. 66.7% and 70% showed normal prolactin values at 20 and 40 minutes, respectively. Basal and 20-minute prolactin and basal and 40-minute prolactin means difference were 4 ± 7.1 and 6.5 ± 10.8, with a statistical significance of 0.01 in both.

Conclusions: In most patients, prolactin levels become normal after 20 and 40 minutes of sampling, after removing other confounding factors that may lead to stress hyperprolactinemia. A statistically significant difference is also observed between baseline, at 20 and at 40 minutes values. This demonstrates the usefulness of the measurement to rule out stress hyperprolactinemia, as well as to avoid redundant complementary tests and avoid unnecessary worries for the patient.

Volume 110

Joint Congress of the European Society for Paediatric Endocrinology (ESPE) and the European Society of Endocrinology (ESE) 2025: Connecting Endocrinology Across the Life Course

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