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Original article
Serial prolactin sampling as a confirmatory test for true hyperprolactinemia
Curva de prolactina para la confirmación de hiperprolactinemia real
Carla Francésa,
Corresponding author
cfrancesartigas@gmail.com

Corresponding author.
, Evangelina Boixa,b, Maria Teresa Fajardoc, José Manuel Gómez-Garcíad
a Endocrinology and Nutrition, Internal Medicine Department, University General Hospital of Elche, Elche, Spain
b Miguel Hernández University of Elche, Elche, Spain
c Laboratory Department, University General Hospital of Elche, Elche, Spain
d Preventive Medicine Department, University General Hospital of Elche, Elche, Spain
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Table 1. Comparative of variables between patients with confirmed hyperprolactinemia and those without it.
Abstract
Introduction

Hyperprolactinemia may be due to physiological or pathological causes, and may be asymptomatic or induce hypogonadism, infertility, and/or galactorrhea. It is important to take prolactin samples while avoiding stress, as this may increase prolactin levels. Therefore, our aim was to assess the value of prolactin serial sampling after brachial vein cannulation.

Patients and methods

Sixty-six patients (34.9±11.8 years of age, 92.4% female) with an initial elevated random prolactin level were included. A prolactin sample was drawn at baseline and after a 30min rest.

Results

The median referral prolactin level was 37.4ng/ml (interquartile range [IQR* 23.3), the baseline prolactin level at serial sampling was 19.5ng/ml (IQR 8), and the value after a 30min rest was 17.1ng/ml (IQR 7.9). Hyperprolactinemia was not confirmed by serial sampling in 45 patients (68.2%). There were no statistically significant differences in referral prolactin levels between patients with and without confirmed hyperprolactinemia (41.2ng/ml and 36.7ng/ml respectively, p=0.3). Galactorrhea was found in 13.6% of patients, amenorrhea or oligomenorrhea in 28.8%, infertility in 7.6%, erectile dysfunction in 4.6%, and gynecomastia in 3%, while 45.5% were asymptomatic. There were no statistical differences regarding the presence or absence of any of these symptoms and subsequent confirmed hyperprolactinemia. Fifty-seven patients (86.4%) were discharged after the results of the prolactin serial sampling were obtained.

Conclusions

Prolactin serial sampling may be a useful test to detect artefactual hyperprolactinemias, thus avoiding unnecessary additional tests and treatments.

Keywords:
Hyperprolactinemia
Prolactin serial sampling
Cannulated
Rest
Resumen
Introducción

La hiperprolactinemia puede ser debida a causas fisiológicas o patológicas, y puede ser asintomática o inducir hipogonadismo, infertilidad y/o galactorrea. Es importante obtener las muestras de prolactina evitando situaciones de estrés, puesto que este puede incrementar sus niveles. Por tanto, nuestro objetivo era evaluar la utilidad de la realización de curvas de prolactina mediante canalización de la vena braquial.

Materiales y métodos

Se incluyeron 66 pacientes (edad: 34,9±11,8 años; 92,4% mujeres) con una prolactina aleatoria inicial elevada. Se obtuvieron una muestra de prolactina basal y otra tras un reposo de 30min.

Resultados

La prolactina mediana inicial fue 37,4ng/ml (IQR: 23,3), la prolactina basal de la curva 19,5ng/ml (IQR: 8), y tras 30min de reposo, 17,1ng/ml (IQR: 7,9). La curva descartó una hiperprolactinemia en 45 pacientes (68,2%) No hubo diferencias estadísticamente significativas en la prolactina de derivación entre aquellos pacientes en los que se confirmó una hiperprolactinemia y aquellos que no (41,2 vs. 36,7ng/ml; p=0,3). Un 13,6% de los pacientes presentaron galactorrea, un 28,8% amenorrea u oligomenorrea, un 7,6% infertilidad, un 4,6% disfunción eréctil y un 3% ginecomastia. El 45,5% estaban asintomáticos. No hubo diferencias estadísticamente significativas entre la presencia o ausencia de ninguno de estos síntomas y una hiperprolactinemia confirmada posteriormente. Se pudo dar de alta a 57 pacientes (86,4%) tras la obtención de los resultados de la curva de prolactina.

Conclusiones

La curva de prolactina puede ser una prueba útil pata detectar falsas hiperprolactinemias, evitando la realización de pruebas complementarias y tratamientos adicionales innecesarios.

Palabras clave:
Hiperprolactinemia
Curva de prolactina
Canulada
Reposo

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