Background: Hypothyroidism has been associated to hyperprolactinemia. The aim was to establish the frequency of high thyrotropin (TSH) levels in women with hyperprolactinemia.
Methods: Retrospective, observational, open, and non-controlled study, which included all the non-pregnant women whose prolactin (PRL) and TSH levels were measured between January 1 and December 31, 2014.
Results: 437 women were studied. The most frequent diagnoses that motivated PRL measurement were: infertility (31.7%), polycystic ovary syndrome (18.7%), and amenorrhea (7.8%). In the whole group TSH levels were 2.5 ± 2.7 µUl/mL and those of PRL 16.5 ± 13.2 ng/dL. From the total of women, those with normal PRL levels, 1.4% had low TSH levels, 76.6% normal and 7.5% high, while in those with high PRL levels 0.7% had low TSH levels 12.6% normal and 1.1% high. Of those 374 patients with normal PRL, 6 (1.6%) had low TSH levels, 335 (89.6%) normal TSH levels, and 33 (8.8%) high TSH levels. Of those 63 patients with high PRL, 3 (4.8%) had low TSH levels, 55 (87.3%) normal TSH and 5 (7.9%) high TSH levels.
Conclusion: In this study it was not possible to document that the proportion of patients with high TSH was greater in those with hyperprolactinemia.
Introducción: el hipotiroidismo se suele asociar con hiperprolactinemia (HPRL). Se buscó determinar la frecuencia de tirotropina (TSH) elevada en mujeres con HPRL. Métodos: estudio retrospectivo, observacional, abierto y no controlado que incluyó a todas las mujeres no embarazadas en quienes se detectó la prolactina (PRL) y la TSH del 1 de enero al 31 de diciembre de 2014. Resultados: se estudiaron 437 mujeres. Los diagnósticos que motivaron la solicitud de PRL fueron: infertilidad (31.7%), síndrome de ovarios poliquísticos (18.7%) y amenorrea (7.8%). En el grupo completo las concentraciones de TSH fueron 2.5 ± 2.7 µUl/mL y las de PRL 16.5 ± 13.2 ng/dL. Del total de pacientes, aquellas con PRL normal, 1.4% tuvo TSH baja, 76.6% TSH normal y 7.5% elevada, mientras que de aquellas con PRL elevada 0.7% tuvo TSH baja, 12.6% normal y 1.1% elevada. De las 374 pacientes que tenían PRL normal, 6 (1.6%) presentaron TSH disminuida, 335 (89.6%) TSH normal y 33 (8.8%) TSH elevada. De las 63 pacientes con PRL elevada, 3 (4.8%) presentaron TSH disminuida, 55 (87.3%) TSH normal y 5 (7.9%) TSH aumentada. Conclusión: no se logró documentar que la proporción de pa-cientes con TSH elevada fuera mayor en aquellas con HPRL.
Keywords: Hypothyroidism; Prolactin; Thyroid-stimulating hormone.