[Blood erythropoietin levels in healthy subjects studied in the valley of Mexico].

Erythropoietin (EPO) is the hematopoietic growth factor that regulates red cell production. There is a direct relationship between its secretion and tissue hypoxia. Above sea level, oxygen concentration diminishes.

[Thyroid function tests in healthy and ill elderly].

Thyroid function in the elderly has been a matter of discussion. The universe of the present study includes males and females 36 hospitalized with an average age of 72.97 +/- 8.