[Reference Intervals for total triiodothyronine (TT3), free thyroxine (FT4), and thyrotropin (TSH) by chemiluminescence immunoassay in children younger than six years old from northeastern Mexico].

Background: Reference values according to age groups for each population are needed for the diagnosis and follow-up of pediatric patients with thyroid diseases. Such values are unknown for Mexican infants and children younger than six years.

Objective: To determine the reference values of total TT3, FT4 and TSH by chemiluminescence immunoassay in infants and children younger than six year old in Northeastern Mexico.

Molecular detection of cryptic Y-chromosomal material in patients with Turner syndrome.

A systematic search for a hidden Y-chromosome mosaicism, in Turner syndrome (TS) patients is justified by the evaluation of the risk of development of germ cell tumors. In this study, we analyzed cryptic Y-chromosome derivatives by polymerase chain reaction (PCR) coupled with fluorescence in situ hybridization (FISH) using Y-specific sequences in patients with TS, and validated this methodology. Unrelated patients with TS (n=32) of Mexican mestizo ethnic origin were diagnosed using cytogenetic analysis.