SUN-222 Pre- and Post-Pubertal Reference Ranges for Oxygenated Androgens in Saliva

Abstract Oxygenated androgens such as 11 β-hydroxyandrostenedione (11OHA4) and 11-ketotestosterone (11KT) contribute significantly to the androgen pool in humans and their measurement has been shown to be useful in diagnosing disorders such as polycystic ovarian syndrome or premature adrenarche and also in monitoring treatment of congenital adrenal hyperplasia, alongside the classical androgens. Their measurement in saliva is particularly advantageous due to the non-invasive nature of sampling, meaning samples can easily be taken regularly to monitor treatment; however reference range data is not currently available for 11OHA4 and 11KT, limiting their clinical use. These analytes were measured in saliva samples from pre and post-pubertal males and females to inform reference ranges for these analytes. Samples collected into salivettes as part of the PRIMMS study (Technische Universität Dresden) were used for this work. A total of 130 samples (35 from pre-pubertal females, 43 from post-pubertal females, 42 from pre-pubertal males and 20 from post-pubertal males) were analysed for 11OHA4 and 11KT by LC-MS/MS. The ages of the participants ranged from 3.77 to 14.0 years in the pre-pubertal samples and 13.9-17.9 years in the post-pubertal samples. Pubertal status was determined clinically. The upper cut-off of the reference interval for 11OHA4 was 560 pmol/L in pre-pubertal females and 590 pmol/L in males, whilst 11KT had an upper limit of 216 pmol/L in females and 205 pmol/L in males. The upper limits of the ranges were higher in post-pubertal samples, with ranges of up to 1542 pmol/L in females and 1775 pmol/L in males for 11OHA4; the ranges for 11KT were up to 654 pmol/L for post pubertal females and 585 pmol/L for post-pubertal males. The data shows, as expected, a rise in the 11 oxygenated androgens post puberty. The upper limits of reference intervals for both analytes were very similar in males and females both pre- and post pubertally. These data can be used to inform clinical interpretation of the 11-oxygenated androgens; further work is required with larger cohorts of samples to develop more robust reference ranges.