Searchable abstracts of presentations at key conferences in endocrinology

ea0094p380 | Reproductive Endocrinology | SFEBES2023

Development of an LC-MS/MS assay for seven salivary steroids including the 11-oxygenated androgens

McTaggart Malcolm , Hawley James , Keevil Brian

For several years, steroid hormones including testosterone (T), androstenedione (A4) and 17-hydroxyprogesterone (17-OHP) have been utilised in the diagnosis of a range of conditions with clinical features of hyperandrogenaemia including polycystic ovary syndrome (PCOS) and congenital adrenal hyperplasia. In recent years a potential role for the 11-oxygenated androgens has emerged in the diagnosis and characterisation of androgenic disorders. Specifically, the 11-oxygenated and...

ea0086p20 | Adrenal and Cardiovascular | SFEBES2022

Cortisol/cortisone measurement in sweat samples

Keevil Brian , Marshall David , Adaway Jo , Hawley James

Introduction: Alternative biofluids such as sweat, which can be obtained non-invasively and present a simpler matrix composition than serum/plasma or urine, may be useful for monitoring biomarkers. The long-term sampling with patches either on the chest or back can be conveniently used under both rest and exercise conditions to provide an integrated response of free biomarkers over the course of a day. The smaller sample volumes generated by sweat collection can be convenientl...

ea0034p44 | Clinical biochemistry | SFEBES2014

Measurement of dexamethasone by LC–MS/MS after a 1 mg overnight dexamethasone suppression test

Debono Miguel , Newell-Price John , Hawley James , Keevil Brian

Background: The overnight dexamethasone (DEX) suppression test is useful for the investigation of hypercortisolism, however several factors may influence its performance. Intestinal uptake of DEX, inactivation by conversion by CYP3A4 in the liver and renal clearance can all affect test variability. It is also known that several drugs can either reduce or accelerate CYP3A4 activity, thereby affecting blood DEX concentrations. Interpretation of the test would be greatly enhanced...

ea0094p5 | Adrenal and Cardiovascular | SFEBES2023

Salivary Steroid Profile: the simultaneous quantification of androgens, glucocorticoids, and mineralocorticoids in human saliva

Bain Joshua , Gilligan Lorna , Hawley James , Taylor Angela

Steroid profiling of biological fluids has been used for clinical and diagnostic research since the 1950s. Most methods focus on blood and urine, however, more recently saliva analysis has been employed as a non-invasive, simple to collect sample for the diagnosis of conditions such as Cushing’s and androgen excess. Despite its ease of collection, saliva remains an underutilised biofluid. To investigate the use of salivary steroid profiling for endocrine research, we aimed to ...

ea0081p698 | Reproductive and Developmental Endocrinology | ECE2022

The biochemical investigation of PCOS: a UK wide survey of laboratory practice

M Hawley James , Marrington Rachel , MacKenzie Finlay , Adaway Jo , Taylor Angela , Arlt Wiebke , Keevil Brian

Background: Polycystic ovary syndrome (PCOS) is a heterogenous condition that affects approximately 12% of females. The diagnosis can be complex and biochemistry tests are routinely relied upon to help identify hyperandrogenaemia and to exclude other conditions. However, although national and international guidelines advocate the use biochemistry tests, little information is provided as to which tests should be used and which other endocrinopathies should be excluded.<p cl...

ea0081ep105 | Adrenal and Cardiovascular Endocrinology | ECE2022

Serum cortisol immunoassay performance in the overnight dexamethasone suppression test.

Atkins Jonathan , Owen Laura , Clayton Jonathan , Hawley James M , Scargill Jonathan , Keevil Brian

Background: The 1 mg overnight dexamethasone suppression test (ONDST) is recommended for the differential diagnosis of Cushing’s syndrome and the investigation of adrenal incidentalomas. However, diagnostic performance of the test relies on accurate methods to quantitate cortisol in serum. Although the variable performance of serum cortisol immunoassays has been well-documented, little has been published on their performance following the ONDST.Aims...

ea0038p24 | Clinical biochemistry | SFEBES2015

Serum cortisol: what is your laboratory measuring?

Hawley James , Owen Laura , Monaghan Phillip , Armston Annie , Chadwick Carrie , Keevil Brian

Background: Accurate measurement of serum cortisol is essential in the investigation of the HPA axis. It has been documented that routine immunoassays are liable to both under- and over-recovery leading to inaccurate results and subsequent inappropriate investigations. This study seeks to provide an up-to-date assessment of the accuracy of the major immunoassay platforms and compares results to a liquid chromatography–tandem mass spectrometry (LC–MS/MS) candidate ref...

ea0077p55 | Metabolism, Obesity and Diabetes | SFEBES2021

A novel approach to serum multi-steroid profiling using ultra high-performance liquid chromatography-tandem mass spectrometry with post column infusion ammonium fluoride

Shaheen Fozia , Gilligan Lorna , Schiffer Lina , Storbeck Karl-Heinz , Hawley James , Keevil Brian , Arlt Wiebke , Taylor Angela

Comprehensive multi-steroid profiling offers a powerful tool for the investigation, diagnosis and management of steroidogenic disorders by simultaneously quantifying multiple steroids from several pathways of steroid biosynthesis and metabolism. Difficulties can arise when optimising chromatography and mass spectrometry conditions for many analytes in a single method. Low concentrations of ammonium fluoride have previously been shown to enhance the sensitivity of select analyt...

ea0081p27 | Adrenal and Cardiovascular Endocrinology | ECE2022

Multiplex serum steroid profiling using liquid chromatography mass spectrometry with post column infusion ammonium fluoride

Schiffer Lina , Shaheen Fozia , Gilligan Lorna , Storbeck Karl , Hawley James M , Keevil Brian , Arlt Wiebke , Taylor Angela

Background: Development of multi-steroid profiling allows comprehensive investigation into the different branches of steroid metabolism. Immunoassays only allow analysis of a single steroid per assay and suffer from problems with specificity due to cross reactivity of similar steroids. Liquid-chromatography mass spectrometry has the specificity to analyse multiple steroids in a single experiment and the dynamic range to quantify steroids at high concentrations such as those ob...

ea0081ep879 | Reproductive and Developmental Endocrinology | ECE2022

Daytime salivary androgen rhythm by LC-MS/MS in women affected by Polycystic Ovary Syndrome (PCOS) fulfilling the three Rotterdam diagnostic criteria

Fanelli Flaminia , Hawley James M , Mezzullo Marco , Fazzini Alessia , Zanotti Laura , Magagnoli Matteo , Pagotto Uberto , Keevil Brian , Gambineri Alessandra

Background: Excess testosterone in PCOS is accompanied by increased levels of other ovarian and adrenal androgens and precursors. Recently, 11-oxygenated adrenal androgens have been postulated as major components of the circulating androgen pool in PCOS. Obesity is strictly connected with androgen excess and with the derangement of hormone circadian rhythmicity. To date, it has not been clarified whether hyperandrogenism in PCOS, either complicated by obesity or not, is accomp...