Endocrine Abstracts

Background: The C-3 epimer of 25 Hydroxyvitamin D3 (3-Epi-25OHD3) is produced in the liver by the epimerisation pathway of 25-hydroxy vitamin D3. It differs from 25OHD3 in configuration of the hydroxyl group at the third carbon (C-3) position. Despite the fact that little is known regarding its clinical significance, concerns have been raised that isobaric interference may result in over-estimation of total 25OHD when measured by liq...

Background: Teriparatide PTH(1-34) is an osteoanabolic agent used in the treatment of osteoporosis. Measurement of PTH(1-34) can be useful in osteoporosis treatment and in the diagnosis of pseudohypoparathyroidism (PHP) by confirming administration of PTH(1-34)Aims: 1) To assess PTH(1-34) profiles obtained using standard Forsteo treatment compared to using a novel oral administration. 2) To confirm the PTH(1-34) in a PHP patient re...

Background: Teriparatide PTH(1-34) is an osteoanabolic agent used in the treatment of osteoporosis. Measurement of PTH(1-34) can be useful in osteoporosis treatment and in the diagnosis of pseudohypoparathyroidism (PHP) by confirming administration of PTH(1-34)Aims: 1) To assess PTH(1-34) profiles obtained using standard Forsteo treatment compared to using a novel oral administration. 2) To confirm the PTH(1-34) in a PHP patient re...

Introduction: The role of vitamin D and calcium metabolism has long been implicated in the clinical manifestation of primary hyperparathyroidism (PHPT). The skeletal response to the overproduction of PTH is less predictable, and the effect on bone loss can be greater in some patients. In this study, we established associations between vitamin D metabolism, vitamin D metabolite ratio (VMR) 1,25OH2D:24,25OH2D with rates of bone loss in PHPT patients who did not undergo surgery.<...

Objectives: Examine the effect of maternal Index of Multiple Deprivation (IMD) on newborn 25-hydroxyvitaminD (25OHD) levels in a multi-ethnic newborn cohort.Design: 3000 dried blood spots (DBS) were gathered from newborns at a regional newborn screening laboratory over two 1-week periods [February 2019 (winter) and August 2019 (summer)]. Data on birth weight, gestational age, maternal age, ethnicity, and post code were collected. Post code was replaced w...

Background: Volumetric absorbent microsampling (VAMS) provides a less intrusive alternative to venepuncture when collecting blood samples for diagnostic testing. A small, precisely determined amount of capillary blood from a single finger-prick is absorbed into a medium for storage, from which it can later be extracted and analysed. In this study, we developed methods to measure four commonly requested endocrine/bone biomarkers for finger-prick blood samples analysis, and inve...

Background: Melatonin and cortisol production demonstrate circadian rhythms; disruption of these rhythms feature in endocrine and neurodegenerative disorders, such as Addison’s disease, Huntington’s disease (HD) and Alzheimer’s disease (AD). Measuring serum and saliva concentrations at nadir is challenging using immunoassays. We have developed LC-MSMS methods for measuring serum and saliva melatonin, cortisol and cortisone to analyse 24hr profile samples obtained from sleep st...

A 33 year-old man was referred to the endocrine bone clinic following presentation with a 4 mm kidney stone and hypercalcaemia. Apart from mild fatigue, he had no other hypercalcaemic or concerning symptoms. He was not on any medications or supplements. He had a positive family history for kidney stones and reported that his grandmother had been noted to have hypercalcaemia in the past. There was significant consanguinity in his family. Examination was entirely normal while bl...

Introduction: In CKD, net effects of declining kidney function and increasing FGF23 (and PTH) concentrations on vitamin D catabolism and iron metabolism are not clear.Objectives: Compare the Biomedica to the Immutopics’ immunoassay for measurement of cFGF23. Determine the relationship between iron status; vitamin D and intact FGF23 (iFGF23) and c-terminal (cFGF23) concentrations in blood.Method: Samples from routine care and a...

Background: Zoledronate is a nitrogen-containing bisphosphonate (BP) recognised for its antiresorptive potency. The pharmacokinetic/pharmacodynamic of zoledronate remains unclear. Although adverse events from overuse of BP is rare, there have been reports of over-treatment resulting in pathophysiological consequences. The current administration regimen is not tailored to the individual’s therapeutic response to zoledronate. Quantifying post-dose serum con...