PO-0079Urinary N-telopeptide Levels Are Not Associated With Vitamin D Status In Healthy Children

• Published in: Archives of disease in childhood Vol. 99; no. Suppl 2; p. A275
• Main Authors: Stoian, CA, Mah, J K, Chin, A C, Khan, A
• Format: Journal Article
• Language: English
• Published: 01.10.2014
• ISSN: 0003-9888
• DOI: 10.1136/archdischild-2014-307384.749

Background and aimsUrinary levels of N-telopeptide (NTx) have been reported to be a sensitive and specific marker of bone resorption. This cross-sectional study determined the urinary levels of NTx among healthy children living in Calgary and explored their relationship with age, sex and vitamin D status.MethodsWe included healthy children 2 to 13 years of age who presented to the Alberta Children's Hospital for elective surgery during a 12-month period. Data including the child's weight, height, age, gender, ethnicity, dietary intake, vitamin intake, and physical activity were collected. Urinary NTx levels were measured with a commercially (Wampole Laboratories, Princeton) available competitive-inhibition enzyme-linked immunosorbent assay.ResultsUrinary NTx levels were available for 968 out of 1862 participants, of whom 605 (62.5%) were boys. The mean urinary NTx/Creatinine ratio was 605.4 nmol/mmol (SD 264.8, range 200-2985.1). We found that mean urinary NTx/creatinine excretion was higher in the younger children (2-5 years) compared to subsequent ages. There was no significant difference in urinary NTx levels between children with suboptimal vitamin D status (serum 25-hydroxyvitamin D <80 nmol/L) compared to those with optimal vitamin D status.ConclusionsHigher urinary NTx levels were measured in our healthy paediatric participants compared to what has been reported in healthy adults. In healthy children, urinary NTx levels may not be a useful marker of increased bone turnover in face of suboptimal vitamin D status. Future research is needed to determine the effect of suboptimal vitamin D status on bone health in children.