A proposal for standardizing urine collections for bone resorption markers measurement.

Abstract:

:Diurnal variations in the excretion of bone resorption markers were assessed in order to identify the type of urine collection which provides the most information on bone resorption rate and its relation to measuring bone dynamics in a postmenopausal population. Sixty women, ages 43-67 and without disease or treatment known to affect bone mineral density, were divided into two groups on the basis of femoral mineral density T-score: <1.5 (Group I), >1.5 (Group II). Bone formation was assessed by measuring bone alkaline phosphatase activity and osteocalcin concentration, bone resorption by urinary hydroxyproline, pyridinoline and deoxypiridinoline, N-telopeptide, galactosyl hydroxylysine, and CrossLaps. To identify the more appropriate collection times, urine samples were collected from 7 am to 3 pm; from 3 pm to 11 pm; from 11 pm to 7 am. Twenty-four hour urine collection and first morning void urine samples were also measured. The findings suggest that nocturnal collection and first morning void samples provide the most reliable data on the rate of bone degradation, possibly showing bone loss not only in osteopenic patients but also in women with a low T-score. Nocturnal and first morning samples should therefore be recommended in order to standardize sample collection, as they enable an accurate assessment of bone resorption markers and improved comparability to results from different studies, as well as a less cumbersome collection modality.

journal_name

J Clin Lab Anal

authors

Zaninotto M,Bernardi D,Ujka F,Bonato P,Plebani M

doi

10.1002/(sici)1098-2825(1998)12:3<145::aid-jcla3>3

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

145-9

issue

3

eissn

0887-8013

issn

1098-2825

pii

10.1002/(SICI)1098-2825(1998)12:3<145::AID-JCLA3>3

journal_volume

12

pub_type

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