Usefulness of iodine/creatinine ratio from spot-urine samples to evaluate the effectiveness of low-iodine diet preparation for radioiodine therapy.

Abstract:

OBJECTIVE:The success of a low-iodine diet (LID) is best determined by measurement of 24-h urine iodine (U-I) excretion. The aim of this study was to determine reliable estimates for 24-h U-I based on spot-urine samples and to provide cut-offs to determine the effectiveness of LID preparation. DESIGN:We prospectively measured iodine levels in 193 patients based on 24-h- and spot-urine samples before radioactive iodine therapy. The iodine was expressed as the 24-h U-I excretion (microg/day) and as two different indices from spot urine, simple iodine concentration (simple I) and the iodine/creatinine (I/Cr) ratio. Poor LID preparation was defined as I excretion of >150 microg/day according to the 24-h U-I measurement. RESULTS:The measured 24-h U-I was significantly higher than the two indices from spot urine (P < 0.001). However, there were statistically significant correlations between the 24-h U-I values and the two spot-urine-based indices; the correlation coefficient was 0.539 for simple I and 0.773 for I/Cr ratio (P < 0.001). The cut-off of I/Cr ratio for poor LID preparation was >66.2 microg/g Cr (sensitivity 96.4%, specificity 83.6%, positive predictive value 50.0% and negative predictive value 99.3%). CONCLUSIONS:We demonstrated that the I/Cr ratio from spot urine could serve as a useful and reliable alternative to 24-h urine collection as it has acceptable diagnostic values for detecting poor LID preparation.

journal_name

Clin Endocrinol (Oxf)

journal_title

Clinical endocrinology

authors

Kim HK,Lee SY,Lee JI,Jang HW,Kim SK,Chung HS,Tan AH,Hur KY,Kim JH,Chung JH,Kim SW

doi

10.1111/j.1365-2265.2009.03774.x

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

114-8

issue

1

eissn

0300-0664

issn

1365-2265

pii

CEN3774

journal_volume

73

pub_type

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