WS/T 669-2020 in English

VALID

Definition and demarcation of iodine deficient areas and iodine adequate areas

Issued on:2020-03-16
Implemented on:2020-07-01
File Format:PDF
Delivery:Via email within 1~3 business days

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Standard No:	WS/T 669-2020
Document status:	VALID
Title in English:	Definition and demarcation of iodine deficient areas and iodine adequate areas
Title in Chinese:	碘缺乏地区和适碘地区的划定
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-03-16
Implemented on:	2020-07-01
ICS Classification:	11.020-Medical Sciences and health care facilities in general
Chinese Classification:	C61-Diagnostic standard for public nuisance diseases
Professional Classification:	WS-Hygiene
Related Keywords:	iodine-deficient areas sufficient iodine areas iodine deficient areas iodine adequate areas introduction analysis median water iodine median urine iodine
Related Topics:	iodine area iodine regional plan ws/t 107.1 ws t 107.1 iodine handling Iodine temperature zone human iodine Lack of standards lack iodine handling suitable box exhaustion iron deficiency Regional total nitrogen Draw regional model Process iodine Iodine content in various places Total phosphorus area Iodine content in various places iodine enzyme deficiency iodine rush to buy cedar iodine District 1 and District 2 www.youji District 1 and District 2 iodide place Lack of unified industry

本标准规定了碘缺乏地区和适碘地区的划定指标和方法。
本标准适用于碘缺乏地区和适碘地区的划定。

Introduction

Analysis of the core content of the standard

This standard innovatively proposes a dual-indicator judgment system of median water iodine and median urine iodine:

Judgment dimensions	Iodine-deficient areas	Sufficient iodine areas
Median water iodine (μg/L)	<40	40-100
Median urine iodine for children aged 8-10 years old (μg/L)	<100	100-300
Thyroid enlargement rate	-	≤5%

Technical evolution analysis

Major breakthroughs compared with previous standards:

For the first time, the quantitative standard of iodine-sufficient areas was clarified
The requirement of peripheral water testing was introduced
Differentiated judgment rules under the influence of iodine supplementation measures were established

Implementation points

Example of sampling specification: A certain administrative village needs to test 15 wells, and 1-2 wells (10% ratio) are selected from the east, south, west, north and center, and 1 water sample is collected from each well; children's urine samples must ensure that half male and half female and the sample size is ≥50.

Recommendations for standard application

Preferably use inductively coupled plasma mass spectrometry (WS/T 107.2) to improve detection accuracy
Water iodine detection should avoid the influence of extreme values in the flood/dry season
Thyroid diagnosis needs to be combined with ultrasound measurement (WS 276)

More samples: JGJ 94-2008 QC/T 942-2021 JJG 21-2008

Sample only — not a preview of WS/T 669-2020

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