Iodide, urine, normalised to creatinine
U- I KL 1984
​U- Krea KL 2145


Assessment of sufficient iodine intake


5 – 10 mL of morning urine that has been in the bladder for 3 – 4 hours.

Strong fluctuations in liquid balance compromise the reliability of the results. Avoid excessive or insufficient drinking prior to sampling. Avoid heavy physical exercise a few hours prior to sampling. Wash hands and external urethral orifice with water prior to sampling to avoid contamination.

Storage and delivery

Delivery at room temperature on sampling day (Mon-Wed). Can be stored refrigerated over the weekend. Store frozen when longer, ship frozen sample frozen.


Iodine assay: ICP-MS. The result is normalised to creatinine value (U-Krea, photometric) measured from the same urine sample.

Turnaround time 

10 weekdays

Reference ranges 

below 25 µg/g severe iodine deficiency
25 – 50 µg/g moderate deficiency
50 – 100 µg/g mild deficiency
over 100 µg/g sufficient intake of iodine

Iodine guidelines by WHO: World Health Organization. United Nations Children’s Fund & International Council for the Control of Iodine Deficiency Disorders. Assessment of iodine deficiency disorders and monitoring their elimination. 3rd ed. Geneva, Switzerland: WHO, 2007

U- Krea 

women 1.7 – 19.4 mmol/L
men 2.3 – 23.5 mmol/L​

Turnaround time

10 weekdays