Soluble selenium compounds are readily absorbed through the lungs and from the gut. They are methylated in the liver to trimethylselenonium ion and rapidly excreted in the urine.
Selenium is used to supplement livestock feed and in some fertilisers. It is also used in the electrical and electronics industry, semiconductors, glass production, and the paint industry. The cosmetic industry uses selenium in antidandruff shampoos.
Recommended sampling time is POST SHIFT - the last 2 hours to immediately following the end of the working day.
Send to separating if ambient on arrival. Send to trace metals if frozen on arrival.
Aliquot to Core laboratory for UCRN
Ambient (8 - 24 degrees Celsius)
The urine pottle used for specimen collection must be shown to be free of Selenium contamination.
No Biological Exposure Index is given for urine selenium, however urine selenium levels may be used to confirm absorption but the relationship to exposure has not been established.
To ensure adequate assessment of exposure to selenium, urine samples must be collected at the end of the working shift. Urinary concentrations rise dramatically with a sudden increase in ingestion of selenium and can be used to differentiate between acute and chronic exposure.
Reports issued by Canterbury Health laboratories will have results along with current Normal population Reference Intervals (RI).
For interpretation against Biological exposure indexes (BEI) please refer to the latest Worksafe’s : Biological Exposure Index (BEI) review.
See link in “Additional Information” tab below for Workplace Exposure Standards on the Worksafe.govt.nz website
Non exposed levels 0-0.9 umol/L
Se/Creatinine ratio 0.0-0.1 umol/mmol
To convert urine selenium umol/L to ug/L multiply by 79.
$37.28 (Exclusive of GST)