A 15 ug/L cutoff is employed to rule out the likelihood of a positive result occurring from side-stream exposure.
Reference Intervals
All results less than 15 ug/L are reported as not detected. Results greater than 15 ug/L are resulted with a number and also a carboxy-THC to creatinine ratio.
Test Method
Alkalinised urine has a deuterated internal standard added, is neutralised and then analysed by LCMS.
Contact Canterbury Health Laboratories on +64 3 364 0484 or email LabInfo@cdhb.health.nz
Uncertainty of Measurement: 99% confidence limits at the cut-off are +/-4 ug/L.
