In our laboratory the correction of urine results for SG went out with the arc.
We report the urine lead and the urine creatinine. For some metals we also report the metal/creatinine as a mole ratio. This is paticularly useful when comparing pre-shift and post-shift levels. At one facility the workers are in a confined space and cannot drink so they become dehydrated during the shift and the concentration of the urine is always higher. Comparason of the creatinine ratio is more meaningful than the concentration.
However we do refer urine cobalt on to another laboratory and our bone of contention is that they report the result corrected to an sg of 1.024 but do not report the raw result or the SG of the urine. I find it ironic that they use an ICP-MS costing NZ$500,000 and then correct the result for SG. Another potential problem with the SG correction is if the referring laboratory then correct the result for SG again.
We find it more acceptable to report the result that was measured.
"We tortured the data until it confessed."
Trevor Walmsley, Canterbury Health Labs, Christchurch, New Zealand.
Phone: (0064 3) 364 0326 Fax:Phone: (0064 3) 364 0320
eMail: [log in to unmask]
Internet: http://www.cdhb.govt.nz/chlabs/staff/trevorw.htm
>>> Bruce Campbell <[log in to unmask]> 28/11/01 2:14 pm >>>
Baselt's book on biological monitoring of industrial chemicals suggests
that inorganic lead in urine is the best choice for monitoring
tetraethylead exposure. He suggests that urine lead be measured and
corrected to a specific gravity of 1.024. We don't measure urine S.G. Can
anyone direct me to a conversion factor or table between urine specific
gravity and urine creatinine concentration?
****************************************
Bruce Campbell FRCPA FAACB
Sullivan Nicolaides Pathology
Ph 61 (0)7 3377 8672
Fax 61 (0)7 3870 5989
Email [log in to unmask]
****************************************
**********Confidentiality/Limited Liability Statement***************
This message and any files transmitted with it contain privileged and
confidential information intended only for the use of the addressee
named above. If you are not the intended recipient of this message,
you must not disseminate, copy or take any action in reliance on it.
If you have received this message in error, please notify Sullivan
Nicolaides Pathology immediately.
Any views expressed in this message are those of the individual sender
and Sullivan Nicolaides Pathology accepts no liability for the content
of this message except where the sender specifically states them to be
the views of Sullivan Nicolaides Pathology.
** This email and attachments have been scanned for content and viruses
and is believed to be clean **
This email or attachments may contain confidential or legally
privileged information intended for the sole use of the addressee(s).
Any use, redistribution, disclosure, or reproduction of this message,
except as intended, is prohibited. If you received this email in error,
please notify the sender and remove all copies of the message,
including any attachments. Any views or opinions expressed in this
email (unless otherwise stated) may not represent those of Canterbury
District Health Board.
|