We conducted such a comparison many years ago, and the most relevant finding was that technologists mixed the samples much more thoroughly when they knew that the hemoglobin result was being recorded.
Regards, Bob
Robert Murray, Ph.D.
Technical Consultant, Midwest Diagnostic Pathology
Lutheran General Hospital
Park Ridge, IL 60068 U.S.A.
847-723-6174
________________________________________
From: Clinical biochemistry discussion list [[log in to unmask]] On Behalf Of Trevor Walmsley [[log in to unmask]]
Sent: Saturday, September 18, 2010 1:04 AM
To: [log in to unmask]
Subject: Re: Measured vs Calculated Haemoglobin
Hi Tim
I would have thought the only way to resolve this issue would be to compare haemoglobin levels from the portable blood gas analyser against your laboratories haemoglobin measurements. After all what is a measured haemotocrit apart from the classical method which involves high speed centrifugation of the whole blood and measurement of the ratio of packed red cell expressed as a fraction of the initial volume of blood.
cheers
Trevor
"Come on Manchester get in behind global warming and grow your own bananas"
Trevor Walmsley,
Senior Scientific Officer (www.hospitalscientists.org.nz)
Canterbury Health Labs, Christchurch, New Zealand.
Phone: (0064 3) 364 0326 Fax:Phone: (0064 3) 364 0320
eMail: [log in to unmask]
Internet: www.cdhb.govt.nz/chlabs/staff/trevorw.htm
________________________________
From: Clinical biochemistry discussion list on behalf of Hogan, Tim
Sent: Sat 18/09/2010 4:08 a.m.
To: [log in to unmask]
Subject: Measured vs Calculated Haemoglobin
We are looking at portable blood gas analysers for use in the community, most of the smaller ones which use disposable cartridges measure haematocrit and calculate haemoglobin. What are the errors or asumptions in the calculation of haemogobin using measured haematocrit, and are they clinically relevant when applied to further calculated parameters such as oxygen saturation.
Tim.
Tim Hogan
Laboratory Manager
Clinical Biochemistry
Basildon and Thurrock University Hospitals
NHS Foundation Trust
0845 155 3111 Ext 3036
[log in to unmask]
www.basildonandthurrock.nhs.uk<http://www.basildonandthurrock.nhs.uk/>
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