This study's goal is to establish SpHb threshold values that can help health care provider sort out which patients would potentially benefit from central laboratory Hb testing pre-operatively and who would likely not. It also aims to compare the mean difference between these two methods in a pre-operative setting. SpHb values will be observed and recorded from patients meeting the inclusion criteria undergoing pre-operative evaluation for plastic, trauma, orthopaedic, urological, general and gynaecological surgery over one year by the Department of Anaesthesiology and Intensive Care Medicine at the University Medical Centre Graz. All patients will be evaluated pre-operatively by an anaesthesiologist, utilizing both central laboratory measurements as clinical routine and non-invasive Hb measurements. Both measurements (SpHb and central laboratory Hb) will be documented, along with the normally collected patient data, using the electronic system currently in use. Median values from the two methods will be compared, and possible cut-off values calculated.
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SpHb Accuracy
Timeframe: before surgery
SpHb Cut-off
Timeframe: before surgery