Non-invasive Measurement of Serum Haemoglobin in a Perioperative Setting

Knowledge of patients' serum haemoglobin (Hb) levels is of great importance in many areas of medical practice. Standard methods of measurement require direct blood sampling; they are therefore relatively invasive, costly, and time-consuming.

Non-invasive Hb measurement techniques utilizing a finger probe (SpHb) have attracted a lot of attention over the last five years. Numerous studies have compared the accuracy of these devices with central laboratory Hb data in a wide range of clinical settings: operating rooms, critical care units, emergency departments, and blood donor clinics.

A meta-analysis of previous studies regarding SpHb measurements in perioperative and intensive care settings has revealed a mean difference between non-invasive and central laboratory Hb results of 0.10±1.37 g/dl (n=4425) (2) . To date, however, few studies have assessed the use of these devices in a pre-operative setting.

Such a study could be of great value, as Hb measurement plays an important role in the implementation of PBM programmes (Patient Blood Management), which in turn are associated with improved patient outcomes, fewer transfusions and lower costs.

Various guidelines with the aim of reducing unnecessary testing have been proposed. Such guidelines prioritize the tests to be applied during preparation for minor, intermediate and major surgery, considering specific comorbidities.