Improved non-invasive total haemoglobin measurements after in-vivo adjustment

R. Miyashita, N. Hirata, S. Sugino, M. Mimura, M. Yamakage

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We hypothesised that an in-vivo adjustment method and/or a newer sensor would increase the accuracy of non-invasive and continuous haemoglobin monitoring (SpHb) measurements. Two sensors, the R1-25 and R2-25a (the newer version), were used with laboratory total haemoglobin concentration (tHb) values simultaneously recorded. In-vivo adjusted SpHb (AdHb) was calculated by a simple formula: AdHb = SpHb - (1st SpHb - 1st tHb). The correlation coefficients between SpHb (or AdHb) and tHb were compared: SpHb in both sensors correlated strongly with tHb (p < 0.0001). In-vivo adjustment improved the correlation coefficient between SpHb and tHb from 0.86 to 0.95 for the R1-25 and from 0.83 to 0.93 for the R2-25a. There was no difference between the R1-25 and R2-25a sensors. The in vivo adjustment method improved the accuracy of SpHb measurements in both sensors.

Original languageEnglish
Pages (from-to)752-756
Number of pages5
Issue number7
Publication statusPublished - 2014 Jul


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