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. 2023 Jun 2;37(6):1441–1449. doi: 10.1007/s10877-023-01031-3

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — IVCS concordance data for three oximeters at Hct = 40 (normocythemia). The ability of pulse oximeters to accurately measure SpO₂ in an in vitro system was compared to the human calibration data at normocythemia (Hct = 40%). In vitro measurements on IVCS do not exactly match invasive measurements on a reference device, indicated by deviation from the line of identity. Note however, the concordance of the benchtop and handheld oximeters compared to the fingertip device