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The interesting clinical range is 11 to 50 mg/dL and the assay concordance was established only above it. Before a unit builds a protocol around sub-threshold haemolysis it must know its own assay's performance in that band — a written question for the laboratory, not the perfusion team.
Established laboratory methods
Baud B, Dupuy AM, Zozor S, Badiou S, Bargnoux AS, Mathieu O, Cristol JP. Bioanalysis 2023;16(2):65-74. DOI 10.4155/bio-2023-0116
Point-of-care plasma free haemoglobin measurement
Analytical study, not a clinical outcome study; device-specific
Within-run imprecision under 3 percent, with acceptable concordance with laboratory methods established FROM 50 mg/dL upward. Agreement below the ELSO threshold was not established.
Method-comparison study of a point-of-care free haemoglobin device against laboratory reference methods