The accuracy of the Hemocue, a portable haemoglobinometer, was tested on 29 patients undergoing open-heart surgery, and the results were compared with the haemoglobin values obtained from the hospital laboratory. Special attention was paid to the lower range of haemoglobin values and the simplicity and speed of operating the meter. The correlation between the methods was good (r = 0.965). The limits of agreement were 0.0323 +/- 0.705 mmol l-1 (95% confidence level).
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