Central cyanosis is an important clinical sign because it indicates the presence of appreciable arterial hypoxaemia. According to classical textbook teaching, concentrations of deoxyhaemoglobin of about 5 g/dl are necessary before central cyanosis is clinically detectable. This figure has recently been questioned and thought to be a considerable overestimation. The aim of this study was to re-examine the relationship between deoxyhaemoglobin concentration and central cyanosis and to determine the minimum deoxy- haemoglobin concentration required for the detection of central cyanosis.
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Goss et al. (1988) studied this question.
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