%0 Journal Article %A I. Cavill %T Quality control in routine haemoglobinometry %D 1971 %R 10.1136/jcp.24.8.701 %J Journal of Clinical Pathology %P 701-704 %V 24 %N 8 %X An analysis of haemoglobin estimations in a routine laboratory shows that quality control methods based on mean values are unsatisfactory. The use of a cusum method together with control samples is a sensitive and convenient technique for the early discovery of minor deviations in results and it is not dependent on a stable population of patients. %U https://jcp.bmj.com/content/jclinpath/24/8/701.full.pdf