[Role of biorhythms in scatter of data of serial red blood cell tests in the preoperative period].

Serial preoperative tests carried out in 826 and 382 patients with primary total and revision hip arthroplasty, respectively, revealed a considerable data scatter in red blood cell values that exceeded instrumental errors. Thirty-day examinations of 7 healthy volunteers indicated the similar data scatter and the change fluctuations in the indices under study. The peripheral blood levels of erythrocytes (Er) and hemoglobin (Hb) fluctuated at hemicircaseptanic intervals and the mean content of hemoglobin (MCH) in the red blood cells did at circaseptanic intervals. There were fluctuations around the trend whose value changed with the circadiseptanic (Er and Hb) and circavigintanic (MCH) periods. It is suggested that these biorhythms are a cause in the observed data scatter.