the authors determined mean day-to-day ( daily over five days ) , mean week-to-week ( weekly over five weeks ) and mean hour-to-hour ( 800 h , 1100 h , 1400 h ) physiologic intra-individual variation of concentration values of leukocyte cell types , platelet count , and erythrocyte values ( hematocrit , hemoglobin ) for a group of 20 healthy adult volunteers .
C0014792
erythrocyte
C0019046
hemoglobin