WABO blood group system
WAnemia
WCarcinocythemia
WCritical green inclusion
WDiff-Quik
WAnemia
WHypersegmented neutrophil
WIatrogenic anemia
WJordans' anomaly
WLeft shift (medicine)
WMegaloblastic anemia
WPerls Prussian blue
WVitamin B12 deficiency anemia
WPolycythemia
WPolycythemia vera
WProgressive transformation of germinal centres
WReactive lymphocyte
WRomanowsky stain
WSickle cell disease
WSPRED1
WT cell deficiency
WThrombocytopenia
WToxic vacuolation
WWhite blood cell differential