elevated rdw and low mcvlow hemoglobin low hematocrit low mcvlow mcv low mch high rdwmcv mch mchc lowhigh mcv low mchc blood testlow mcv mch mchc high rdwlow mcv mch mchc high rbcrdw cv low what does it meanlow hemoglobin hematocrit mcv mch mchclow hgb high rdwhigh rdw and low mchhgb hct mcv mch low