high hematocrit levels indicatehemoglobin and hematocrit levels highpolycythemia hematocrit levelsslightly elevated hematocritelevated hemoglobin and hematocritelevated hematocrit dehydrationelevated hct levelselevated rbc and hematocritcauses of increased hematocrithigh hemoglobin hematocritlow hemoglobin high hematocritincreased hemoglobin and hematocrit