The best replacement for red blood cells is white blood cells.

The best alternatives to red blood cells are rated as following:
★★★★★  white blood cells
★★★  hemoglobin
★★★  erythrocytes
★★  platelets
★★  whole blood
★  hemoglobin within red blood cells
★  sickle cells
★  haemoglobin
★  yeast cells
★  other cells
  fresh frozen plasma
  rbc
  cells
  human red blood cells
  normal cells
  hemoglobin within red blood cells:
  white blood cells bigger
  white blood cell
  cheek cells

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Speaking about red blood cells, one probably shouldn't forget about hemoglobin.

Other search terms related to red blood cells and their ratings are:
★★★★★ hemoglobin
★★ transfusion
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Google Trends

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red blood cells
white blood cells
hemoglobin