5. Which of the following disorders increases the production of erythropoietin hormone? (a) Anemia (b) Hypoxemia (c) Renal artery stenosis (d) All of the above
Too little erythropoietin could be due to anaemia (low red blood cells), especially anaemia due to kidney disease. Increased levels of erythropoietin might be due to a condition called polycythaemia (too many red blood cells) or it could be evidence of a kidney tumour.
