A 45-year-old patient with a history of chronic renal failure reports feeling so fatigued that he cannot work a full day at his job. The nurse would anticipate testing for levels of which substance most likely implicated in these findings?
1. Testosterone
2. Growth hormone
3. Erythropoietin
4. Magnesium
3
Rationale 1: As this patient has a history of chronic renal disease, a different substance is likely implicated in this complaint.
Rationale 2: Growth hormone may be implicated to some degree in this finding, but it is not the most likely causative factor.
Rationale 3: Erythropoietin is a hormone produced in the kidney that stimulates the production of red blood cells. Being fatigued may indicate that there are not enough red cells to transport oxygen to the tissues.
Rationale 4: Magnesium is involved in production of RBCs, but this is not the most likely imbalance in this patient's condition.
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