A client with severe аnemiа repоrts symptоms оf tаchycardia, palpitations, exertional dyspnea, cool extremities and dizziness with ambulation. Laboratory test results reveal a hemoglogin of 8 g/dL and a hematocrit of 24%. Based on the data, which nursing diagnosis is the priority for this client? (Normal value ranges: hemoglobin - female 12-16 g/dL/ male 14-18 g/dL, hematocrit - female 37-47%/ male 42-52%)