The nurse is administering SUBQ enoxaparin to a client following knee replacement surgery to prevent a deep vein thrombosis. Which laboratory result requires immediate action by the nurse? Reference Range: Hematocrit [42% to 52% (0.42 to 0.52 volume fraction)] Platelets [150,000 to 400,000/mm3 (150 to 400 x 10^9/L)] Creatinine [0.5 to 1.1 mg/dL (44 to 97 μmol/L)] Blood Urea Nitrogen (BUN) [10 to 20 mg/dL (3.6 to 7.1 mmol/L)]

A. A platelet count of 100,000/mm3 indicates thrombocytopenia, which increases the risk of bleeding with enoxaparin and requires immediate action. B. A serum creatinine level of 1.0 mg/dL is within the normal range and does not require immediate action. C. A BUN level of 20 mg/dL is at the upper end of the normal range but does not typically require immediate action unless accompanied by other symptoms. D. A hematocrit level of 45% is within the normal range and does not require immediate action.