Final answer:
The lab test that shows fluid volume overload or hypervolemia is the Brain natriuretic peptide (BNP) test. This test measures the levels of BNP, a hormone produced by the heart. Higher levels of BNP indicate hypervolemia.
Step-by-step explanation:
The lab test that shows fluid volume overload or hypervolemia is the Brain natriuretic peptide (BNP) test. This test measures the levels of BNP, a hormone produced by the heart in response to increased fluid volume and pressure. Higher levels of BNP indicate hypervolemia, which is commonly seen in conditions like heart failure, liver cirrhosis, and kidney disease.