What is a common physiological effect detected through blood tests?

Liver enzymes levels are a common physiological effect detected through blood tests because they provide critical information regarding liver function and health. When the liver is damaged or diseased, it releases specific enzymes into the bloodstream, leading to elevated levels that can be measured through a simple blood test. The measurement of liver enzymes, such as alanine transaminase (ALT) and aspartate transaminase (AST), can help diagnose liver conditions like hepatitis, fatty liver disease, and cirrhosis, as well as monitor the progression of these diseases or the effectiveness of treatments.

Other options might relate to health and physiological status, but they do not provide the same level of insight through standard blood testing. While the presence of bacteria can be detected in blood tests, it is more about infection rather than a physiological effect and is less common as a general measure related to routine health checks. The patient's weight and skin hydration levels are typically assessed through physical examination rather than blood tests, making liver enzyme levels a key focus for evaluating physiological health through laboratory analysis.