What is the relationship between serum and urine in terms of detecting certain medical conditions?

Serum and urine are both bodily fluids that can be used to detect certain medical conditions. Serum is the clear liquid portion of blood that remains after blood has clotted, while urine is the liquid waste product excreted by the kidneys. Certain medical conditions can be detected by analyzing the levels of specific substances or markers in either serum or urine. For example, kidney function can be assessed by measuring levels of creatinine in both serum and urine. Additionally, certain diseases may cause specific substances to be present in either serum or urine, providing valuable diagnostic information.