Final answer:
Medical tests, including blood urea nitrogen, plasma creatinine and routine urinalysis, assess kidney function by measuring levels of substances such as creatinine, urine urea nitrogen, glucose, sodium, potassium, and other analytes in blood and urine.
Step-by-step explanation:
The tests that measure creatinine, urine urea nitrogen, glucose, sodium, potassium, and other analytes are primarily related to assessing kidney function and are therefore medical tests. Blood and urine tests, such as blood urea nitrogen (BUN), plasma creatinine, routine urinalysis, and 24-hour urine collection, are used to evaluate the excretion rates of these substances and hence the renal function. These tests can diagnose kidney diseases and monitor the effectiveness of treatments for renal dysfunction.
The creatinine clearance test, for example, is a standard measure for estimating glomerular filtration rate (GFR), which reflects how well your kidneys are filtering. Creatinine clearance is calculated using creatinine levels in both urine and blood, as well as urine flow rate, adjusting for body surface area to compare between different individuals. For accurate assessment of kidney function, it is important that these tests are carried out under standardized conditions following clinical guidelines.