Final answer:
Creatinine is a laboratory test used to assess kidney function by measuring the levels of creatinine in the blood and calculating the creatinine clearance. It helps determine the glomerular filtration rate (GFR), an essential indicator of kidney health. Other tests like HDL, FBS, and ALT are not indicators of kidney function.
Step-by-step explanation:
The laboratory test for kidney function that is listed among the options is A. Creatinine. This substance is produced by the body and is freely filtered by the glomerulus in the kidneys. The measurement of creatinine levels in the blood can be used to assess renal function, particularly the glomerular filtration rate (GFR), which is an indicator of kidney health and function. Creatinine clearance tests are also performed which involve measuring the concentration of creatinine in both urine and plasma and can further assess renal function.
Tests like HDL (high density lipoprotein) are not used to assess kidney function; instead, they are related to cholesterol and cardiovascular health. The FBS (fasting blood sugar) is related to glucose levels and is a test for diabetes, not directly related to kidney function. The ALT (alanine aminotransferase) is an enzyme typically measured to assess liver function, not kidney function.
Therefore, the correct answer for the test that is used to check for kidney function is A. Creatinine.