Kidney Function Test

Kidney Function tests

Kidneys are responsible to remove wastes and excess fluid and regulate the amount of water and salts in our bodies. It’s functioning can be evaluated through blood and urine tests. These tests are also known as renal function test.

Tests done in blood

Serum Creatinine

Creatinine is a waste product that comes from meat protein in the diet and through normal wear and tear of body muscles.Creatinine’s normal range is 0.6 to 1.2 mg/dl. Higher levels may be a sign that kidneys are not functioning properly. As the disease progresses, creatinine level in the blood increases giving rise to other complications. Apart from the diseased condition, creatinine levels may also vary according to a person’s muscle mass and body size.

Blood Urea Nitrogen (BUN)

Blood Urea Nitrogen (BUN) is another test to measure waste (urea) in the blood. Urea is produced due to the breakdown of food protein coming from diet. A high BUN generally means that kidney function is not up to the mark. There are other factors that may affect the BUN level like congestive heart failure, bleeding in the intestines and some medications may make the BUN higher than normal. Sometimes a low BUN may also depict that the person is not eating enough protein.

The normal range of BUN level is between 7 and 20 mg/dl. With the decrease in kidney function, the BUN level increases.

If the kidneys are not working properly, these substances may build up in the blood.

Tests done in urine

Creatinine Clearance

Creatinine clearance is a test done to estimate filtering capacity of the kidneys. The test compares a 24 hour sample of urine level of creatinine in urine with the creatinine level in the blood. This is especially relevant in patients with advanced kidney failure.

Createnine and BUN are also checked in urine.

A preventive health checkup including these tests gives a clear picture of your kidney’s functioning status. Do get it regularly done!