Your kidneys help maintain blood pressure, keep the blood's acid-base level within a healthy range, and filter the blood so nutrients are absorbed and waste is passed out of the body as urine. Your kidney function reflects how well your kidneys are filtering your blood. Abnormal kidney function could result in the accumulation of waste products in the body, which can cause fatigue, headaches, nausea, and more.
Blood urea nitrogen (BUN)
Optimal range: 7 - 20 mg/dL
Urea nitrogen is a waste product formed in our bodies and is filtered out of the blood and into urine by our kidneys. While low levels are not indicative of a problem, unusually high levels always point toward kidney dysfunction.
Optimal range: 0.51 - 0.95 mg/dL
Creatinine is formed by the breakdown of creatine, a key molecule in muscular metabolism. Our kidneys are responsible for removing creatinine from the blood and expelling it in urine. Therefore, blood creatinine levels are a good indicator of how well the kidneys are working.
Estimated Glomerular Filtration Rate
Optimal range: 60 - 120 mL/min per 1.73 m2
eGFR stands for estimated glomerular filtration rate. Your eGFR score is a reflection of your blood test for creatinine, a waste product formed in muscular metabolism. It estimates how well your kidneys are working.
Optimal range: 3.4 - 7.2 mg/dL
Uric acid is a natural byproduct formed during the breakdown of our body’s cells and the food that we eat. Excess uric acid can be caused by either an overproduction of uric acid or inefficient removal of it from the blood. The most common affliction associated with excess uric acid is gout, a painful form of arthritis.