What tests are done to check kidney function?
Because our kidneys are essential in filtering wastes and excess fluids from the body, maintaining fluid balance, and regulating electrolyte levels, their function is vital to overall health. Therefore, regular testing to determine renal function is necessary to diagnose kidney disease and monitor its progression once diagnosed.
This post will explore, in detail, the various tests used in checking and monitoring kidney function, including blood tests, urine tests, imaging, and even how to check kidney function at home.
Blood tests
A blood test for kidney function is perhaps the most common test, providing valuable information about the level of waste products in the blood, such as creatinine and blood urea nitrogen (BUN). The kidneys are responsible for filtering these waste products, and when they are not functioning correctly, the levels of these waste products can increase in the bloodstream.
Creatinine blood tests
Creatinine is a waste product the muscles produce and excrete through the kidneys. A blood test can measure the creatinine level in the blood to calculate the glomerular filtration rate (GFR). The GFR measures how well the kidneys filter waste from the blood. A decrease in GFR can indicate kidney dysfunction.
What level of creatinine indicates kidney failure?
The level of creatinine that indicates kidney failure can vary depending on several factors, including age, gender, muscle mass, and underlying health conditions.
In general, creatinine levels can roughly estimate kidney function. An eGFR test for creatinine will also consider other factors such as age, gender, and race.
According to the National Kidney Foundation, an eGFR of less than 15 mL/min/1.73 m² indicates kidney failure. However, this is just a general guideline, and individual cases may vary. Therefore, it is essential to consult with a healthcare provider to determine each individual's creatinine level.
BUN blood tests
BUN is a waste product produced by the liver and excreted through the kidneys. A blood test can measure the level of BUN in the blood, and an increase in BUN can indicate kidney dysfunction.
What level of bun indicates kidney failure?
Like creatinine, the level of BUN that indicates kidney failure can vary depending on several factors, including age, gender, muscle mass, and underlying health conditions.
Generally, a BUN level greater than 60 mg/dL may indicate kidney failure. However, this is just a general guideline, and individual cases may vary.
Testing for electrolytes
A kidney blood test will also check your body's electrolyte levels.
Electrolytes, such as sodium, potassium, and chloride, are essential for proper body function and are regulated by the kidneys. Therefore, abnormal levels of electrolytes in the blood can also indicate kidney dysfunction.
Urine tests
Urine tests are another standard method used to check kidney function, as they can provide information about the presence of various substances in the urine that may indicate kidney disease or dysfunction. Urine tests can help detect the presence of protein, blood, and other substances in the urine that can indicate kidney problems.
One important urine test is the albumin-to-creatinine ratio (UACR) test. This test measures the amount of albumin, a type of protein, in the urine in relation to the level of creatinine in the urine. An increase in the UACR can indicate early kidney damage, even before changes in the blood test results or symptoms of kidney disease are present.
Other urine tests can test for the presence of red or white blood cells, which can indicate inflammation or infection in the kidneys or urinary tract. In addition, urine tests can help detect abnormal cells, crystals, or other substances in the urine that may indicate kidney stones or other problems with the urinary tract.
Overall, urine tests are a helpful tool for checking kidney function. They can provide valuable information about substances indicating kidney or urinary tract problems.
Imaging tests
Imaging tests can provide information about the size, shape, and structure of the kidneys and any abnormalities or obstructions in the urinary tract.
Several types of imaging tests can be used to check kidney function:
Ultrasound: Ultrasound uses high-frequency sound waves to produce images of the kidneys and urinary tract to detect abnormalities, such as cysts or tumors.
CT scan: A CT scan uses X-rays and computer technology to produce detailed images of the kidneys and urinary tract to help identify obstructions and abnormalities.
MRI: An MRI uses a magnetic field and radio waves to produce images of the kidneys and urinary tract. In addition to providing size, shape, and structural information, an MRI can also detect abnormalities or obstructions.
Renal scintigraphy: Renal scintigraphy uses a small amount of radioactive material to produce images of the kidneys and urinary tract. This test provides detailed information about kidney function and can help to identify any blockages or obstructions in the urinary tract.
By combining the results of imaging tests with blood and urine tests, healthcare providers can get a comprehensive picture of your overall kidney function and identify potential problems early on.
At home testing
Reset Kidney Health has partnered with Healthy.io to offer a convenient kidney test that allows you to test your kidney health from the comfort of your home. The test is free, easy, and can be completed in minutes.
Here's how it works:
Take a test to assess your risk: You'll be asked to answer a few questions about your health and family history, and based on that information, we will evaluate your risk for kidney disease.
Get your at-home test kit: If you are at high risk, we'll give you the option to order a free at-home smartphone test kit.
Complete the test: A urine test will detect kidney damage in just a few minutes.
Start your treatment: If kidney disease is detected, a care team member will reach out to begin your treatment.
This test offers several benefits over traditional tests for kidney function. First, it can be done from home, saving you a trip to the lab. Second, it's easy to do and only takes a few minutes. Third, you get instant, clinical-grade results.
Most importantly, the test is FDA-cleared, accurate, and safe, just like a lab test.
Get your at-home kidney test today.
If you are at risk of kidney disease, you must regularly test your kidney function to ensure good kidney health. The team at Reset Kidney Health knows from experience that early treatment for kidney disease saves lives. With Reset, you can get testing and care from the comfort of your home. We are currently accepting new patients. Contact us today to speak with a member of our care team.
