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Kidney Function Evaluation & Testing

The first time you visit Florida Kidney Physicians, you may undergo a thorough evaluation and testing of kidney functions. Our physicians will take time to get to know you and will explain all of the tests that are necessary to make a prompt diagnosis so that treatment may begin.

Your evaluation will include:

  • Complete health history and exam
  • Discussion of current lifestyle and habits
  • Blood tests
    • Blood urea nitrogen (BUN) test: Measures the amount of nitrogen in your blood that comes from the waste product urea. Helps determine kidney function.
    • Serum creatinine: Creatinine is a waste product that comes from muscle activity. When the kidneys are working well, they remove creatinine from the blood. This test is an index used to determine how the kidneys are presently filtering blood. As kidney function weakens, the level of creatinine in the blood increases.
    • Estimated glomerular filtration rate (GFR) screening:  A trending test that measures kidney function over time, or how well your kidneys are filtering blood. Your nephrologist looks at the average reading to make a determination.
  • Urinalysis
    • Includes examination of white and red blood cells in urine
    • Proteinuria (protein in the urine) screening and management: Index that predicts future kidney function. Proteinuria means that CKD is present.
  • Other tests as necessary depending on each particular patient case

Stages of Chronic Kidney Disease (CKD) 

The stages of CKD are determined by the glomerular filtration rate (GFR), or percent of kidney function you have. Glomerular filtration is the process by which the kidneys filter the blood, removing excess wastes and fluids. Chronic kidney disease is defined as either kidney damage or GFR of less than 60 for longer than 3 months. Treatment and lifestyle changes can help slow or stop the progression of kidney disease.

pressure.
Stage Description GFR Symptoms
1 Kidney damage (proteinuria) is present although the kidneys function normally > = 90% There are usually no symptoms present. If CKD is detected at this stage, it’s typically because the patient was tested for diabetes or high blood pressure.
2 Mild loss of kidney function 60-89% There are usually no symptoms present. If CKD is detected at this stage, it’s typically because the patient was tested for diabetes or high blood
3A Mild to moderate loss of kidney function 45-59% Fatigue
Fluid retention; swelling in ankles and around the eyes
Shortness of breath from fluid in lungs
Changes in color of urine (dark orange, brown, or red)
Frequent urination at night
Changes in appetite
Back pain
Sleep problems due to muscle cramps or restless legs
3B Moderate to severe loss of kidney function 30-44% Same as stage 3A
4 Severe loss of kidney function 15-29% Fatigue and weakness
Swelling, especially around the eyes and ankles
Anemia
Bleeds and bruises easily
Loss of appetite
Nausea or vomiting
Headaches
Difficulty concentrating
Dry, itchy skin
Making little or no urine
Muscle cramps
Numbness in hands or feet
Changes in skin color
5 Kidney failure; end-stage kidney disease < 15% Same as stage 4

For expert evaluation and diagnosis of kidney disorders, call Florida Kidney Physicians at (813) 910-0030 or request an appointment online. We see patients in Tampa, Temple Terrace, Wesley Chapel, Brandon, Lutz, Plant City, and Sun City Center, Florida.

Florida Kidney Physicians - Kidney Disease - Hypertension - Nephrologists in the Tampa Bay Area - Nephrology - High Blood Pressure - Kidney - Kidney Transplant