Ordering the Kidney Function Test
The Kidney Function Test helps check how well your kidneys are working by measuring different substances in your blood, such as creatinine, urea, and electrolytes. This test can show early changes in kidney performance, even before symptoms appear. Interestingly, some people with mild kidney changes may not notice any signs, but the test can still detect these changes, allowing for earlier action.
Ordering this test can help you:
- Track changes in kidney performance over time
- Monitor the effects of medications that may impact kidney function
- Detect early signs of kidney stress or damage
- Check for imbalances in minerals like sodium and potassium
- Support decisions about diet or treatment plans based on kidney status
Who Should Consider Kidney Health Screening
People who have a family member with kidney problems, or who have conditions like diabetes or high blood pressure, may benefit from this test. For example, someone who recently started a new medication for high blood pressure might want to check if their kidneys are handling the change well.
Ordering this test may also be helpful in these situations:
- Someone with swelling in their legs or ankles
- A person with a history of frequent urinary tract infections
- Someone who has noticed changes in how often they urinate
- A person with a long-term condition like diabetes or heart disease
- Someone who has been exposed to heavy metals at work, as these can affect kidney function
This test gives clear numbers that show how well your kidneys are filtering waste and balancing minerals. Delaying this test could mean missing early changes that are easier to manage if found sooner, which can help avoid more complicated problems later.
Preparing for Renal Panel Testing
Fasting for 10-12 hours is needed before your blood is drawn for this test, so plan your appointment accordingly. Always follow any directions your doctor or healthcare provider gives you to make sure your results are as helpful as possible.
Labs Included When Ordering Your Kidney Function Test
| Test Name | Reference Range | What This Test Measures | Low and High Levels of Kidney Function Test |
|---|---|---|---|
| Albumin | 3.5-5.0 | Albumin is a protein made by the liver that helps keep fluid in your blood vessels. It also carries hormones, vitamins, and medicines through your body. |
High levels mean dehydration or high protein intake.
Low levels mean possible kidney damage, liver problems, or poor nutrition. |
| BUN | 7-20 | BUN, or blood urea nitrogen, shows how well your kidneys remove waste from your blood. It can also reflect how much protein you eat. |
High levels mean your kidneys may not be filtering waste well or you are dehydrated.
Low levels mean low protein intake or possible liver issues. |
| BUN/Creatinine Ratio | 10-20 | This ratio compares BUN and creatinine to help find out if kidney or other problems are causing changes in these levels. |
High levels mean possible dehydration or heart problems.
Low levels mean possible liver disease or malnutrition. |
| Calcium | 8.6-10.2 | Calcium is a mineral needed for strong bones, muscles, and nerves. Kidneys help control how much calcium stays in your blood. |
High levels mean possible kidney disease, overactive parathyroid, or too much vitamin D.
Low levels mean kidney problems, low parathyroid hormone, or vitamin D deficiency. |
| Carbon Dioxide | 23-29 | Carbon dioxide in your blood shows how well your kidneys and lungs balance acids and bases. It helps keep your body’s pH steady. |
High levels mean breathing problems or metabolic alkalosis.
Low levels mean kidney disease, metabolic acidosis, or severe diarrhea. |
| Chloride | 98-107 | Chloride is an electrolyte that helps keep the right balance of fluids and acids in your body. Kidneys help control chloride levels. |
High levels mean dehydration, kidney problems, or too much salt.
Low levels mean vomiting, heart failure, or Addison’s disease. |
| Creatinine | 0.6-1.3 | Creatinine is a waste product from muscles. Healthy kidneys remove it from your blood, so higher levels can mean your kidneys are not working as well. |
High levels mean reduced kidney function or muscle injury.
Low levels mean low muscle mass or certain muscle diseases. |
| Glucose | 70-99 | Glucose is your blood sugar. High or low levels can affect your kidneys and may be linked to diabetes or other conditions. |
High levels mean diabetes or stress on the kidneys.
Low levels mean not eating enough, insulin issues, or other hormone problems. |
| Phosphorus | 2.5-4.5 | Phosphorus is a mineral that helps build bones and teeth. Kidneys help keep the right amount in your blood. |
High levels mean kidney disease or too much vitamin D.
Low levels mean poor nutrition, alcohol use, or certain hormone problems. |
| Potassium | 3.5-5.1 | Potassium is an electrolyte that helps your muscles and heart work properly. Kidneys help keep potassium at the right level. |
High levels mean kidney problems or too much potassium in your diet.
Low levels mean vomiting, diarrhea, or not enough potassium in your diet. |
| Sodium | 135-146 | Sodium is an electrolyte that helps control fluid balance, blood pressure, and nerve function. Kidneys help keep sodium at a safe level. |
High levels mean dehydration or kidney problems.
Low levels mean too much water, heart failure, or certain hormone issues. |
Reference ranges can change over time. For the most current values, visit the Quest Diagnostics lab test directory.
Kidney Function Test FAQ
Is there Kidney Function Test testing near me?
You can find nearby locations for Kidney Function Test collection using the patient service center locator, which also lists mobile phlebotomy options. This is helpful if you need regular monitoring for kidney changes and want a site that’s easy to reach for timely sample collection.
What is the cost of the test?
The price you see for the Kidney Function Test includes all fees, including sample collection at patient service center locations. Ordering this test is worth it if you want to track kidney changes that could affect your treatment plan.
How often should I retest?
Most people with stable results retest every 6 to 12 months, but those with ongoing kidney concerns or changes in medication may need to order the test more often. Regular retesting helps catch changes early so you and your doctor can adjust your care as needed.
How accurate is the test?
The Kidney Function Test uses enzymatic and colorimetric methods for creatinine, BUN, and electrolytes, with a specificity of 98% and sensitivity of 97%. All tests at TrueHealthLabs.com are performed by CLIA-certified labs, meeting strict quality and precision standards.
Important Notes
Test results should always be interpreted by a qualified healthcare professional. Some results may require follow-up testing or additional evaluation.
Medical Review Board
Reviewed by Jeff Donohue M.D. from Body Logic and Brady Hurst DC, CCCN. Written by True Health Lab’s team of editorial health contributors.
Disclaimer: This information is for educational purposes only and not intended as medical advice. Consult your healthcare provider for personalized guidance.
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