Kidney Function Panel
Kidney Function Panel is a blood test panel that measures several lab report values related to filtration and urine protein markers. It typically includes Creatinine Clearance (CrCl), Uric Acid (UA), Cystatin C (CysC), BUN/Creatinine Ratio (BUN/Cr), Albumin/Creatinine Ratio (ACR), and Microalbumin (uAlb). These values are often reviewed together on a lab report because they provide a snapshot of related measurements in one place. On BloodSight, the panel is organized for easier tracking of Kidney Function Panel results over time, including normal range references when available.
Read the Kidney Function Panel guideWhat a Kidney Panel Reports
Kidney Function Panel stands for Kidney Function Panel. It is one of the most commonly ordered lab panels for tracking related chemistry values over time. The panel includes Creatinine Clearance (CrCl), Uric Acid (UA), Cystatin C (CysC), BUN/Creatinine Ratio (BUN/Cr), Albumin/Creatinine Ratio (ACR), and Microalbumin (uAlb). These values appear on a blood test or lab report as separate measurements, but they are often reviewed together because they describe related aspects of filtration and urine protein markers. The abbreviation is useful for matching the panel name across different lab report formats and BloodSight records.
When Doctors Look at Kidney Function
This Kidney Function Panel blood test is often included in routine checkups, pre-procedure screening, and health monitoring over time. It provides a snapshot of filtration-related values and urine protein markers in a single lab report. When Kidney Function Panel results are compared across dates, patterns in CrCl, UA, CysC, BUN/Cr, ACR, and uAlb can be tracked more easily. The panel is also used when a summary view of related lab values is needed for record keeping.
What's Measured in a Kidney Panel
Creatinine Clearance (CrCl) reflects how the lab report estimates filtering activity using creatinine-based data. Uric Acid (UA) is a chemical value that appears on many chemistry panels and can be listed as part of the Kidney Function Panel. Cystatin C (CysC) is another filtration-related marker often used alongside creatinine-based values. The BUN/Creatinine Ratio (BUN/Cr) combines two common chemistry values into one ratio for easier comparison on a blood test. Albumin/Creatinine Ratio (ACR) and Microalbumin (uAlb) focus on small amounts of albumin-related material listed in the report. Together, these measurements make the Kidney Function Panel easier to sort and compare in a lab report or blood test record.
Reading a Kidney Panel by Function
Kidney values are best read by what aspect of kidney function each one reflects: filtration, hydration, electrolyte handling, or acid-base. Hydration status alone shifts several values — meaning baseline draws under consistent conditions are easier to compare than draws taken in different states.
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eGFR — the headline filtration number
Estimated glomerular filtration rate (eGFR) is calculated from creatinine and is the most commonly tracked kidney metric. Stages of chronic kidney disease are defined by eGFR ranges. eGFR is age- and sex-adjusted in the formula your lab uses.
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Creatinine and BUN — the underlying values
Creatinine is the value eGFR is calculated from. BUN (blood urea nitrogen) is sensitive to hydration status. The BUN/creatinine ratio adds context: high ratio with high BUN often points toward dehydration; near-normal ratio with high creatinine points toward different patterns.
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Electrolytes and kidney handling
Potassium and bicarbonate are the electrolytes most informative about kidney handling — kidneys regulate both. Sodium and chloride are also relevant but shift more with hydration and intake than kidney function specifically.
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Calcium and phosphate
Calcium and phosphate (when reported) reflect kidney-mediated mineral metabolism. Long-term kidney disease often shifts both. Single values in isolation say less than the pattern across multiple panels.
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Trajectory beats a single panel
Kidney values are best read as a trajectory across multiple panels under similar hydration conditions. eGFR drift over years is more informative than any single value, and is the metric most commonly tracked in chronic kidney monitoring.
Kidney Function Reference Ranges
Kidney panels report creatinine, BUN, eGFR, and several electrolytes. The reference ranges below cover the typical adult ranges printed on most lab reports — eGFR specifically is age- and sex-adjusted in the formula your lab uses.
| Test | Normal range (Adult) | Unit | Flagged when |
|---|---|---|---|
| Creatinine Clearance CrCl | 90–140 | mL/min | < 90 or > 140 |
| Uric Acid | 3.5–7 | mg/dL | < 3.5 or > 7 |
| Cystatin C | 0.6–1 | mg/L | < 0.6 or > 1 |
| BUN/Creatinine Ratio | 10–20 | ratio | < 10 or > 20 |
| Albumin/Creatinine Ratio ACR | 0–30 | mg/g | < 0 or > 30 |
| Microalbumin | 0–17 | mg/L | < 0 or > 17 |
What Affects Kidney Panel Readings
Hydration status alone shifts BUN and creatinine more than most people expect, and recent protein-heavy meals or muscle exertion change creatinine within hours. The factors below describe the contributors most discussed for each kidney panel value.
Common factors for high values
- Higher fluid intake — more circulating fluid can raise the measured CrCl by increasing clearance. (affects Creatinine Clearance)
- Recent exercise — short-term changes in muscle activity can shift creatinine handling and affect CrCl. (affects Creatinine Clearance)
- Pregnancy — increased filtration can push CrCl above the usual Creatinine Clearance normal range. (affects Creatinine Clearance)
Common factors for low values
- Lower fluid intake — reduced circulating volume can lower the measured CrCl. (affects Creatinine Clearance)
- Incomplete urine collection — missed urine over the collection period can make CrCl appear low. (affects Creatinine Clearance)
- Lower muscle mass — less creatinine production can reduce the measured clearance rate. (affects Creatinine Clearance)
All Kidney Panel Values
Creatinine Clearance
CrClCreatinine Clearance (CrCl) is a lab value that shows how much creatinine is removed from the blood over a set time. On a lab report or blood test, CrCl helps summarize how efficiently the body clears this waste product using measured urine and blood values. It is often reviewed with a kidney panel and other routine labs to give a broader picture of filtration and fluid balance.
Uric Acid
Uric Acid is a blood measurement related to urate, a waste product from the breakdown of purines. On a Uric Acid on a blood test, the result helps describe how much urate is circulating in the blood at that moment. It is often listed on a kidney panel and is read alongside other lab values to give a broader view of blood chemistry.
Cystatin C
Cystatin C is a blood marker measured to estimate how well the kidneys are filtering and clearing small proteins from the bloodstream. On a Cystatin C on a blood test, the value is reported as a concentration and is often used with other lab values to give a broader picture of body chemistry. A Cystatin C test result can vary with age, muscle mass, and other factors, so the Cystatin C reference range depends on the lab method.
BUN/Creatinine Ratio
BUN/Creatinine Ratio is a calculated lab value that compares blood urea nitrogen (BUN) with creatinine. It is commonly shown on a kidney panel and helps describe how these two waste-related markers relate to each other on a blood test. A BUN/Creatinine Ratio on a lab report is read alongside the individual BUN and creatinine values for a fuller picture of blood chemistry.
Albumin/Creatinine Ratio
ACRAlbumin/Creatinine Ratio (ACR) is a urine measurement that compares albumin to creatinine in the same sample. On an Albumin/Creatinine Ratio lab report, ACR helps show how much albumin is present relative to urine concentration. It is often used in a kidney panel and is commonly reviewed as part of routine lab tracking.
Microalbumin
Microalbumin is a urine lab measurement that reflects a small amount of albumin in the sample. On a Microalbumin test, the result helps describe how much of this protein is present and whether it falls within the Microalbumin normal range. Microalbumin on a lab report is often reviewed with other kidney panel values to give a broader picture of urine protein handling.
Preparing for a Kidney Panel Draw
Preparation for a Kidney Function Panel blood test depends on the lab and the order details; some versions do not require fasting, while others may include specific instructions. A lab report usually notes the sample type, which is often blood and sometimes urine for ratio-based values. Bringing the order details and prior Kidney Function Panel results can make comparison easier in BloodSight records.
Kidney Panel — FAQ
What does a Kidney Function Panel blood test measure?
Do I need to fast for a Kidney Function Panel test?
What are normal Kidney Function Panel results?
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Companion Panels for Kidney Function
Kidney values rarely sit alone — they're usually part of a broader metabolic snapshot. The panels below most often share the same draw and add context to creatinine, BUN, eGFR, and electrolytes.
Disclaimer
This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendation. Reference ranges may vary by laboratory. Always discuss your results with a qualified healthcare professional.