--- title: "Renal Panel vs CMP vs BMP: Which Kidney Blood Test Should You Order?" type: guide url: "https://www.test-well.com/guides/renal-panel-vs-cmp" date_published: 2026-11-03 reviewed_at: 2026-11-04 --- # Renal Panel vs CMP vs BMP: Which Kidney Blood Test Should You Order? *All three measure creatinine and eGFR. The renal panel adds phosphorus and albumin for a kidney-focused read; the CMP trades those for liver enzymes and protein. Here is which one answers which question — and the urine test none of them includes.* > For a general check-up, the CMP ($21.49 + $6.00) is the better buy: it has everything the BMP has plus liver tests. For a known or suspected kidney problem, the Renal Panel ($22.99) is the better kidney test: the BMP's eight markers plus phosphorus and albumin, the two that change as kidney function falls. The BMP ($17.99) is the minimum — electrolytes, kidney function, glucose. Whichever you choose, add a urine albumin-to-creatinine ratio if you have diabetes or high blood pressure; none of the blood panels includes it. ## Recommended tests | Recommended | Type | Price | Why | | --- | --- | --- | --- | | [Renal Panel](https://www.test-well.com/tests/renal-panel) | Test | $22.99 | 10 kidney-focused markers — $22.99 | | [Comprehensive Metabolic Panel](https://www.test-well.com/tests/comprehensive-metabolic-panel) | Test | $21.49 | 14 markers: kidneys, electrolytes, glucose, liver — $21.49 | | [Basic Metabolic Panel](https://www.test-well.com/tests/basic-metabolic-panel) | Test | $17.99 | 8 markers: the minimum kidney and electrolyte check — $17.99 | | [Kidney Function Test (Cystatin C)](https://www.test-well.com/tests/cystatin-c) | Test | $36.99 | A second eGFR that ignores muscle mass — when creatinine could mislead | | [Urinalysis, Complete](https://www.test-well.com/tests/urinalysis) | Test | $17.99 | Protein, blood and glucose in the urine — the other half of a kidney check | | [Hemoglobin A1c](https://www.test-well.com/tests/hemoglobin-a1c) | Test | $18.99 | Diabetes is the leading cause of kidney disease; test both | All prices are cash-pay plus one $6 lab processing fee per order; physician authorization is included. ## What the three panels share — and what sets each apart Every one of these panels is built on the same kidney core: **creatinine**, the **eGFR** calculated from it (CKD-EPI 2021, no race term), **BUN**, and the electrolytes the kidneys regulate — **sodium, potassium, chloride and bicarbonate (CO2)** — plus **calcium** and **glucose**. That is the whole **Basic Metabolic Panel**: Glucose, BUN, Creatinine, Sodium, Potassium, Chloride, CO2, Calcium. The **Renal Panel** keeps all of that and adds **phosphorus** and **albumin**: BUN, Creatinine, eGFR, Sodium, Potassium, Chloride, CO2, Calcium, Phosphorus, Albumin. Phosphorus rises as the kidneys lose the ability to excrete it, albumin falls as protein is lost or nutrition suffers, and the calcium-phosphorus relationship is what nephrologists watch for bone and vascular complications. (Some labs' renal panels drop glucose; ours keeps the BMP core intact.) The **Comprehensive Metabolic Panel** keeps the BMP core and adds the liver instead: **ALT, AST, alkaline phosphatase, bilirubin, total protein and albumin** — Glucose, BUN, Creatinine, Sodium, Potassium, Chloride, CO2, Calcium, Total Protein, Albumin, Bilirubin, Alkaline Phosphatase, ALT, AST. It is the broadest of the three and the one most routine check-ups use, but it has no phosphorus. None of the three includes the **urine albumin-to-creatinine ratio**, which detects kidney damage years before eGFR falls and is half of how chronic kidney disease is defined and staged. For anyone with diabetes, high blood pressure, heart disease or a family history of kidney failure, a UACR belongs alongside whichever blood panel you choose. ## When the renal panel is the right choice - **Known chronic kidney disease**, at any stage: phosphorus and albumin are part of standard CKD monitoring, and the renal panel is the cheapest way to get them with the electrolytes and eGFR in one draw. - **A low eGFR or high creatinine found on a previous panel** that you are rechecking: the renal panel repeats the kidney numbers and adds the two markers that tell you whether the kidneys are already struggling with mineral balance. - **Kidney stones, polycystic kidney disease, or a single kidney**, where the question is kidney-specific and the liver is not in doubt. - **Medications that need kidney and electrolyte monitoring** — ACE inhibitors and ARBs, diuretics, lithium, NSAIDs long term, SGLT2 inhibitors, some antivirals and chemotherapy — where potassium, creatinine and phosphorus are the numbers being watched. - **Diabetes** with any kidney concern: the renal panel plus a UACR is the KDIGO monitoring pair. ## When the CMP (or BMP) is the better buy - **A general check-up or annual bloodwork**: the CMP's liver enzymes catch fatty liver, alcohol effects and medication side-effects that the renal panel cannot see, for a few dollars more than the BMP. - **Symptoms that could be liver or kidney** — fatigue, swelling, nausea, itching: the CMP covers both organs; a renal panel would miss a liver cause. - **Statins, methotrexate, antifungals, anti-seizure drugs and most medication monitoring**, where the liver is the organ being watched. - **Pre-operative or baseline testing**, where the broad screen matters more than phosphorus. - **The BMP** is enough when you need only electrolytes, glucose and kidney function rechecked quickly — dehydration, diuretic adjustment, potassium monitoring — and the price difference matters. If you want kidney depth *and* the liver, order the CMP and add a phosphorus test, or order the renal panel and a liver function panel; both combinations still cost less than most single visits to a doctor's office. ## Reading the kidney numbers on any of them **eGFR** above 90 is normal; 60–89 is mildly reduced and common with age; below 60 for more than three months is chronic kidney disease, staged 3a (45–59), 3b (30–44), 4 (15–29) and 5 (under 15). A single low value after dehydration, a heavy meat meal, creatine supplements or hard exercise is repeated before anything is concluded. **BUN** rises with dehydration and protein intake as well as kidney disease; a high BUN-to-creatinine ratio points to the former. **Potassium** above about 5.5 mmol/L with a low eGFR is the most urgent finding on any of these panels. **Phosphorus** climbing above range with a low eGFR, and **albumin** falling, mark the stage where nephrology and dietary management begin. **Bicarbonate** below about 22 mmol/L in CKD is metabolic acidosis, treated because it slows progression. Creatinine depends on muscle mass, so a very muscular person reads high and a frail or elderly person reads falsely normal; **cystatin C** gives a second eGFR that does not, and KDIGO recommends it to confirm CKD when creatinine could mislead. ## How to get tested and prepare Order the panel online, walk into any Quest or Labcorp location with your requisition — no doctor's visit or appointment needed — and results post to your account, usually within one business day. **Fast 8–12 hours** for the glucose on any of the three panels (water is fine), drink normally in the days before so dehydration does not inflate creatinine and BUN, and avoid creatine supplements, a large meat meal and intense exercise for 24 hours. If you are adding a urine albumin-to-creatinine ratio, a first-morning urine sample is the most reliable. ## Frequently asked questions ### Is a renal panel the same as a CMP? No. Both include creatinine, eGFR, BUN, electrolytes, calcium and glucose. The renal panel adds phosphorus and albumin for a kidney-focused picture; the CMP adds liver enzymes (ALT, AST, alkaline phosphatase), bilirubin, total protein and albumin instead. The renal panel has no liver tests; the CMP has no phosphorus. ### Which is better for checking kidney function? The renal panel, if the question is specifically the kidneys — phosphorus and albumin are part of standard chronic kidney disease monitoring. For a general check-up the CMP is the better value because it covers the liver too. Either should be paired with a urine albumin-to-creatinine ratio in people with diabetes or high blood pressure. ### What does a renal panel include? Ours includes 10 markers: BUN, Creatinine, eGFR, Sodium, Potassium, Chloride, CO2, Calcium, Phosphorus, Albumin. Some laboratories' renal panels omit glucose or add it back; the kidney core — creatinine, eGFR, BUN and electrolytes — is the same everywhere. ### Does a renal panel or CMP test for kidney disease? Both estimate kidney filtration (eGFR) and detect established reductions in function. Neither detects early kidney damage, which shows up first as albumin in the urine — the urine albumin-to-creatinine ratio. Chronic kidney disease is defined by either a low eGFR or albuminuria persisting for three months, so a complete kidney check is one of these blood panels plus a UACR. ### Do I need to fast for a renal panel or CMP? Fast 8–12 hours for the glucose on either panel, with water allowed. Also drink normally the day before and skip creatine, a large meat meal and hard exercise for 24 hours, all of which raise creatinine and BUN without the kidneys changing. ### Should I get a BMP or CMP? The CMP, unless you specifically need only electrolytes and kidney function rechecked. For a small price difference the CMP adds liver enzymes, bilirubin and proteins that catch common problems — fatty liver, medication effects, alcohol — the BMP cannot see. Our CMP vs BMP guide covers that comparison in detail. ## Sources - [KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease](https://kdigo.org/guidelines/ckd-evaluation-and-management/) - [Delgado C, et al. A unifying approach for GFR estimation: recommendations of the NKF-ASN Task Force on reassessing the inclusion of race in diagnosing kidney disease. Am J Kidney Dis. 2022;79(2):268–88](https://pubmed.ncbi.nlm.nih.gov/34563581/) - [MedlinePlus — Kidney (renal) function panel](https://medlineplus.gov/lab-tests/kidney-function-panel/) - [MedlinePlus — Comprehensive metabolic panel (CMP)](https://medlineplus.gov/lab-tests/comprehensive-metabolic-panel-cmp/) - [National Kidney Foundation — Albumin-to-creatinine ratio (uACR)](https://www.kidney.org/kidney-topics/albuminuria-proteinuria) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-11-04. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/guides/renal-panel-vs-cmp Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.