| Test | Conventional | SI | Threshold |
|---|---|---|---|
| Blood Urea Nitrogen (BUN) | 7-20 mg/dL | 2.5-7.1 mmol/L (urea) | > 100 mg/dL suggests serious renal impairment |
| BUN-to-Creatinine Ratio | 10-20 ratio | 10-20 ratio | - |
| Creatinine, Serum | 0.6-1.3 mg/dL | 53-115 µmol/L | > 4.0 mg/dL (or a rapid rise) indicates significant renal impairment |
| Estimated GFR (eGFR) | ≥ 90 (normal kidney function) mL/min/1.73 m² | ≥ 90 mL/min/1.73 m² | < 15 mL/min/1.73 m² indicates kidney failure |
| Uric Acid | 3.4-7 mg/dL | 202-416 µmol/L | - |
Panel
Kidney Function
BUN, creatinine, eGFR, and uric acid - how the kidneys are filtering. 5 tests, 3 with a taught threshold.
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Frequently asked questions
What tests are in a Kidney Function?
The Kidney Function on this page lists 5 tests: Blood Urea Nitrogen (BUN), BUN-to-Creatinine Ratio, Creatinine, Serum, Estimated GFR (eGFR), Uric Acid. Each is shown with its conventional and SI teaching reference range.
What does the Kidney Function check for?
BUN, creatinine, eGFR, and uric acid - how the kidneys are filtering. These are educational teaching values - ranges vary by laboratory and method, and are not for clinical decisions.
Which Kidney Function values are critical?
3 of the 5 tests in this Kidney Function carry a taught threshold: Blood Urea Nitrogen (BUN) (> 100 mg/dL suggests serious renal impairment); Creatinine, Serum (> 4.0 mg/dL (or a rapid rise) indicates significant renal impairment); Estimated GFR (eGFR) (< 15 mL/min/1.73 m² indicates kidney failure). These are teaching thresholds, not clinical cutoffs - always use the values your laboratory reports.