Calculate the BUN-to-Creatinine Ratio From One Lab Panel

How to Use This Tool

Divide BUN by serum creatinine when both are reported in mg/dL. The ratio is sometimes treated as a diagnosis even though diet, bleeding, muscle mass, medication and kidney function affect its components.

What BUN/Creatinine Ratio actually establishes

Both values must be from the same specimen and in mg/dL; urea units used in other countries are not interchangeable. The page returns calculated bun/creatinine ratio from the measurements named below; BUN/Creatinine Ratio does not verify how they were collected or combine them with symptoms, examination findings and medical history.

Equation and input contract for BUN/Creatinine Ratio

For mg/dL inputs, the ratio equals BUN divided by serum creatinine. The required entries are Blood urea nitrogen, Serum creatinine; values should come from the same dated observation, specimen or record unless a label explicitly calls for different dates.

• For BUN/Creatinine Ratio, Blood urea nitrogen uses the example 20 mg/dL; replace it with the value and unit from the same record.
• For BUN/Creatinine Ratio, Serum creatinine uses the example 1 mg/dL; replace it with the value and unit from the same record.

Using calculated bun/creatinine ratio safely

Compare with the laboratory report and discuss the complete metabolic panel, symptoms and trends with a clinician. For BUN/Creatinine Ratio, an unexpected answer should prompt a check of units, dates, transcription and the original measurement method. Do not adjust medicine, feeding, fluids, exercise, screening or treatment to make the result match an expected value.

The page-specific limit of BUN/Creatinine Ratio

Hydration, diet, gastrointestinal bleeding, liver function, muscle mass, medication and diagnostic thresholds are excluded. Preserve that limitation with any saved calculated bun/creatinine ratio. A reference interval or action threshold still depends on the patient, collection method, laboratory and clinical setting, none of which this arithmetic selects automatically.

Evidence reviewed for BUN/Creatinine Ratio

The attached reference is NIH MedlinePlus — BUN blood test. It supports the equation, definition or measurement practice used for calculated bun/creatinine ratio, while the original report and a licensed pediatrician, physician, pharmacist or other relevant professional remain authoritative for interpretation.

Emergency boundary

Do not use a calculator during a possible emergency. Severe breathing difficulty, blue or gray color, seizure, fainting, new confusion, stroke symptoms, inability to wake or rapid deterioration require urgent local medical help.

Privacy and repeatability for BUN/Creatinine Ratio

BUN/Creatinine Ratio runs in the current browser tab without requesting a name, login or medical-record connection. Keep identifying details out of the fields, preserve the original units and remember that extra decimal places cannot repair an uncertain measurement.