← All Biomarkers

Creatinine (urine)

Urine_kidney Unit: mg/dL Urine test

Kidney filtration marker in urine; used to calculate ACR

Also known as: Urine Creatinine,Ucr

Reference Ranges

Clinical Reference 20.0 – 370.0 mg/dL
Optimal Range 50.0 – 300.0 mg/dL

Random urine; 24hr: 800-2000 mg/day

Related Conditions

Kidney Disease Low

Food & Lifestyle Recommendations

🍎 Food Ensure adequate protein and calorie intake if underweight or malnourished Low urine creatinine often reflects low muscle mass from malnutrition or inactivity
🏃 Exercise Resistance training 2-3x/week builds muscle mass and increases creatinine production Muscle mass is the primary determinant of creatinine production rate

Evidence-Backed Supplements

When Low

  • Protein Tier B May Increase

    Well-established; adequate protein intake supports creatinine production. Low urine creatinine often reflects low muscle mass or malnutrition.

    Protein powder (whey, pea, or rice) 1–2 servings/day (20–30g each) Between meals or post-workout
    PMID 32483625

Questions to Ask Your Doctor

  • Could my low urine creatinine indicate kidney dysfunction or malnutrition? Low urine creatinine may reflect reduced muscle mass, malnutrition, or decreased kidney filtration.

Upload your blood test to see how your Creatinine (urine) compares to reference and optimal ranges.

Upload Blood Test