What does a 24-hour urine output of 1300ml indicate?

24-Hour Urine Output of 1300mL: Clinical Interpretation

A 24-hour urine output of 1300mL is within the normal range and does not indicate polyuria, oliguria, or any pathological condition requiring intervention. This volume falls comfortably within expected physiologic parameters for adults.

Normal Urine Output Parameters

• Normal adult 24-hour urine output ranges from approximately 800-2000mL, making 1300mL entirely physiologic 1
• Polyuria is defined as urine output >50mL/kg body weight per 24 hours (typically >3000mL in a 70kg adult) 2
• This volume does not meet criteria for any water balance disorder

Clinical Context Matters

When This Volume Becomes Significant

Peritoneal dialysis patients:

• Volumes >100mL indicate preserved residual kidney function, which is a strong predictor of survival (RR 0.90 for every 100mL/24h increase) 3
• Anuria is defined as <100mL per 24 hours in this population 3

Pediatric considerations:

• Oliguria is defined as <0.5mL/kg per hour for 8 hours 4
• Anuria is defined as <0.3mL/kg per hour for 24 hours or 0mL/kg per hour for 12 hours 4

What Would Be Abnormal

Oliguria thresholds:

• Adults: <400-500mL per 24 hours
• Pediatrics: <0.5mL/kg per hour for 8 hours 4

Polyuria thresholds:

• 3000mL per 24 hours in most adults 1, 2

• Nocturnal polyuria: >33% of 24-hour output occurring at night 1, 5

Collection Adequacy Assessment

To ensure this measurement is accurate:

• Volume and total creatinine excretion should always be measured to assess collection completeness 3
• Defer collections until at least 1 month after acute illness or prescription changes 3
• Use appropriate containers (copper-free if measuring urinary copper) 3

No Action Required

For a patient with 1300mL/24hr urine output:

• No fluid restriction needed
• No workup for polyuria indicated
• No concern for oliguria or renal dysfunction based on volume alone
• Document as normal physiologic output