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Urine Analysis (1/3): 24-Hour Urine Test
- Urine Analysis (1/3): sediment and dipstick
- Urine Analysis (2/3): urine culture
- Urine Analysis (3/3): 24-hour urine test
Indications for a 24-Hour Urine Collection
- Determination of the creatinine clearance
- After recurrence of renal stone disease
- Hormonal diseases and tumors of the adrenal glands
- Quantification of proteinuria in chronic renal diseases
24-Hour Urine: Standard Values
| Substance | Standard value |
| Urinary pH | 4,4–7,5 |
| Specific Gravity | 1,010–1,024 g/ml |
| Osmolality | 500–800 mosm/kg |
| Urea | 20–35 g/24 h |
| Calcium | <7,5 mmol/24 h |
| Uric acid | 0,3–0,6 g/24 h |
| Sodium | 40–140 mmol/l |
| Potassium | 40–120 mmol/l |
| Magnesium | 4–8 mmol/l |
| Chloride | 40–140 mmol/l |
| Protein | < 150–300 mg/24 h |
| Cortisol | < 100 mg/1,73m2/24 h |
| Aldosterone | < 30 μg/24 h |
| Vanillylmandelic acid | < 6,5 mg/24 h |
| Metanephrines | < 0,8 mg/24 h |
Calculation of the creatine clearance
The concentration of creatinine is measured in the urine from the 24 h urine test (Ucrea in mg/dl) and in the serum (Screa in mg/dl), in addition the urine volume (Uvol in ml) is measured with the collection period (24 h = 1440 min). The creatinine clearance (Clcrea) can be calculated using the following formula:
Creatinine clearance (ml/min) = (Ucrea × Uvol)/(Screa × 1440)
An estimation of the creatine clearance (after Cockroft and Gault) is possible with serum concentration (mg/dl), sex (faktor F=72 for men and F=85 for women), weight (kg) and age (years) using the following formula:
GFR = -(140-age)×weight / (F× Screa)
Index: 1–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
References
Deutsche Version: 24 h-Urin