Preparation | ◆ Free access to fluid overnight prior to test ◆ Avoid caffeine and smoking ◆ 0730 h weigh patient ◆ Cannulate patient ◆ Rest patient 30 min |
Water load phase | ◆ 0800 h plasma and urine osmolality, plasma vasopressin ◆ Patient to drink 20 ml/kg water over 15 min ◆ Measure hourly urine output for 4 h ◆ Measure urine osmolality, plasma osmolality and plasma vasopressin hourly for 4 h |
Recovery phase | ◆ Plasma sodium 2 h after test completed ◆ Plasma sodium and osmolality 0900 h next day |
Preparation | ◆ Free access to fluid overnight prior to test ◆ Avoid caffeine and smoking ◆ 0730 h weigh patient ◆ Cannulate patient ◆ Rest patient 30 min |
Water load phase | ◆ 0800 h plasma and urine osmolality, plasma vasopressin ◆ Patient to drink 20 ml/kg water over 15 min ◆ Measure hourly urine output for 4 h ◆ Measure urine osmolality, plasma osmolality and plasma vasopressin hourly for 4 h |
Recovery phase | ◆ Plasma sodium 2 h after test completed ◆ Plasma sodium and osmolality 0900 h next day |
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