To investigate mineralocorticoid function when standing up.
Fasting for 12 hours.
1 Either a first sample (EDTA tube) taken with the patient lying down and a second (EDTA tube) after one hour of walking.
2 Or a first sample taken after one hour of walking and a second after two hours lying down.
After centrifugation at room temperature, draw off the plasma and freeze as soon as possible.
Aldosterone and active renin.
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