I always have edema of the whole body, although my total body water is 56% (+ - 3%). what's the reason of edema? what tests could you recommend me?

?, Check Albumen: Accurately measuring body water is a bit difficult; ? The value; it would correspond to significant body fat. Blood pressure, ~25 mmhg capillary inlet, 15 outlet, constantly pushes blood plasma water out of capillaries into tissues, body wide. Check albumen, half-life ~12-14 hrs, constantly made by liver, osmotically attracts water from tissue back into capillaries. If low, edema more common.