I have surfed internet and major of them say it should be connected with Kidney Disease of Diabetes but the most interesting is that
in blood analysis every indicator is within normal
range, except hematocrit, which is little low 42.9% then normal(43%-49%).
Also glucose test shows following:
GLUC fasting: 5.18 mmol/L, normal range ( 4.11 - 5.89 )
GLUC after 2 hours: 6.32 mmol/L, normal range ( < 6.