While there was no significant difference between baseline blood measurements of the two groups in terms of kidney function tests and electrolytes , following @ weeks of the study , the mean serum potassium level decreased from @ @ mEq/L to @ @ mEq/L in the LMW heparin group ( P = @ ) ; however , there was no change in the mean serum potassium level in those who continued to receive their usual dose of UF heparin .