English to Russian Medical Medical: Pharmaceuticals

Following diagnosis of PTCL in September 2006, the woman received six cycles of CHOP chemotherapy(doxorubicin, vincristine, cyclophosphamide, prednisolone). During her first cycle, she developed adecreased serum sodium level of 132 mmol/L.

Я бы перевел сывороточный натрий, а как правильно в медицине и химии?