OBA_2045151 (level of Phosphatidylethanolamine (O-18:2_20:4) in blood serum) is the amount of a phosphatidylethanolamine O-18:2_20:4 when measured in blood serum. Also known as: blood serum phosphatidylethanolamine O-18:2_20:4 amount, level of phosphatidylethanolamine O-18:2_20:4 in blood serum.