The mechanisms underlying the positive association of Hb levels with pregnancy blood pressure are incompletely understood, but previous evidences suggested that elevated Hb levels might impact hypertensive disorders in pregnant [7,10,11] as well as non-pregnant women [12] via hemoconcentration or increased blood viscosity, which is generally associated with both overall adiposity and abdominal adiposity [13]. The gene discussed is GSTM1; the disease is hypertensive disorder.