Deep vein thrombosis was diagnosed with Doppler ultrasound, from the right popliteal vein through the right femoral vein, and laboratory tests revealed hemoglobin (Hb) of 4.83 g/dL, mean corpuscular volume (MCV) of 54.6 fL, mean corpuscular Hb (MCH) of 15.1 pg, and reticulocyte count of 5.6%. The gene discussed is GSTM1; the disease is deep vein thrombosis.