GSTM1 and thalassemia: The authors showed that the ELISA strip test could detect Hb H (--/-α) 100% of the time (49/49); α0-thalassemia (--/αα)—100% (51/51); α+-thal (−3.7 kb; -α3.7/αα)—76.9% (30/39); α+-thal (−4.2 kb; -α4.2/αα)—100% (2/2); and heterozygous Hb CS (αCSα/αα)—92.3% (24/26).