A recent study in Sweden investigated participants in screening using f-Hb concentration thresholds of >40 μg Hb/g faeces in women and >80 μg Hb/g faeces in men.27 The yield of CRC was assessed and compared to a threshold of >80 μg Hb/g faeces in both genders. Here, GSTM1 is linked to colorectal carcinoma.