Moreover, some are only optimised for reading Hb >40 g/l20,21 or have been repurposed in experimental research conditions but are currently not available on the market.23 EKF Diagnostics (Cardiff, UK) have recently released the DiaSpect TM, a handheld device with a measurement range of 0–255 g/l, with a Bluetooth interface which is yet to be tested in children with severe anaemia (https://www.ekfdiagnostics.com/diaspect.html). This evidence concerns the gene GSTM1 and anemia (phenotype).