However, a 2014 study of sixteen pregnancies reported that 63% of infants (10/16) born to parents exposed to thiopurines were deemed anemic at birth with a median hemoglobin (Hb) concentration of 9.25 mmol/L (149g/L), IQR 8.25–9.60 mmol/L (133–155g/L).13 Concerned physicians may be more inclined to measure hemoglobin in infants exposed to thiopurine in utero, or even consider the discontinuation of thiopurine therapy in pregnant people with IBD. This evidence concerns the gene GSTM1 and inflammatory bowel disease.