AFP and hereditary elliptocytosis: FER score (Table 2) = 0.01*HB-0.001*alpha-fetoprotein + 0.001*TBIL-0.019*PTA + 0.026*Age + 0.062*blood urea nitrogen (BUN) + 0.061*WBC + 0.996*infection (noted as 1, not noted as 0) + 1.127*HE (noted as 1, not noted as 0).