TFRC and nutritional disorder: [Iron deficiency was defined by serum ferritin (sFt) levels of <12 μg/L or <20 μg/L, and serum transferrin receptor (sTfR) levels of >8.5 mg/L or >5.0 mg/L.] Hyder et al. found an iron-deficiency prevalence of 42% (sFt <12 μg/L) among pregnant woman in rural areas (52).