J. Tenkate et al., THE IRON CONTENT OF SERUM FERRITIN - PHYSIOLOGICAL IMPORTANCE AND DIAGNOSTIC-VALUE, European journal of clinical chemistry and clinical biochemistry, 35(1), 1997, pp. 53-56
In this paper we present a method for determining the iron saturation
of ferritin as a possible independent predictor of iron stores. Serum
ferritin was purified by immunochemical precipitation, and could be co
mpletely recovered from serum without any contamination from transferr
in. The iron content of the precipitated ferritin was determined by fl
ameless atomic absorption spectrophotometry (FAAS) and the ferritin-ir
on saturation was calculated using the original serum ferritin concent
ration. The intra- and inter-assay variation coefficients were 4.2% an
d 13.4% respectively. The first results with this assay indicate that
serum ferritin contains a considerable amount of iron. Furthermore the
results show that the iron saturation of ferritin in patients with ac
ute phase response is significantly lower than the saturation found in
healthy volunteers (19.3% and 24.3% respectively). These results sugg
est a possible role for the ferritin-iron saturation in the assessment
of iron stores in patients suffering from acute phase response. Tn ad
dition, the considerable amount of iron in ferritin suggests the need
to revise the physiological role of this substance in relation to the
serum iron homeostasis.