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British Journal of Sports Medicine logoLink to British Journal of Sports Medicine
. 2003 Jun;37(3):267–269. doi: 10.1136/bjsm.37.3.267

Day to day variability in the transferrin receptor/ferritin index in female athletes

R Stupnicki 1, J Malczewska 1, K Milde 1, A Hackney 1
PMCID: PMC1724639  PMID: 12782555

Abstract

Results: The error for ferritin concentration was nearly twice as high in athletes as in controls, that for sTfR concentration was identical in the two groups, and that for the sTfR/logFerr index was about 50% higher in athletes than in controls.

Conclusions: The within subject, day to day error for the sTfR/logFerr index computed from data recorded for untrained subjects cannot serve as a reference value for training athletes. When the sTfR/logFerr index is used to monitor iron stores in athletes, an error value of 0.20 should be used, because determination of the index after a few days of rest may not be feasible.

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