Falsely low serum thyroxine levels caused by interference with the thyroxine assay.
A case of euthyroid hypothyroxinaemia caused by the interference of the patient's serum with the Abbott thyroxine TDx assay is reported. This cause of falsely low serum thyroxine levels is probably rare but possibly underrecognized. Clinical implications are discussed.
Stehouwer
M H
MH
Department of Internal Medicine, Bergweg Municipal Hospital, Rotterdam, The Netherlands.
Stehouwer
C D
CD
Hackeng
W H
WH
D000328:Adult; D005189:False Positive Reactions; D016231:Fluorescence Polarization Immunoassay; D006801:Humans; D007037:Hypothyroidism / Q000175:diagnosis*; D008297:Male; D013974:Thyroxine / Q000097:blood*
D013974:Thyroxine