Increased fT4 concentrations in patients using levothyroxine without complete suppression of TSH.

Heleen I JansenMarijn M BultPeter H BisschopAnita Boelen Annemieke C Heijboer Jacquelien J Hillebrand

Published in: Endocrine connections (2023)

High fT4 without suppressed TSH concentrations can mainly be explained by L-T4 intake. Physicians and laboratory specialists should be aware of this phenomenon to avoid questioning the assay's performance or unnecessarily adapting the L-T4 dose in patients.

Keyphrases

end stage renal disease
newly diagnosed
chronic kidney disease
peritoneal dialysis
primary care
prognostic factors
high throughput