Does Time of Sampling or Food Intake Alter Thyroid Function Test?
Context: A common question from most patients or laboratories is whether blood sample for thyroid‑stimulating hormone (TSH) and free T4 (fT4) needs to be collected in a fasting state and whether time of the day when sample is collected matters. Aims: The aim of the study was to study the impact of the time of day and food intake on levels of TSH and fT4. Settings and Design: Cross‑sectional prospective data collection. Subjects and Methods: We prospectively collected data from 52 volunteers who were not known to have any ...
