Fig. 1From: Interpretation of TSH and T4 for diagnosing minor alterations in thyroid function: a comparative analysis of two separate longitudinal cohortsThe distribution of twelve, monthly measurements of TSH and T4 among 35 subjects who were either euthyroid (black bars) or had mild thyroid hormone deficiency (shaded bars). The obvious overlap between the two groups for T4 (lower bar) receded for TSH (upper bar). This is in keeping with an amplified response in TSH to minor differences in T4Back to article page