Figure 4From: Pediatric reference intervals for thyroid hormone levels from birth to adulthood: a retrospective study Age-related reference values for fT4 (both sexes). The central 95% range (2.5th, 25th, 50th, 75th, and 97.5th percentiles) is shown. Due to resolution reasons lines start at zero, although no samples were taken within the first hours after birth.Back to article page