Elderly patients have higher TSH concentration
The distribution of TSH values in the population differs by age. In an analysis of 16,533 individuals in the National Health and Nutrition Examination Survey III (NHANES III), there was an age-related shift toward higher TSH concentrations in older patients. For example, the 97.5 centile for TSH in adults aged 20 to 29 years, or over age 80, was 3.56 and