I have been measured with Serum TSH level of 3.82. My Drs guidance says levels of up to 5 are normal . But I read recently the US medial authorities have recently reduced the guidelines for Hypothyroidism to a maximum TSH level of 2.5 . This suggests a mild level of Hypothyroidism since I am well above . My T4 levels [10.2] are near the low end low of the guideline range - suggested by my Dr's lab. [ 9-22 being "normal" ] . I have numerous food allergies/intolerance , suffer from the cold , feel tired /sleepy a lot , suffer with dry skin, brittle rigged nails and weight gain . Does this suggest I have an under active thyroid ? I am 67 and the tests were fasting one done in the mid morning ..