My first test results from LabCorp showed my total T very low (156), but free T was actually within the reference range, though on the low end (9.8 with ref range of 7.2 - 24.0). Is this unusual? Any thoughts as to why? It almost makes me question the accuracy of the lab test. And regardless of the numbers, I am very symptomatic, with brain fog, fatigue, muscle weakness, sleepy after dinner, etc.