Recent Posts

Percent through Range

What is Percent through Range and how can we use it to help understand our thyroid meds? Like many lab tests, our thyroid lab results have a set of expected values — the laboratory reference range — that most doctors consider normal.A reference range, or interval, is a set of values that includes upper and… Continue reading Percent through Range

Update on Free T3 Testing

There are a few circumstances that may affect Free T3 (triiodothyronine) test results.  The following two test descriptions from LabCorp, a major nationwide diagnostic laboratory, indicate conditions which may interfere with testing and when the Dialysis and LC/MS-MS may be preferred.  Biotin may interfere with Free T3 and other thyroid tests.  Thyroid antibodies may interfere… Continue reading Update on Free T3 Testing

Basic T3 Startup

The first step to adding T3 to our thyroid hormone replacement regimen following total thyroidectomy (TT) is understanding what T3 is and how it works. The two thyroid hormones are thyroxine (T4) and triiodothyronine (T3). A healthy thyroid produces mostly T4 and smaller amounts of T3.  This production is controlled by a “negative feedback loop”… Continue reading Basic T3 Startup