Your T3 Free Level

What Causes Abnormal T3 Free Levels?

Abnormal T3 free levels can have various causes, just like most other symptoms.  Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.

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Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms.  In order to diagnose abnormal T3 free levels, we could:

  • Research the topic
  • Find a doctor with the time
  • Use a diagnostic computer system.
The process is the same, whichever method is used.

Step 1: List all Possible Causes

We begin by identifying the disease conditions which have "abnormal T3 free levels" as a symptom.  Here are two possibilities:
  • Hypothyroidism
  • Hyperthyroidism

Step 2: Build a Symptom Checklist

We then identify all possible symptoms and risk factors of each possible cause, and check the ones that apply:
heart racing/palpitations
being very easily irritated
minor swelling at front of neck
history of hyperthyroidism
yellow/yellowish fingernails
irritated eyes
low free T4
bulging eyes
much reduced sense of smell
very low HDL cholesterol level
mildly elevated TSH
bulging eyes from hyperthyroidism
... and more than 60 others

Step 3: Rule Out or Confirm each Possible Cause

A differential diagnosis of your symptoms and risk factors finds the likely cause of abnormal T3 free levels:
Cause Probability Status
Hypothyroidism 99% Confirm
Hyperthyroidism 58% Possible
* This is a simple example to illustrate the process

Arriving at a Correct Diagnosis

The Analyst™ is our online diagnosis tool that learns all about you through a straightforward process of multi-level questioning, providing diagnosis at the end.

If you indicate having had recent lab tests, The Analyst™ will ask further questions including this one:
T3 (Free). Unit: pg/mL [pmol/L]
Possible responses:
→ Don't know
→ Under 1.4 [0.021] (very low)
→ 1.4 to 2.0 [0.021-0.031] (low)
→ 2.1 to 4.4 [0.032-0.068] (normal)
→ Over 4.4 [0.068] (elevated)
Based on your response to this question, which may indicate low T3 free level, normal T3 free level or high T3 free level, The Analyst™ will consider possibilities such as:
... and also rule out issues such as:
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