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Thyroid Function Test Interpretation Table

TSH, Free T4, Free T3 and Associated Condition
#Diagnosis #Endocrinology #Hyperthyroid #Hypothyroid #Function
Function Test Interpretation ... Table TSH, Free ... T4, Free T3 and ... FreeT3 #FreeT4 #Labs ... #Interpretation
Approach to Thyroid Function Tests in the Evaluation of Hyperthyroidism
 • Low TSH, Low normal T4
Can repeat labs ... T4 +/- T3 → Primary ... , high T4 +/- T3 ... #algorithm #diagnosis ... #Interpretation
Abnormal Serum TSH - Differential Diagnosis Algorithm
Increased TSH
 • Hypothyroidism
 • Sub-clinical Hypothyroidism
 • Recovery from
Differential Diagnosis Algorithm ... • Hypothyroidism ... • Sub-clinical Hypothyroidism ... Thyrotoxicosis • T3 ... #Hypothyroid #Hyperthyroid
Hyperthyroidism Overview

Clinical Manifestation of Hyperthyroidism:
 • Fatigue
 • Weight loss
 • Heat intolerance
 • Depression, nervousness
goiter • Toxic diffuse ... • ↑ Total T3 ... Hypotension • Labs ... and/or ↑ T3 - ... : Reduce T4 -> T3
Hyperthyroidism (low TSH, High T4/T3) - Diagnostic Algorithm

Radioactive iodine scan – get if concern for nodular
Hyperthyroidism ... (low TSH, High T4 ... /T3) - Diagnostic ... #Hyperthyroidism ... #Hyperthyroid #
Thyrotoxic Periodic Paralysis - Illness Script
 • Epidemiology: Asian men age 20-30 with hyperthyroidism of any
age 20-30 with hyperthyroidism ... thyrotoxicosis • Labs ... Hypokalemia +/- low TSH ... high fT4 or high T3 ... triggers, Treat hyperthyroidism