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Thyroid Function Test Interpretation Table

TSH, Free T4, Free T3 and Associated Condition
#Diagnosis #Endocrinology #Hyperthyroid #Hypothyroid #Function
Interpretation Table TSH ... Free T4, Free T3 ... Endocrinology #Hyperthyroid ... #Hypothyroid #Function ... Comparison #Table #TSH
Abnormal Serum TSH - Differential Diagnosis Algorithm
Increased TSH
 • Hypothyroidism
 • Sub-clinical Hypothyroidism
 • Recovery from
Abnormal Serum TSH ... Algorithm Increased TSH ... Thyrotoxicosis • T3 ... Diagnosis #Algorithm #Hypothyroid ... #Hyperthyroid #
Laboratory Evaluation of Patients for Thyroid Disease 
Hyperthyroidism:
 • Graves disease - TSH low; free T4
in some cases, T3 ... low; free T4 and T3 ... low; free T4 and T3 ... disease course #hypothyroid ... #hyperthyroid #
Approach to Thyroid Function Tests in the Evaluation of Hyperthyroidism
 • Low TSH, Low normal T4
• Low TSH, normal ... T4 +/- T3 → Subclinical ... • Low TSH, high ... T4 +/- T3 → Primary ... , high T4 +/- T3
Approach to the Diagnosis of Hyperthyroidism - Differential Diagnosis and Workup Algorithm

 • Secondary Hyperthyroidism (↑↔TSH,
Hyperthyroidism (↑↔TSH ... , ↑Total T3/Free ... , ↔Total T3/Free ... , ↑Total T3/Free ... , ↔Total T3/Free
Hyperthyroidism (low TSH, High T4/T3) - Diagnostic Algorithm

Radioactive iodine scan – get if concern for nodular
Hyperthyroidism (low TSH ... , High T4/T3) - ... Hyperthyroidism #Hyperthyroid
Thyroid Function Tests (TFTs) and Interpretation

 • TSH, Free T4, Free T3
 • T3 Uptake
 •
Interpretation • TSH ... Free T4, Free T3 ... • T3 Uptake ... FTI) • Reverse T3
Hyperthyroid States - Comparison Table - Laboratory Findings via RebelEM @srrezaie

#Diagnosis #Endocrinology #Hyperthyroid #States #Comparison #Table
Hyperthyroid States ... Endocrinology #Hyperthyroid ... Comparison #Table #TSH
Hyperthyroidism Overview

Clinical Manifestation of Hyperthyroidism:
 • Fatigue
 • Weight loss
 • Heat intolerance
 • Depression, nervousness
thyrotoxicosis • T3 ... • ↑ Total T3 ... or Thyrotropin (TSH ... ↑ FT4 and/or ↑ T3 ... : Reduce T4 -> T3
Algorithm for the diagnostic workup of hyperthyroidism. (T3 = triiodothyronine; T4 = thyroxine; TSH = thyroid-stimulating
(T3 = triiodothyronine ... T4 = thyroxine; TSH