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Thyroid Function Test Interpretation Table

TSH, Free T4, Free T3 and Associated Condition
#Diagnosis #Endocrinology #Hyperthyroid #Hypothyroid #Function
Thyroid Function ... Interpretation Table TSH ... Endocrinology #Hyperthyroid ... #Hypothyroid #Function ... Comparison #Table #TSH
Abnormal Serum TSH - Differential Diagnosis Algorithm
Increased TSH
 • Hypothyroidism
 • Sub-clinical Hypothyroidism
 • Recovery from
Abnormal Serum TSH ... Recovery from Non-Thyroid ... Thyrotoxicosis • Non-Thyroid ... Diagnosis #Algorithm #Hypothyroid ... #Hyperthyroid #
Laboratory Evaluation of Patients for Thyroid Disease 
Hyperthyroidism:
 • Graves disease - TSH low; free T4
high; in some cases ... iodine uptake; thyroid ... procedure that ablates thyroid ... disease course #hypothyroid ... #hyperthyroid #
Hyperthyroidism (low TSH, High T4/T3) - Diagnostic Algorithm

Radioactive iodine scan – get if concern for nodular
Hyperthyroidism (low TSH ... concern for nodular thyroid ... affects diagnostic workup ... Hyperthyroidism #Hyperthyroid ... Diagnosis #Algorithm #Workup
Algorithm for the diagnostic workup of hyperthyroidism. (T3 = triiodothyronine; T4 = thyroxine; TSH = thyroid-stimulating
the diagnostic workup ... T4 = thyroxine; TSH ... = thyroid-stimulating ... algorithm #diagnosis #workup
Hyperthyroidism - Differential Diagnosis Algorithm
High/Normal Radioiodine Uptake
 - Autoimmune Thyroid Disease:
    • Grave's
- Autoimmune Thyroid ... Positive anti-TSH ... - Autonomous Thyroid ... • Excessive Thyroid ... endocrinology #causes
Hyperthyroidism Overview

Clinical Manifestation of Hyperthyroidism:
 • Fatigue
 • Weight loss
 • Heat intolerance
 • Depression, nervousness
stimulators • TSH-producing ... Diagnosis: • ↓ Low TSH ... or Thyrotropin (TSH ... • Labs: - ↓ TSH ... hyperthyroidism #causes
Approach to Thyroid Function Tests in the Evaluation of Hyperthyroidism
 • Low TSH, Low normal T4
Approach to Thyroid ... • Low TSH, normal ... Hyperthyroidism: Work-up ... • Low TSH, high ... symmetrically enlarged thyroid
Algorithmic Approach to Hypothyroidism - Differential Diagnosis and Management Framework

Central Hypothyroidism (Secondary or tertiary) ↓TSH, ↓FT4
or tertiary) ↓TSH ... Hypothyroidism ↑TSH ... obtain TPOAb Euthyroid ... sick syndrome ↔TSH ... endocrinology #hypothyroid
Approach to the Diagnosis of Hyperthyroidism - Differential Diagnosis and Workup Algorithm

 • Secondary Hyperthyroidism (↑↔TSH,
Diagnosis and Workup ... Hyperthyroidism (↑↔TSH ... Hyperthyroidism (↓TSH ... Hyperthyroidism (↓TSH ... • Exogenous thyroid