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Thyroid Function Test Interpretation Table

TSH, Free T4, Free T3 and Associated Condition
#Diagnosis #Endocrinology #Hyperthyroid #Hypothyroid #Function
Table TSH, Free T4 ... Endocrinology #Hyperthyroid ... #Hypothyroid #Function ... #Tests #TFTs #Comparison
Laboratory Evaluation of Patients for Thyroid Disease 
Hyperthyroidism:
 • Graves disease - TSH low; free T4
TSH low; free T4 ... elevated and free T4 ... TSH low; free T4 ... disease course #hypothyroid ... #hyperthyroid #
Hyperthyroid States - Comparison Table - Laboratory Findings via RebelEM @srrezaie

#Diagnosis #Endocrinology #Hyperthyroid #States #Comparison #Table
Hyperthyroid States ... - Comparison Table ... Endocrinology #Hyperthyroid ... #States #Comparison
Thyroid Disorders - Differential Diagnosis Algorithm
Hypothyroidism:
 • Hasimoto’s
 • Radioactive Iodine 
 • Hypopituitarism
 • Iodine
Diagnosis #Algorithm #Hypothyroid ... #Hyperthyroid
Abnormal Serum TSH - Differential Diagnosis Algorithm
Increased TSH
 • Hypothyroidism
 • Sub-clinical Hypothyroidism
 • Recovery from
Diagnosis #Algorithm #Hypothyroid ... #Hyperthyroid #
Hyperthyroidism (low TSH, High T4/T3) - Diagnostic Algorithm

Radioactive iodine scan – get if concern for nodular
(low TSH, High T4 ... Hyperthyroidism #Hyperthyroid
Amiodarone Toxicity and Monitoring

Tremor Ataxia 
Ocular neuritis 
Corneal Microdeposits 
Bradycardia 
Pulmonary fibrosis 
Hepatotoxicity 
Blue-gray skin
Photosensitivity Hyperthyroid ... Hypothyroid
Approach to Thyroid Function Tests in the Evaluation of Hyperthyroidism
 • Low TSH, Low normal T4
TSH, Low normal T4 ... Low TSH, normal T4 ... Low TSH, high T4 ... normal TSH, high T4
Hypothyroid Myopathy
Very common (up to 80% ) in patients with hypothyroidism
Pathophysiology:
 • T4 deficiency leads to
Hypothyroid Myopathy ... Pathophysiology: • T4 ... Rhabdomyolysis (rare) #Hypothyroid
Approach to the Diagnosis of Hyperthyroidism - Differential Diagnosis and Workup Algorithm

 • Secondary Hyperthyroidism (↑↔TSH,
↑Total T3/Free T4 ... ↔Total T3/Free T4 ... ↑Total T3/Free T4 ... ↔Total T3/Free T4