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Thyroid Function Pathway 

Hypothyroidism is a very common condition! Here's a repost of the pathway that
TSH and a low T4 ... is because if T4 ... stimulate more T4 ... levothyroxine (T4 ... Thyroid #Pathway #Pathophysiology
Hypothyroid Myopathy
Very common (up to 80% ) in patients with hypothyroidism
Pathophysiology:
 • T4 deficiency leads to
hypothyroidism Pathophysiology ... : • T4 deficiency ... Hypothyroid #Myopathy #pathophysiology
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 ... TSH low; free T4 ... TSH low; free T4
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
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
Thyroid Function Test Interpretation Table

TSH, Free T4, Free T3 and Associated Condition
#Diagnosis #Endocrinology #Hyperthyroid #Hypothyroid #Function
Table TSH, Free T4
Algorithm for the diagnostic workup of hyperthyroidism. (T3 = triiodothyronine; T4 = thyroxine; TSH = thyroid-stimulating
triiodothyronine; T4
Thyroid Function Tests (TFTs) and Interpretation

 • TSH, Free T4, Free T3
 • T3 Uptake
 •
• TSH, Free T4
Pharmaceutical Management of Hyperthyroidism / Thyroid Storm
Beta-Blockers 
• Decreases sympathetic hyperactivity 
• Partially blocks peripheral conversion
conversion of T4 ... conversion of T4
Anorexia Nervosa: Complications
CARDIAC ABNORMALITIES
 - Functional: Low BP, Sinus bradycardia, prolonged QT interval
 - Structural: Reduced
Low-Normal T3/T4 ... Complications #pathophysiology