29 results
Laboratory Evaluation of Patients for Thyroid Disease 
Hyperthyroidism:
 • Graves disease - TSH low; free T4
of Patients for Thyroid ... normal; T3 low; ... concentrations of TSH and thyroid ... disease course #hypothyroid ... #hyperthyroid #
Approach to Thyroid Function Tests in the Evaluation of Hyperthyroidism
 • Low TSH, Low normal T4
Approach to Thyroid ... TSH, Low normal ... • Low TSH, normal ... T4 +/- T3 → Primary ... Hyperthyroidism #algorithm
Abnormal Serum TSH - Differential Diagnosis Algorithm
Increased TSH
 • Hypothyroidism
 • Sub-clinical Hypothyroidism
 • Recovery from
Abnormal Serum TSH ... Differential Diagnosis Algorithm ... Recovery from Non-Thyroid ... Thyrotoxicosis • Non-Thyroid ... #Hypothyroid #Hyperthyroid
Hyperthyroidism (low TSH, High T4/T3) - Diagnostic Algorithm

Radioactive iodine scan – get if concern for nodular
Hyperthyroidism (low ... TSH, High T4/T3 ... ) - Diagnostic Algorithm ... concern for nodular thyroid ... Hyperthyroidism #Hyperthyroid
Approach to the Diagnosis of Hyperthyroidism - Differential Diagnosis and Workup Algorithm

 • Secondary Hyperthyroidism (↑↔TSH,
Diagnosis and Workup Algorithm ... Graves disease • Low ... Iodine Scan - Low ... • Exogenous thyroid ... Differential #Diagnosis #Algorithm
Hypercalcemia - Differential Diagnosis Algorithm
Elevated PTH (High or normal):
 • Primary Hyperparathyroidism
 • Familial Hypocalciuric Hypercalcemia
Low
Differential Diagnosis Algorithm ... Elevated PTH (High or normal ... ): • Primary Hyperparathyroidism ... Hypercalcemia Low ... Bone Resorption: Hyperthyroid
Hyperthyroidism Overview

Clinical Manifestation of Hyperthyroidism:
 • Fatigue
 • Weight loss
 • Heat intolerance
 • Depression, nervousness
• Insomnia Primary ... Diagnosis: • ↓ Low ... T3 • ↑ Free T4 ... suspected • Thyroid ... Glucocorticoids: Reduce T4
Causes of Anemia with Normal Mean Corpuscular Volume (MCV) - Differential Diagnosis Algorithm
Decreased WBCs
 - Decreased/NormaI
Differential Diagnosis Algorithm ... Reticulocytosis • Primary ... Anemias (MAHA) - Abnormal ... Cancer • Hypothyroid ... Differential #Diagnosis #Algorithm
Hyperthyroidism - Differential Diagnosis Algorithm
High/Normal Radioiodine Uptake
 - Autoimmune Thyroid Disease:
    • Grave's
Differential Diagnosis Algorithm ... High/Normal Radioiodine ... - Autoimmune Thyroid ... Trophoblastic Neoplasm Low ... Differential #Diagnosis #Algorithm
Hypothyroid Myopathy
Very common (up to 80% ) in patients with hypothyroidism
Pathophysiology:
 • T4 deficiency leads to
Hypothyroid Myopathy ... Pathophysiology: • T4 ... deficiency leads to abnormal ... hypertrophy of slow-twitching ... Rhabdomyolysis (rare) #Hypothyroid