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Thyroid Function Test Interpretation Table

TSH, Free T4, Free T3 and Associated Condition
#Diagnosis #Endocrinology #Hyperthyroid #Hypothyroid #Function
Free T4, Free T3 ... Endocrinology #Hyperthyroid ... #Hypothyroid #Function
Abnormal Serum TSH - Differential Diagnosis Algorithm
Increased TSH
 • Hypothyroidism
 • Sub-clinical Hypothyroidism
 • Recovery from
Thyrotoxicosis • T3 ... Diagnosis #Algorithm #Hypothyroid ... #Hyperthyroid #
Hyperthyroidism (low TSH, High T4/T3) - Diagnostic Algorithm

Radioactive iodine scan – get if concern for nodular
low TSH, High T4/T3 ... affects diagnostic workup ... Hyperthyroidism #Hyperthyroid ... Diagnosis #Algorithm #Workup
Laboratory Evaluation of Patients for Thyroid Disease 
Hyperthyroidism:
 • Graves disease - TSH low; free T4
high; in some cases ... , T3 is elevated ... low; free T4 and T3 ... disease course #hypothyroid ... #hyperthyroid #
Algorithm for the diagnostic workup of hyperthyroidism. (T3 = triiodothyronine; T4 = thyroxine; TSH = thyroid-stimulating
the diagnostic workup ... (T3 = triiodothyronine ... algorithm #diagnosis #workup
Approach to the Diagnosis of Hyperthyroidism - Differential Diagnosis and Workup Algorithm

 • Secondary Hyperthyroidism (↑↔TSH,
Diagnosis and Workup ... ↑↔TSH, ↑Total T3 ... (↓TSH, ↔Total T3 ... (↓TSH, ↑Total T3 ... (↔TSH, ↔Total T3
Approach to Hypoproliferative Macrocytic Anemia

 • 812, Folate Deficiency
 • MDS+
 • Hypothyroid
 • Liver Disease
Deficiency • MDS+ • Hypothyroid ... algorithm #hematology #workup
Evaluation of Secondary Hypertension
 • Primary aldosteronism - PRA, PAC
 • Renal artery stenosis - Renal
Hypothyroidism - TSH, T3 ... resistant #Evaluation #workup
Approach to Thyroid Function Tests in the Evaluation of Hyperthyroidism
 • Low TSH, Low normal T4
normal T4 +/- T3 ... Hyperthyroidism: Work-up ... TSH, high T4 +/- T3 ... TSH, high T4 +/- T3
Occult Causes of Non-Response to Vasopressors

vital disclaimer: the cognitive response to hypotension should not be reaching
Occult Causes of ... response -> cognitive pause ... - acidosis - hypothyroid ... toxicologic - 2nd cause ... #Differential #Causes