Underestimates of serum free thyroxine (T4) concentrations by free T4 immunoassays

1994 ◽  
Vol 79 (1) ◽  
pp. 76-79 ◽  
Author(s):  
J. C. Nelson
Keyword(s):  
Free Thyroxine ◽  
Free T4 ◽  
Serum Free ◽  
Serum Free Thyroxine

scholarly journals Measurement of Serum Free Thyroxine Index May Provide Additional Case Detection Compared to Free Thyroxine in the Diagnosis of Central Hypothyroidism

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Kevin M. Pantalone ◽  
Betul Hatipoglu ◽  
Manjula K. Gupta ◽  
Laurence Kennedy ◽  
Amir H. Hamrahian
Keyword(s):  
Elevated Serum ◽  
Free Thyroxine ◽  
Pituitary Hormone ◽  
Normal Range ◽  
Free T4 ◽  
Central Hypothyroidism ◽  
Serum Free ◽  
Free Thyroxine Index ◽  
Serum Tsh ◽  
Serum Free Thyroxine

The diagnosis of central hypothyroidism is often suspected in patients with hypothalamic/pituitary pathology, in the setting of low, normal, or even slightly elevated serum TSH and low free thyroxine (FT4). We present four cases of central hypothyroidism (three had known pituitary pathology) in whom central hypothyroidism was diagnosed after the serum free thyroxine index (FTI) was found to be low. All had normal range serum TSH and free thyroxine levels. This report illustrates that the assessment of the serum FTI may be helpful in making the diagnosis of central hypothyroidism in the appropriate clinical setting and when free T4 is in the low-normal range, particularly in patients with multiple anterior pituitary hormone deficiencies and/or with symptoms suggestive of hypothyroidism.

Factors Affecting the Serum Free Thyroxine Levels in Hospitalized Chronic Geriatric Patients

1993 ◽  
Vol 41 (7) ◽  
pp. 742-746 ◽  
Author(s):  
Istvan Szabolcs ◽  
Christoph Ploenes ◽  
Mathias Beyer ◽  
Wolfdieter Bernard ◽  
Jorg Herrmann
Keyword(s):  
Geriatric Patients ◽  
Free Thyroxine ◽  
Factors Affecting ◽  
Serum Free ◽  
Serum Free Thyroxine

scholarly journals Serum Free Thyroxine and Triiodothyronine Concentrations in Subacute Thyroiditis

1980 ◽  
Vol 56 (11) ◽  
pp. 1527-1534
Author(s):  
Katsumi YOSHIDA ◽  
Toshiro SAKURADA ◽  
Nobuko KAISE ◽  
Kazuo KAISE ◽  
Hirofumi KITAOKA ◽  
...  
Keyword(s):  
Free Thyroxine ◽  
Subacute Thyroiditis ◽  
Serum Free ◽  
Serum Free Thyroxine

scholarly journals Serum free thyroxine levels are associated with the efficacy of weight reduction therapy in obese female patients

2016 ◽  
Vol 63 (3) ◽  
pp. 221-229 ◽  
Author(s):  
Koshi Hashimoto ◽  
Tetsuya Tagami ◽  
Hajime Yamakage ◽  
Kazuya Muranaka ◽  
Masashi Tanaka ◽  
...  
Keyword(s):  
Weight Reduction ◽  
Free Thyroxine ◽  
Serum Free ◽  
Female Patients ◽  
Obese Female ◽  
Serum Free Thyroxine
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