Radioimmunoassay of Thyroxine-Binding Globulin: Evaluation of a Kit and Diagnostic Application

1980 ◽  
Vol 17 (5) ◽  
pp. 241-246 ◽  
Author(s):  
J Ahmed ◽  
P Smethurst
Keyword(s):  
Confidence Limit ◽  
Late Pregnancy ◽  
Thyroid Function Test ◽  
Mean Value ◽  
Thyroxine Binding Globulin ◽  
Function Test ◽  
Free Thyroxine Index ◽  
The Mean ◽  
Uptake Test ◽  
Radioimmunoassay Method

Serum thyroxine-binding globulin (TBG) was measured by using a radioimmunoassay method. The within-batch coefficient of variation (CV) of the assay was 5 % or less at different TBG concentrations with a between-batch variation of less than 10%. The mean TBG concentration in hypothyroidism (28·5 ±6·7 mg/l) was significantly higher, and that in hyperthyroidism (22·3 ±3·5 mg/l) was significantly lower, than the euthyroid mean (25·4 ±6·9 mg/l). Acutely ill patients suffering from various non-thyroidal illnesses were found to have significantly low mean TBG (13·8 ± 4·3 mg/l). A group of women in late pregnancy had a higher mean value, as expected. Serum TBG level, however, was ineffective as a thyroid function test because of overlapping concentrations between groups. The derived index T4:TBG ratio was found to be superior to free thyroxine index (FTI) in many cases of acutely ill patients, pregnancy, and hereditary TBG abnormality. The 95% confidence limit for the ratio in euthyroids was 2·3 to 7·1. Serum TBG level with T4:TBG ratio is recommended as a replacement for the T3-uptake test and FTI.

The triiodothyronine uptake test: an assessment of methods.

1981 ◽  
Vol 27 (7) ◽  
pp. 1272-1276 ◽  
Author(s):  
L R Witherspoon ◽  
S E Shuler ◽  
M M Garcia
Keyword(s):  
Functional Status ◽  
Coefficient Of Variation ◽  
Temperature Effects ◽  
Thyroxine Binding Globulin ◽  
Wide Range ◽  
Free Thyroxine Index ◽  
Total Thyroxine ◽  
Multiple Measurements ◽  
Uptake Test ◽  
Commercial Kits

Abstract How well the free thyroxine index reflects thyroid functional status depends on the degree to which the triiodothyronine uptake test normalizes the effects of thyroxine binding protein concentrations on the total thyroxine concentration. We examined eight triiodothyronine uptake tests in which were used different secondary binders representative of those available in commercial kits. The relation between triiodothyronine uptake and thyroxine-binding globulin concentrations was established by use of sera from euthyroid individuals. We examined the effects of both high (greater than 20 mg/L) and low (less than 10 mg/L) thyroxine-binding globulin concentrations on triiodothyronine uptake. The precision of each assay, expressed as within- and between-run coefficient of variation, was calculated from multiple measurements on high, low, and midrange triiodothyronine uptake serum pools. The effects of variation in temperature and in exposure times were examined. The clinical most useful assays exhibited the ability to reflect a wide range of thyroxine-binding globulin concentrations and demonstrated little or no time or temperature effects.

scholarly journals Clinical Finding and Thyroid Function in Women with Struma Ovarii

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Ali Hosseini ◽  
Aida Moeini
Keyword(s):  
Thyroid Function ◽  
Final Analysis ◽  
Thyroid Function Test ◽  
Struma Ovarii ◽  
Presenting Symptoms ◽  
Function Test ◽  
Average Patient ◽  
The Mean ◽  
Serum Tsh ◽  
Hormonal Levels

Background. Struma ovarii (SO) is a variant of dermoid tumors which completely or mainly composed of thyroid tissues. Objective. We report our experience in the diagnosis and thyroid function of patients with SO in our hospital and also review the management and treatment option of this tumor. Materials and Methods. Between 2000 and 2012, 15 consecutive females with SO who were presented to our hospital were fully assessed. All women had histologically confirmed struma ovarii. The medical records of all patients including presenting symptoms, CT scan finding, and hormonal levels were collected for final analysis. Results. Average patient age was 36.6 years (ranging from 21 to 69). The mean ± SDs of serum TSH, T4, and T3 were  mUI/mL,  ng/dL, and  ng/dL, respectively. The value of TSH was lower than normal value in 26.7%. Also, antithyroglobulin and anti-TPO were positive in 2 and one cases, respectively. Conclusion. Based on our data, it is more likely to see a disturbance in serum values of thyroid function test in women with SO.

scholarly journals Assessment of the TMJ Dysfunction Using the Computerized Facebow Analysis of Selected Parameters

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Edward Kijak ◽  
Danuta Lietz-Kijak ◽  
Bogumiła Frączak ◽  
Zbigniew Śliwiński ◽  
Jerzy Margielewicz
Keyword(s):  
Age Groups ◽  
Mouth Opening ◽  
Mean Value ◽  
Qualitative And Quantitative Analysis ◽  
Temporomandibular Joint Dysfunction ◽  
Mean Values ◽  
Qualitative And Quantitative ◽  
Maximum Value ◽  
Function Test ◽  
The Mean

The Purpose of the Paper.Qualitative and quantitative analysis of selected parameters of mandible movements, electronically registered in patients with temporomandibular joint dysfunction and healthy ones.Material. Function test of the mandible movements was conducted in 175 patients. Gender distribution was 143 women and 32 men, aged 9 to 84.Methods. The studied population, after accurate clinical examination, was divided into age groups with the range of five years. All the patients had Zebris JMA computerized facebow examination done, according to the generally accepted principles and procedures.Results.Mean values of mouth opening calculated to 45.6 mm in healthy group and 37.6 mm in TMJ dysfunction group. Mean length of condylar path amounted to39±7% of the maximum value of mouth opening in the group of healthy people,44±11% in the case of muscle-based disorders, and35±11% with joint-based. The mean value of the condylar path inclination oscillated in the range of 25° to 45°.Conclusions. The ratio of length of the condylar path to the size of mouth opening may be a significant value characterising the type and degree of intensification of the TMJ dysfunctions.

Lacking evidence for release of thyroid hormones from circulating thyroglobulin during subtotal thyroidectomy

1988 ◽  
Vol 117 (2) ◽  
pp. 219-224 ◽  
Author(s):  
J. Date ◽  
M. Blichert-Toft ◽  
U. Feldt-Rasmussen ◽  
V. Haas
Keyword(s):  
Thyroid Hormones ◽  
Mean Value ◽  
Thyroid Stimulating Hormone ◽  
Mean Values ◽  
Thyroid Resection ◽  
Free Thyroxine Index ◽  
Total Triiodothyronine ◽  
Total Thyroxine ◽  
The Mean ◽  
Peak Value

Abstract. The effect of subtotal thyroid resection for thyrotoxicosis on concentrations of serum thyroid hormones and thyroglobulin (Tg), was determined in 10 patients during operation and the subsequent 18 days. Mean serum Tg responded drastically, increasing from a pre-operative value of 0.30 nmol/l to a peak value of approximately 26 nmol/l during operation followed by a gradual decline to levels lower than before surgery on day 18. Mean serum total thyroxine was 114 nmol/l pre-operatively and free thyroxine index (FT4I) 105 units. Both fluctuated only slightly during operation. Postsurgically, the mean values decreased to below 50% of the pre-operative level. Mean serum total triiodothyronine (TT3) was 1.46 nmol/l pre-operatively. It decreased during operation, reaching a nadir of 0.55 nmol/l on day 2, whereafter the concentration increased slightly. Mean serum reverse T3 (rT3) was 0.45 nmol/l pre-operatively, increased 62% during surgery, and decreased postsurgically. The mean value of serum thyroid stimulating hormone (TSH) was 0.61 mU/l pre-operatively and remained below 1 mU/l during and after operation, but from day 10 concentration began to rise steadily. It is concluded that the vast release of Tg during thyroid resection did not contribute to the concentration of serum T4 to an extent of clinical relevance.

Studies on reproduction in prolific ewes

1987 ◽  
Vol 108 (2) ◽  
pp. 311-319 ◽  
Author(s):  
W. S. Dingwall ◽  
J. J. Robinson ◽  
R. P. Aitken ◽  
C. Fraser
Keyword(s):  
Daily Intake ◽  
Live Weight ◽  
Late Pregnancy ◽  
Mean Value ◽  
Metabolizable Energy ◽  
Placental Weight ◽  
Embryo Survival ◽  
Foetal Growth ◽  
The Mean ◽  
Embryonic Death

SummaryIn Expt 1, 34 individually-penned Finn Dorset ewes of mean live weight 68 kg were synchronized in oestrus and mated to Suffolk rams. From mating until day 28 of pregnancy each received daily 15 MJ of metabolizable energy (ME) and 225 g crude protein (CP). From day 28 to slaughter on days 34, 41, 48 or 55 half of the ewes continued on this feeding regime and half had their daily intake reduced abruptly to 7·5 MJ of ME and 112 g CP. The mean number of ovulations per ewe was 4·03 (range 2–8) and the mean number of viable foetuses at time of slaughter 3·35 (range 2–6). The combined loss of ova (fertilization failure and early embryonic death) was 14·6% and detectable foetal deaths 2·2%. Level of feeding had no significant effect on these measures or on foetal growth. Foetal growth from 34 to 55 days was described by the equationIn w = 0·962–18·613 e-0·0272t–0·00091t(f–3),where w = foetal weight (kg), t = age (days) and f = litter size. Within-litter variability measured as the S.D. of In w (kg) was 0–081 for twins, 0·108 for triplets and 0·106 for quadruplets and higher multiples.In a second experiment Suffolk × Finn Dorset embryos were transplanted at the rate of two per uterine horn into 15 recipient Finn Dorset ewes. Embryo survival was 72% and foetal weights at 60 days varied from 67 to 146% of the mean value of 66 g. Withinlitter variation in foetal size was only about 70% of that expected for foetuses developing from the variable distribution in their initial positioning that occurs naturally. The correlation between foetal weight and placental weight at day 60 was 0·72 (P < 0001) indicating that the association between foetal weight and placental weight in prolific ewes is not confined to late pregnancy.The results of both experiments are consistent with the hypothesis that the greater within-litter variability in birth weight in large litters is controlled by events in early pregnancy.

scholarly journals Assessment of carotid intima-media thickness in hypothyroidism and the effect of thyroid replacement therapy

2018 ◽  
Vol 5 (2) ◽  
pp. 281
Author(s):  
Varun Vijayan ◽  
Jayasingh K. ◽  
Jayaraman G. ◽  
Siva Ranganathan Green ◽  
Deyagarasan E.
Keyword(s):  
Body Mass Index ◽  
Total Cholesterol ◽  
Intima Media Thickness ◽  
Thyroid Function Test ◽  
Carotid Intima Media Thickness ◽  
Media Thickness ◽  
Function Test ◽  
The Mean ◽  
The Right ◽  
Progression Of Atherosclerosis

Background: Carotid artery intima-media thickness (CAIMT) measurement in hypothyroidism will help assess the progression of atherosclerosis and timely intervention may prevent vascular complications.Methods: This study included 30 clinical hypothyroid (CH), 30 subclinical hypothyroid (SCH) and 30 euthyroid. As per procedure, informed consent was taken from the patients in prescribed formats before their participation in the study. Patients were divided into 3 groups of CHs, SCH and Controls after obtaining the thyroid function test values. CAIMT on the right side was measured in the three groups for comparison. Other parameters included age, sex, height, weight, body mass index (BMI), total cholesterol and triglycerides. After 4 months of levothyroxine therapy, CAIMT, total cholesterol and triglycerides were reassessed.Results: The CAIMT was increased in CH and SCH group when compared to euthyroid individuals. The mean CAIMT in CH group was 0.60±0.009cm, in SCH group it was 0.055±0.010 cm and in controls it was 0.047±0.006 cm. After 4 months of levothyroxine therapy, there was no change observed in the mean CAIMT values.Conclusions: CAIMT levels were increased in CH and SCH group when compared to euthyroid group. There was no regression of CAIMT after 4 months of levothyroxine therapy.

EVALUATION OF THYROID STATUS WITH THE "EFFECTIVE THYROXINE RATIO" (E. T. R.®)

1974 ◽  
Vol 77 (2) ◽  
pp. 250-256 ◽  
Author(s):  
Klaus Kølendorf ◽  
Kaj Siersbæk-Nielsen ◽  
Jens Mølholm Hansen ◽  
Thorkild Friis
Keyword(s):  
Thyroid Function ◽  
Thyroid Function Test ◽  
Free Thyroxine ◽  
Normal Range ◽  
High Positive Correlation ◽  
Function Test ◽  
Free Thyroxine Index ◽  
Hypothyroid Patients ◽  
Hyperthyroid Patients

ABSTRACT A new in vitro thyroid function test, "Effective Thyroxine Ratio" (ETR®) has been tested in 170 patients, and the ETR values in patients with normal and abnormal thyroid function have been compared to the concentration of absolute free thyroxine and free thyroxine index in serum. Among 42 hyperthyroid patients tested with ETR, 13 had values within normal range (30.9 per cent). Three of 18 hypothyroid patients had normal values (16.8 per cent). Eighty-nine per cent of 27 pregnant women and all of 17 patients treated with genuine oestrogens had ETR values within normal range. A high positive correlation was found between values of ETR, absolute free thyroxine in serum (r = 0.62) and free thyroxine index (r = 0.83).

scholarly journals An Evaluation of Serum Thyroxine Binding Globulin as a Routine Test of Thyroid Function

1979 ◽  
Vol 16 (1-6) ◽  
pp. 81-85 ◽  
Author(s):  
David R. McDowell
Keyword(s):  
Thyroid Function ◽  
Thyroid Function Test ◽  
Test Results ◽  
Uptake Ratio ◽  
Routine Test ◽  
Thyroid Status ◽  
Thyroxine Binding Globulin ◽  
Serum Thyroxine ◽  
Function Test ◽  
Diagnostic Index

Serum thyroxine binding globulin (TBG) values were correlated with other thyroid function test results and with the clinical condition in 680 patients. The estimation of serum TBG was helpful in the evaluation of thyroid status only in those patients who were either acutely ill, were taking the contraceptive pill, or were pregnant. Further, the derived index, thyroxine: TBG ratio, proved to be a better diagnostic index than the thyroxine: tri-iodothyronine uptake ratio and in many cases would have avoided the use of more expensive and time-consuming tests.

scholarly journals Thyroid Hormone Concentrations and Free Thyroxine Status in Neonatal Venous and Capillary Serum Pairs

1984 ◽  
Vol 21 (4) ◽  
pp. 306-309 ◽  
Author(s):  
Collen M O'Grady ◽  
R C Franklin
Keyword(s):  
Free Thyroxine ◽  
Sample Collection ◽  
Serum Samples ◽  
Term Neonates ◽  
Paired Samples ◽  
Free Thyroxine Index ◽  
Total Thyroxine ◽  
Assay Methods ◽  
The Mean ◽  
Uptake Test

The levels of thyroid hormones in paired venous and capillary serum samples taken from 68 healthy full-term neonates were determined by radioimmunoassay. Compared with capillary values, total thyroxine (T4), thyrotropin (TSH) and thyroxine-binding globulin (TBG) each showed a significant decrease in venous serum. The mean venous and capillary concentrations of tri-iodothyronine (T3), reverse tri-iodothyronine (rT3) and free thyroxine (fT4) were not significantly different; however, in each case the fitted linear relationship suggested that venous and capillary values were not concordant ( P<0·02, P<0·01, P<0·05 respectively). Both the T3 uptake test and the free thyroxine index (FTI) were significantly higher in venous serum, while the ratios of T4 to TBG in paired samples were equivalent. These results suggest that consistent sample collection and assay methods should be applied when assessing neonatal thyroid status, particularly if comparison of results is intended.

scholarly journals Cytological Evaluation of Thyroid and its Correlation with Thyroid Function Test and Anti-Thyroid Peroxidase in a Patient of Hashimoto’s Thyroiditis

2019 ◽  
Vol 8 (2) ◽  
pp. 57-61
Author(s):  
Manish Kumar Das ◽  
Meenakshi Basnet
Keyword(s):  
Thyroid Gland ◽  
Thyroid Function ◽  
Autoimmune Thyroiditis ◽  
Malignant Tumors ◽  
Thyroid Function Test ◽  
Thyroid Peroxidase ◽  
Thyroid Peroxidase Antibodies ◽  
Number Of Patients ◽  
Function Test ◽  
The Mean

Background: A thyroid swelling is an enlargement of thyroid glands causes by iodine deficiency, ageing, autoimmune disease and benign or malignant tumors. Autoimmune thyroiditis is the second most common thyroid lesion diagnosed after goiter. Materials and Methods: To find out the distribution of thyroid gland swelling in patients visiting otorhinolaryngology department of Nobel medical college and correlate serum thyroid function test and anti-thyroid peroxidase level with fine needle aspiration cytology reports. Results: The mean age of patient with thyroid gland lesions was 40.47 ± 13.05 years. Out of 87 patients studied, the highest number of patients (37, 42.5%) was diagnosed with colloid goiter followed by autoimmune thyroiditis (29, 33.3%). The mean age of patients with autoimmune thyroiditis was found to be 38.66 ± 12.31 years. The sensitivity and specificity of anti-thyroid peroxidase antibodies for diagnosing autoimmune thyroiditis was 89.7% and 94.8% respectively. Conclusion: Autoimmune thyroiditis has statistical correlation with serum anti-thyroid peroxidase antibodies and it can be effectively used as an alternative tool in diagnosing autoimmune thyroiditis with acceptable diagnostic accuracy.

Sign in / Sign up

Export Citation Format

Share Document