2006
DOI: 10.1136/pmj.2006.049809
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Falsely raised TSH levels due to human anti-mouse antibody interfering with thyrotropin assay

Abstract: The case of a 39-year-old woman who was referred for weight gain and amenorrhoea is reported. Laboratory evaluation showed high levels of thyroid-stimulating hormone (TSH). The patient was started on increasing doses of levothyroxine for subclinical hypothyroidism. TSH remained persistently raised and the patient became thyrotoxic. Evaluation at another laboratory showed normal levels of TSH, raising the possibility of interfering substances. TSH levels were normalised with the addition of mouse serum to the p… Show more

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Cited by 14 publications
(5 citation statements)
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“…In addition, a normal TSH should not always be considered a reliable indicator for euthyreosis, especially in patients presenting with symptoms consistent with thyroid deficiency [ 40 ]. Several conditions such as age, pregnancy, and the presence of thyroid hormone antibodies may complicate the interpretation of TSH values [ 6 , 8 , 18 ]. In spite of these limitations, TSH remains the best means of assessing thyroid function in over 80% of patients.…”
Section: Refractory Hypothyroidism—clinical and Laboratory Findingsmentioning
confidence: 99%
“…In addition, a normal TSH should not always be considered a reliable indicator for euthyreosis, especially in patients presenting with symptoms consistent with thyroid deficiency [ 40 ]. Several conditions such as age, pregnancy, and the presence of thyroid hormone antibodies may complicate the interpretation of TSH values [ 6 , 8 , 18 ]. In spite of these limitations, TSH remains the best means of assessing thyroid function in over 80% of patients.…”
Section: Refractory Hypothyroidism—clinical and Laboratory Findingsmentioning
confidence: 99%
“…This finding was later confirmed by other authors [8] [16] and is corroborated by the current study. Possible reasons for this conflicting combination include interfering antibodies falsely raising TSH concentrations (as has been described in human patients [21] [22]), hyperthyroidism not severe or chronic enough to completely suppress pituitary TSH secretion [2], laboratory error [17], and tumors of the thyrotrophs that have ▶Fig. 2 Boxplot of TSH concentrations (ng/mL) in the respective groups depicted as median, interquartile range and full range.…”
Section: Discussionmentioning
confidence: 99%
“…This finding was later confirmed by other authors 8 , 16 and is corroborated by the current study. Possible reasons for this conflicting combination include interfering antibodies falsely raising TSH concentrations (as has been described in human patients 21 , 22 ), hyperthyroidism not severe or chronic enough to completely suppress pituitary TSH secretion 2 , laboratory error 17 , and tumors of the thyrotrophs that have so far only been described in humans 23 . Interfering heterophile (poorly defined antibodies that cause interference by non-competitive binding mostly to the Fc region of assay antibodies) 24 or anti-animal antibodies (antibodies binding to proteins and antibodies of specific species) are the most likely explanation in 2 cats of this study, as elevated TSH was verified by repeated analyses on separate occasions and T4 was very high.…”
Section: Discussionmentioning
confidence: 99%
“…Immunometric assays are particularly more vulnerable to such interference. There have been numerous case reports of heterophilic interference in thyroid function tests,[ 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ] with Thyroid Stimulating Hormone (TSH) as the most common analyte affected. Although currently, manufacturers routinely add blocking agents to their assay formulations, not all heterophile interference can be blocked as suggested by some case reports.…”
Section: Introductionmentioning
confidence: 99%