Abstract:
:Heterophilic antibodies are well described, but poorly appreciated interferents and is often not a recognized problem affecting most immunoassays. We report a patient presented with ectopic Cushing's syndrome (CS), but repeated plasma adrenocorticotropic hormone (ACTH) concentrations conducted by immunoassay were inappropriately within the reference range and not elevated, most probably as a result of antibody interference. A 36-year-old woman, presented with large gastric neuroendocrine carcinoma and severe ectopic CS, while repeated plasma ACTH concentrations conducted by immunoassay were inappropriately within the reference range. As we expected ACTH concentration to be higher, we performed several tests to evaluate whether there was any assay interference causing falsely lower than expected ACTH results. We measured ACTH using a different immunoassay, assayed the sample in dilution, assayed the sample after being incubated in heterophilic antibody blocking agent tube and performed recovery studies. Tests indicated the presence of interfering compounds, most probably heterophilic antibodies. When clinicians find ACTH concentrations to be lower than expected, we recommend the laboratory investigate antibody interference.
journal_name
Ann Clin Biochemjournal_title
Annals of clinical biochemistryauthors
Saiegh L,Odeh M,Chen-Konak L,Elias N,Sheikh-Ahmad M,Reut M,Slobodin G,Bejar J,Shechner Cdoi
10.1177/0004563214520751subject
Has Abstractpub_date
2014-07-01 00:00:00pages
490-4issue
Pt 4eissn
0004-5632issn
1758-1001pii
0004563214520751journal_volume
51pub_type
杂志文章abstract::The most widely used methods for the assay of total bilirubin in serum are based on a coupling reaction with various diazo dyes in the presence of an accelerating agent. The 'direct' reaction, without accelerator, gives a good estimate of the conjugated and protein bound (delta) species of bilirubin only if carefully ...
journal_title:Annals of clinical biochemistry
pub_type: 杂志文章,评审
doi:10.1177/000456329102800202
更新日期:1991-03-01 00:00:00
abstract::We examined the reproducibility of oral glucose tolerance tests (OGTT) using the World Health Organization criterion in 212 Chinese subjects (male 149, female 63) who underwent two 75 g OGTTs within a 6-week period. The overall reproducibility was 65.6% (139/212) of which 74 subjects had normal glucose tolerance, 24 h...
journal_title:Annals of clinical biochemistry
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abstract:BACKGROUND AND AIM:Familial hypercholesterolaemia is caused by variants in the low-density lipoprotein cholesterol metabolic pathway involving LDLR, APOB and PCSK9 genes. A national genetic testing service in Wales, UK has observed that no familial hypercholesterolaemia variant is found in almost 80% patients with the ...
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journal_title:Annals of clinical biochemistry
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abstract::Background Detection of alcohol consumption in clients undergoing treatment for alcohol dependence can be difficult. The ethanol metabolites ethyl glucuronide and ethyl sulphate are detectable for longer in urine than either breath ethanol or urine ethanol. Our aim was to develop a liquid chromatography-tandem mass sp...
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abstract::A comparison of the Roche Cobas Core and Hybritech TANDEM-E PSA (prostate specific antigen) assays revealed a large difference in the reactivity of each assay to the separated free and complexed forms of serum PSA in patients with prostatic carcinoma. The Roche assay was relatively much more responsive to the free for...
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journal_title:Annals of clinical biochemistry
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