Abstract:
BACKGROUND:The presence of IgA antibodies to tissue transglutaminase (anti-tTg) is associated with variable risk for celiac disease. The use of common multiples of the upper limit of normal (ULN) has been suggested to optimize diagnostic pathways as well as improve harmonization between assays. METHODS:The characteristics of four anti-tTG IgA assays relative to endomysial IgA (EMA) by indirect immunofluorescence assay (IFA) as reference test were assessed. Commutability between anti-tTG immunoassays and/or EMA based on manufacturer's recommended cut-off values and three common multiples of ULN (3×, 5× and 10×) was also investigated. Sera from 200 patients and 100 healthy individuals were analyzed. RESULTS:At manufacturer's cut-off; the sensitivities for the tTG assays ranged from 72.5% to 98.6% and specificities from 60.3% to 99.2%. The percent positive agreements between any anti-tTG and EMA or any two anti-tTG immunoassays varied from 56.7% to 98.0% and 46.7% to 100.0%, respectively. At 3×, 5× or 10× ULNs, the inter-rater reliability as measured by Cohen κ between any two anti-tTG assays were quite variable and ranged from 0.28 to 0.96, 0.26 to 0.89 or 0.13 to 0.78, respectively. Furthermore, the percent positive agreements between any two anti-tTg IgA immunoassays ranged from 83.1% to 98.2%, 92.0% to 100%, or 100%, at 3×, 5× or 10×, respectively. CONCLUSIONS:Commutability between tTG IgA immunoassays or tTG IgA and EMA is kit-dependent and common multiples of the ULN are not sufficient to correct for inter-assay variations. Many factors influence the performance of anti-tTG IgA assays which limit their commutability.
journal_name
Clin Chem Lab Medjournal_title
Clinical chemistry and laboratory medicineauthors
Suh-Lailam BB,Davis KW,Tebo AEdoi
10.1515/cclm-2015-0348subject
Has Abstractpub_date
2016-02-01 00:00:00pages
257-64issue
2eissn
1434-6621issn
1437-4331pii
/j/cclm.ahead-of-print/cclm-2015-0348/cclm-2015-03journal_volume
54pub_type
杂志文章abstract::It has been well reported over recent years that most errors within the total testing process occur in the pre-analytical phase (46%-68.2%), an area that is usually outside of the direct control of the laboratory and which includes sample collection (phlebotomy). National and international (WHO, CLSI) guidelines recom...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章,实务指引
doi:10.1515/cclm-2016-0426
更新日期:2017-01-01 00:00:00
abstract:BACKGROUND:Cholesterol homeostasis disorders may cause dyslipidemia, atherosclerosis progression and coronary artery disease (CAD) development. Evaluation of non-cholesterol sterols (NCSs) as synthesis and absorption markers, and lipoprotein particles quality may indicate the dyslipidemia early development. This study ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/cclm-2016-0505
更新日期:2017-03-01 00:00:00
abstract::This paper reports on a pilot external quality assessment scheme for bone markers including serum bone alkaline phosphatase and procollagen 1-carboxy terminal propeptide together with urine deoxypyridinoline, N- and C-telopeptides. The data shows poor numerical agreement between commercial assays, between-laboratory i...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2000.168
更新日期:2000-11-01 00:00:00
abstract:BACKGROUND:Serum amino acids, part of a pool of free amino acids, are influenced by metabolism and disease. Few reports exist describing their function and concentrations in serum. Our study aimed to determine age- and gender-related differences in serum amino acid concentrations in healthy Japanese patients, focusing ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/cclm-2011-0846
更新日期:2012-01-04 00:00:00
abstract::An alcohol-associated change in the serum transferrin glycoform pattern, carbohydrate-deficient transferrin (CDT), is used as a biomarker of chronic moderate to heavy alcohol consumption. A current limitation in CDT analysis is the lack of standardization, which hampers clinical and analytical comparison between studi...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2007.107
更新日期:2007-01-01 00:00:00
abstract:BACKGROUND:Previous genomic linkage studies have produced evidence linking sodium-lithium countertransport activity (Na/Li CT) with various chromosomal regions including loci harbouring glutathione S transferase (GST) genes. The aim of this study was to examine the putative association of erythrocyte Na/Li CT activity ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2008.065
更新日期:2008-01-01 00:00:00
abstract::Abstract Lipoprotein-related risk of cardiovascular disease (CVD) can be adequately predicted in subjects with elevated total cholesterol and low-density lipoprotein (LDL-)cholesterol using the available guidelines. However, individuals with dyslipidemia can have normal total- and LDL-cholesterol concentrations. Many ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章,评审
doi:10.1515/cclm-2011-0636
更新日期:2012-04-10 00:00:00
abstract::Increased expression of sialyl Lewis X or A antigens on metastatic cancer cells leads to their selectin-mediated extravasation. Profound fucosylation of the serum microenvironment may be a factor that interrupts adhesion and influences the formation of metastases. In this study we quantitatively analyzed fucosylation ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2005.066
更新日期:2005-01-01 00:00:00
abstract:BACKGROUND:The plasma total and low-density lipoprotein-cholesterol (LDL-C) levels that are used as diagnostic criteria for familial hypercholesterolaemia (FH) probands in the general population are too stringent for use in relatives, given the higher prior probability of a first-degree relative being FH (50% vs. 1/500...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2008.135
更新日期:2008-01-01 00:00:00
abstract::Glycosylation is among the most important post-translational modifications for proteins and is of intrinsic complex character compared with DNAs and naked proteins. Indeed, over 50%-70% of proteins in circulation are glycosylated, and the "sweet attachments" have versatile structural and functional implications. Both ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章,评审
doi:10.1515/cclm-2018-0379
更新日期:2019-03-26 00:00:00
abstract:BACKGROUND:The appearance of nucleated red blood cells (NRBCs) in peripheral blood is associated with a variety of severe diseases. When NRBCs are detected in blood, this is generally associated with increased mortality. METHODS:In a prospective study, NRBCs and other laboratory parameters were measured daily in the p...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2006.183
更新日期:2006-01-01 00:00:00
abstract::Background Delta check is widely used for detecting specimen mix-ups. Owing to the inadequate specificity and sparseness of the absolute incidence of mix-ups, the positive predictive value (PPV) of delta check is considerably low as it is labor consuming to identify true mix-up errors among a large number of false ale...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/cclm-2019-0534
更新日期:2020-02-25 00:00:00
abstract:BACKGROUND:After the re-introduction of ImmunoCAP® ISAC sIgE 112 on the market, we undertook a study to evaluate the performance of this multiplex-based immunoassay for IgE measurements to allergen components. METHODS:The study was carried out at 22 European and one South African site. Microarrays from different batch...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章,多中心研究
doi:10.1515/cclm-2016-0586
更新日期:2017-03-01 00:00:00
abstract:BACKGROUND:The presence of preanalytical mistakes (PM) in samples from primary care centres (PCC) is a widely studied topic. Different correcting strategies have been proposed, with variable success. We planned a series of multidisciplinary sessions for clinical update, with the aim to decrease PM rates in samples from...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/cclm-2016-1002
更新日期:2017-10-26 00:00:00
abstract:BACKGROUND:There are several methods for calculating serum osmolality, and their accordance with measured osmolality is the subject of controversy. METHODS:The concentrations of sodium, potassium, glucose, blood urea nitrogen (BUN) and osmolalities of 210 serum samples were measured. Two empirical equations were deduc...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2005.109
更新日期:2005-01-01 00:00:00
abstract::Given the lack of information about Y haplotypes for Campania (southern Italy), we analyzed eight Y short tandem repeats in a sample of males from this region with the aim of establishing a Y-haplotype database that can be used for forensic purposes. The eight Y short tandem repeats were amplified by two PCR multiplex...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2005.027
更新日期:2005-01-01 00:00:00
abstract::The acute-phase "panproteinase" inhibitor alpha2-macroglobulin (alpha2M), a protein involved in inflammatory reactions, has been identified in amyloid plaques in Alzheimer's disease (AD). In addition, alpha2M is involved in AD susceptibility at the genetic level, and a deletion polymorphism at the a2M gene has been fo...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2002.052
更新日期:2002-04-01 00:00:00
abstract:BACKGROUND:There is a certain difference in opinion regarding the optimal choice of housekeeping genes used as normalization factors in gene expression analysis. We have therefore examined the suitability of three housekeeping genes, hypoxanthine phosphoribosyl transferase, beta-glucuronidase and beta2-micro-globulin, ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2007.303
更新日期:2007-01-01 00:00:00
abstract:BACKGROUND:Insulin-like growth factors (IGFs) are believed to be important in brain development and repair following neuronal damage. It is also speculated that IGFs are involved in the association of foetal and pre-adult growth with schizophrenia (SZ). METHODS:The aim of this study was to assess levels of IGF-I, IGF-...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2007.265
更新日期:2007-01-01 00:00:00
abstract::Human protein 1/Clara cell Mr 10,000 protein consists of two identical subunits of seventy amino acid residues each. In the present study, eight clones of monoclonal antibodies against native protein 1 were prepared and their respective epitopes were immunochemically and immunohistochemically characterized using nativ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.1999.098
更新日期:1999-06-01 00:00:00
abstract::Circulating blood platelets play a central role in the maintenance of hemostasis. They adhere to subendothelial extracellular matrix proteins that become exposed upon vessel wall damage, which is followed by platelet activation, further platelet recruitment, platelet aggregation and formation of an occlusive, or non-o...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章,评审
doi:10.1515/cclm-2016-0895
更新日期:2017-05-01 00:00:00
abstract::Prolidases I and II were highly purified from human erythrocytes. The effects of various amino acids, MnCl2 and mercaptoethanol, on these two enzymes were investigated. Normal prolidase II was very labile in the absence of MnCl2 or mercaptoethanol. The activity of prolidase II was maintained at about 76% by pre-incuba...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2003.202
更新日期:2003-10-01 00:00:00
abstract::Successful reduction of the risk of viral transmission via blood components has focused attention on the risk of transfusion-associated bacterial sepsis. The incidence of transfusion reactions due to bacteria is currently estimated at between 1 per 100,000 and 1 per 1,000,000 units in the case of packed red blood cell...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章,评审
doi:10.1515/CCLM.2008.151
更新日期:2008-01-01 00:00:00
abstract:BACKGROUND:Ebola virus, an enveloped virus, is the cause of the largest and most complex Ebola virus disease (EVD) outbreak in West Africa. Blood or body fluids of an infected person may represent a biohazard to laboratory workers. Laboratory tests of virus containing specimens should be conducted in referral centres a...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/cclm-2015-0119
更新日期:2015-11-01 00:00:00
abstract::We discovered a hitherto undescribed insertion/deletion (I/D) polymorphism of 7 base pairs in intron 4 of the HP1 allele and intron 4 and 6 of the HP2 allele. Genotyping was performed in 311 Belgian subjects. The association between serum haptoglobin (Hp) and lipid concentrations and the Hp I/D genotypes was investiga...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2002.081
更新日期:2002-05-01 00:00:00
abstract:BACKGROUND:Recently published data identified bone-specific alkaline phosphatase (BALP) as a good marker of bone formation in different bone diseases and osteoporosis. Two methods are available for BALP determination: one measures enzyme activity, the other its mass concentration. We compared results for BALP activity ...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2007.186
更新日期:2007-01-01 00:00:00
abstract::Background Quantification of plasma amino acids is key to the diagnosis of inherited defects of amino acid synthesis, catabolism and transport, many of which present as clinical emergencies. The utility of this test is limited by the long analysis time and subsequent inability of laboratories to provide results in rea...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/cclm-2019-0604
更新日期:2020-04-28 00:00:00
abstract::Primary biliary cholangitis (PBC), also known as primary biliary cirrhosis, is an autoimmune disease of the liver characterized by anti-mitochondrial antibodies (AMA) in 90%-95% of patients. The aim of this study was to evaluate the diagnostic value of several serum biomarkers in patients with PBC but negative for AMA...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章,评审
doi:10.1515/cclm-2017-0249
更新日期:2017-11-27 00:00:00
abstract:BACKGROUND:International recommendations highlight the superior value of cardiac troponins (cTns) for early diagnosis of myocardial infarction along with analytical requirements of improved precision and detectability. In this multicenter study, we investigated the analytical performance of a new high sensitive cardiac...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章,多中心研究
doi:10.1515/cclm-2014-0107
更新日期:2014-11-01 00:00:00
abstract::Overcrowding of the emergency department (ED) is rapidly becoming a global challenge and a major source of concern for emergency physicians. The evaluation of cardiac biomarkers is critical for confirming diagnoses and expediting treatment decisions to reduce overcrowding, however, physicians currently face the dilemm...
journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/cclm-2014-0267
更新日期:2014-10-01 00:00:00