Abstract：
OBJECTIVES:During the development of a testosterone assay by LC-MS/MS, we encountered significant assay interference introduced by blood collection tubes. We examined a number of commonly used blood collection tubes for the presence of interference and its impact on testosterone quantitation. DESIGN AND METHODS:A number of commonly used blood collection tubes were examined by incubation of zero, low and high testosterone concentration samples with them over time, followed by sample preparation using liquid-liquid extraction and analysis by LC-MS/MS. Source of interference was identified by separately incubating blood collection tube coating, stopper and separator gel in clean glass tubes containing zero calibrator. RESULTS:Significant interference was found in some blood collection tubes, with the separator gel identified as the main source. The magnitude of the interference increases over time and mainly affected one of the two testosterone mass transitions used in the quantitation, making it readily detected by the discrepant results obtained by each of the two testosterone mass transitions. We were unable to eliminate the interference by adjustment of the sample preparation procedure, and by changing LC or MS parameters. Accurate quantitation of testosterone is possible when the problematic tubes are avoided, and blood collection tubes free of interference are used instead. CONCLUSIONS:Significant LC-MS/MS testosterone assay interference that originated from certain type of blood collection tubes hampered testosterone analysis. Examination of blood collection tube and any other laboratory test tubes for interference should therefore be an integral part of the development and validation of any LC-MS/MS assay used in a clinical diagnostic laboratory.
journal_name
Clin Biochemjournal_title
Clinical biochemistryauthors
Shi RZ,van Rossum HH,Bowen RAdoi
10.1016/j.clinbiochem.2012.08.008subject
Has Abstractpub_date
2012-12-01 00:00:00pages
1706-9issue
18eissn
0009-9120issn
1873-2933pii
S0009-9120(12)00466-3journal_volume
45pub_type
杂志文章abstract：OBJECTIVES:An increased level of serum vascular adhesion protein-1 (VAP-1) has been found in patients with diabetes mellitus and vascular disorders. This study examined whether serum VAP-1 levels are associated with chronic kidney disease (CKD). DESIGN AND METHODS:We included 262 subjects aged 30 and above with fastin...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2008.06.019
更新日期：2008-11-01 00:00:00
abstract：:1. We compare the Roche ion-exchange column chromatography and the Merck antibody inhibition reaction for CK-MB fractionation in 51 sera. Measurements of total CK and CK-MB activities must be done under the same conditions for each method in order to correlate the results. 2. A decisional value must be used for the in...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(79)80139-3
更新日期：1979-08-01 00:00:00
abstract：OBJECTIVES:Studies from both experimental animals and humans suggest that administration of exogenous DHEA may have beneficial endocrine-metabolic, immunologic and neurologic effects. Several groups have administered DHEA to humans, but to the best of our knowledge, no one at this point has published a summary of the r...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(99)00021-1
更新日期：1999-07-01 00:00:00
abstract：:The influence of age and disease on serum albumin and alpha-1-acid glycoprotein was studied in 126 subjects (69 M, 57 F) presenting with tuberculosis and after recovery. Albumin concentration fell with age in both disease and healthy states, and alpha-1-acid glycoprotein concentration rose with age in the healthy stat...
journal_title：Clinical biochemistry
pub_type： 临床试验,杂志文章
doi：10.1016/0009-9120(94)90032-9
更新日期：1994-08-01 00:00:00
abstract：:Comparison of the turbidimetric immunoassay of haptoglobin with a reference method (the RID technique with appropriate correction for phenotype) clearly showed the turbidimetric assay to be phenotype-dependent. Correction factors for the three main phenotypes were calculated and reference values determined. The observ...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(87)80006-1
更新日期：1987-08-01 00:00:00
abstract：OBJECTIVES:Current extraction methods for cobalamins from serum influence the molecular characteristics of the vitamin. Therefore, an extraction procedure that leaves the cobalamins unchanged is needed. DESIGN AND METHODS:Monoclonal antibodies towards transcobalamin (TC) and haptocorrin (HC) (in house) linked to magne...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2007.09.008
更新日期：2007-12-01 00:00:00
abstract：OBJECTIVES:Pediatric serum samples collected from healthy children in the CALIPER (Canadian Laboratory Initiative in Pediatric Reference Interval) project are stored at -80 °C for various periods of time. This study aimed to determine the stability of chemistry, protein, and hormone analytes under these conditions. DE...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2012.03.029
更新日期：2012-07-01 00:00:00
abstract：:A highly specific enzyme-linked "sandwich" immunoassay was developed for determining cardiac myosin light chain II (MLC II) in serum by using an anticardiac MLC II monoclonal antibody and a solid phase consisting of glass rods coated with another monoclonal antibody. We can detect as little as 0.2 ng of cardiac MLC II...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(90)80042-h
更新日期：1990-12-01 00:00:00
abstract：OBJECTIVE:We used single-strand conformational polymorphism (SSCP). To screen for mutations/polymorphisms in exon 4 of the apolipoprotein C III in 45 patients with hypertriglyceridemia and 46 control individuals, single-strand conformational polymorphism was investigated using restriction endonuclease and amplification...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(94)00083-8
更新日期：1995-06-01 00:00:00
abstract：OBJECTIVES:Humoral immune response to SARS-CoV-2 infection has been reported in several patient cohorts with results that vary by method and population studied due to the lack of reliable commercial assays available as the pandemic initially spread. We sought to clinically assess commercial prototype SARS-CoV-2 IgG and...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2020.08.008
更新日期：2020-12-01 00:00:00
abstract：OBJECTIVE:Mycophenolic acid requires routine therapeutic drug monitoring. We evaluated the suitability of a new PETINIA (particle enhanced turbidimetric inhibition immunoassay) assay on the Dimension EXL analyzer for monitoring of mycophenolic acid by comparing values obtained by this assay with a HPLC-UV method. DESI...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2012.11.025
更新日期：2013-05-01 00:00:00
abstract：OBJECTIVES:The relative proportion in percentage of the isoenzyme A of beta-hexosaminidase (Hex) is the single discriminatory function most frequently used for the biochemical screening of heterozygote Tay-Sachs disease carriers. It has been suggested that the assay of the Hex isoenzymes in homogeneous cell preparation...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2005.05.016
更新日期：2005-10-01 00:00:00
abstract：OBJECTIVES:To monitor increases or decreases in cardiovascular disease (CVD)-related proteins that will be released from the deposits or plaque on the inner wall of blood vessels. DESIGN AND METHODS:Protein profiles of sera from healthy subjects and CVD patients were determined via 2-DE. Differentially expressed spots...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2010.09.027
更新日期：2011-02-01 00:00:00
abstract：OBJECTIVE:In this study, we determined the assay performance criteria necessary to produce acceptable results for >or=98% of neonate bilirubin samples collected by capillary heel-stick. STUDY DESIGN AND METHODS:We determined serum free hemoglobin levels in 151 heel-stick serum samples to determine the hemolysis level....
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2007.08.003
更新日期：2007-11-01 00:00:00
abstract：OBJECTIVES:Despite the evidence that both homocysteine and cysteine are important risk factors for vascular disease and atherosclerosis no information are reported about their effective amount in plaque and on the relationship with the other low molecular weight thiols. DESIGN AND METHODS:We used capillary electrophor...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2009.02.007
更新日期：2009-06-01 00:00:00
abstract：:Drug therapy may produce toxicity. Patient individuality or drug interactions account for many cases of poisoning, but other factors such as genetic predisposition, drug contamination or human error are also known causes. Examples of various types of drug poisoning are given, illustrating the role of the clinical chem...
journal_title：Clinical biochemistry
pub_type： 杂志文章,评审
doi：10.1016/0009-9120(90)90507-q
更新日期：1990-02-01 00:00:00
abstract：OBJECTIVES:Although monitoring of cyclosporin (CsA) is standard clinical practice postrenal transplantation, mycophenolic acid (MPA) concentrations are not routinely measured. There is evidence that a relationship exists between MPA area under the concentration-time curve (AUC) and rejection. In this study, a retrospec...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(00)00196-x
更新日期：2001-02-01 00:00:00
abstract：OBJECTIVES:Preeclampsia, the most common pregnancy-associated pathological syndrome, is accompanied by significant remodelling of the extracellular matrix and alteration in lipid composition of the umbilical cord artery (UCA). DESIGN AND METHODS:We evaluate the sphingolipid composition of UCA and its alteration in pre...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2009.07.011
更新日期：2009-11-01 00:00:00
abstract：:1. A procedure for the assay of triglycerides on the ABA-50 is described. 2. The Boehringer Mannheim Triglyceride (Fully Enzymatic method) reagent kit has been evaluated with this method and was found to be satisfactory. ...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(77)93190-3
更新日期：1977-12-01 00:00:00
abstract：OBJECTIVES:The International Federation of Clinical Chemistry (IFCC) initiated a pilot study, with cortisol as an example, that aims to implement the concept of standardization of hapten immunoprocedures on the basis of metrological traceability. In fact, this standardization concept comes down to correct calibration o...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/s0009-9120(98)00037-x
更新日期：1998-08-01 00:00:00
abstract：:During sequential physiologic maturation of an individual follicle, the number of granulosa cells increases in excess of 1000-fold, while intra-ovarian concentrations of sex steroids escalate by 100-fold. The recent development of several in vitro ovarian systems has permitted a more extensive and direct assessment of...
journal_title：Clinical biochemistry
pub_type： 杂志文章,评审
doi：10.1016/s0009-9120(81)90976-0
更新日期：1981-10-01 00:00:00
abstract：:Children whose parents had early coronary heart disease were investigated. In order to assess high-risk parameters serum total cholesterol (TC), total triglyceride (TT), high-density lipoprotein cholesterol (HDLC), low-density lipoprotein cholesterol (LDLC), lipid peroxide (LP), prostacyclin (PGI2), thromboxane (TX) l...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/0009-9120(91)90541-l
更新日期：1991-04-01 00:00:00
abstract：OBJECTIVES:We tested the application of bioinformatic algorithms in studying the metabolomic profiles of neonatal urine samples with clinical evidence of severe asphyxia at birth and subsequent neurodevelopmental handicap. DESIGN AND METHODS:The clinical outcomes of 256 newborns that required direct admission to neona...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2006.01.006
更新日期：2006-03-01 00:00:00
abstract：INTRODUCTION:Bisalbuminemia is a genetic condition in which an albumin variant is found in serum in addition to normal albumin. METHODS AND MATERIALS:Serum protein electrophoresis using the Sebia HYDRASYS electrophoresis system was performed on an 84 year old male. RESULTS:Serum protein electrophoresis showed a singl...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2011.10.005
更新日期：2012-01-01 00:00:00
abstract：BACKGROUND:Single biomarker approaches provide only moderate accuracy in the non-invasive detection of exercise-induced myocardial ischemia. We therefore assessed the combination of the two most promising single biomarkers: high-sensitivity cardiac troponin I (hs-cTnI) and B-type natriuretic peptide (BNP). METHODS:Con...
journal_title：Clinical biochemistry
pub_type： 临床试验,杂志文章
doi：10.1016/j.clinbiochem.2017.10.014
更新日期：2018-02-01 00:00:00
abstract：OBJECTIVES:The glutathione S-transferases (GSTs) play a critical role in protecting the colorectal mucosa. We investigated the efficacy of using the GSTs activity of plasma as a biomarker of risk for colorectal cancer. METHODS:GSTs activity was measured in the plasma of control individuals (n=39) and in the plasma, tu...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2005.04.004
更新日期：2005-07-01 00:00:00
abstract：OBJECTIVES:The aim of this study was to determine the reference values for serum cystatin C (CysC) with a particular focus on the effect of aging. DESIGN AND METHODS:The study was performed on a consecutive series of subjects (258 men and 396 women). Laboratory parameters and a detailed personal and family medical his...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2006.03.017
更新日期：2006-06-01 00:00:00
abstract：OBJECTIVES:To develop a method for the determination of succinylacetone (SA) in dried blood spots (DBS) using tandem mass spectrometry (MS/MS). METHODS:SA was extracted from DBS with an acetonitrile and water solution (80:20 by volume) containing formic acid and hydrazine hydrate (both at 0.1% by volume), and analyzed...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2004.07.006
更新日期：2004-11-01 00:00:00
abstract：:Ischemic heart disease is the primary cause of death worldwide. The pathophysiological process of cardiovascular diseases is linked to atheromatous plaque formation, while plaque rupture releases thrombogenic elements, which lead to activation of platelets, blood clotting and formation of thrombi. Platelet inhibitors ...
journal_title：Clinical biochemistry
pub_type： 杂志文章,评审
doi：10.1016/j.clinbiochem.2014.03.005
更新日期：2014-05-01 00:00:00
abstract：OBJECTIVES:This study aims to report a hitherto un-described α-globin gene triplicated allele with a novel hemoglobin (Hb) variant on α2-globin gene, Hb St.Luke's-Thailand [α95(G2)Pro-Arg]. DESIGNS AND METHODS:A study was done on a 1.5-year-old Thai boy who showed pallor and jaundice after birth. Hb analysis was perfo...
journal_title：Clinical biochemistry
pub_type： 杂志文章
doi：10.1016/j.clinbiochem.2013.01.022
更新日期：2013-05-01 00:00:00
