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Cortisol Measurements in Cushing's Syndrome: Immunoassay or Mass Spectrometry?

Casals G, Hanzu FA

Determination of cortisol levels in the urine (24 hours urine free cortisol), saliva (late-night), or serum (total cortisol after dexamethasone suppression) is recommended to screen for Cushing's syndrome (CS). This...
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Application of the Whole Genome-Based Bacterial Identification System, TrueBac ID, Using Clinical Isolates That Were Not Identified With Three Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) Systems

Ha SM, Kim CK, Roh J, Byun JH, Yang SJ, Choi SB, Chun J, Yong D

BACKGROUND: Next-generation sequencing is increasingly used for taxonomic identification of pathogenic bacterial isolates. We evaluated the performance of a newly introduced whole genome-based bacterial identification system, TrueBac ID (ChunLab Inc.,...
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Simultaneous quantification of ticagrelor and its active metabolite, AR-C124910XX, in human plasma by liquid chromatography-tandem mass spectrometry: Applications in steady-state pharmacokinetics in patients

Chae SU, Min KL, Lee CB, Huang Z, Chang MJ, Bae SK

A sensitive and simple liquid chromatography-tandem mass spectrometry method was developed and validated for the simultaneous quantification of ticagrelor and its active metabolite, AR-C124910XX from 50 µL human plasma using...
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Clinical efficacy of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry in patients with multidrug-resistant bacteremia: a single-center study in Korea

Mok J, Jo EJ, Eom JS, Kim MH, Kim KU, Park HK, Lee MK, Lee K

BACKGROUND/AIMS: Matrix-assisted laser desorption/ionization time-of-f light mass spectrometry (MALDI-TOF MS) is a new diagnostic tool for microorganism identification. The clinical usefulness of this approach has not been widely examined in...
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Use of Liquid Chromatography-Tandem Mass Spectrometry for Clinical Testing in Korean Laboratories: a Questionnaire Survey

Chae H, Cho SE, Park HD, Chun S, Lee YW, Yun YM, Song SH, Lee SG, Lee K, Song J, Lee SY, On behalf of the Clinical Mass Spectrometry Research Committee of Korean Society of Clinical Chemistry

BACKGROUND: The use of liquid chromatography-tandem mass spectrometry (LC-MS/MS) has substantially increased in clinical laboratories worldwide. To assess the status of clinical LC-MS/MS testing in Korean laboratories, a questionnaire survey...
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A Multiplex Phytosterol Assay Utilizing Gas Chromatography-Mass Spectrometry for Diagnosis of Inherited Lipid Storage Disorders

Lee JH, Lee K, Jun SH, Song SH, Shin CH, Song J

No abstract available.
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Comparison of Six Automated Immunoassays With Isotope-Diluted Liquid Chromatography-Tandem Mass Spectrometry for Total Thyroxine Measurement

Yu S, Zhou W, Cheng X, Meng Q, Li H, Hou L, Lu J, Xie S, Cheng Q, Zhang C, Qiu L

BACKGROUND: Accurate serum total thyroxine (TT4) measurement is important for thyroid disorder diagnosis and management. We compared the performance of six automated immunoassays with that of isotope-diluted liquid chromatography-tandem mass...
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Dried Blood Spot Multiplexed Steroid Profiling Using Liquid Chromatography Tandem Mass Spectrometry in Korean Neonates

Choi R, Park HD, Oh HJ, Lee K, Song J, Lee SY

BACKGROUND: Screening for congenital adrenal hyperplasia (CAH) using immunoassays for 17α-hydroxyprogesterone generates many false-positive results. We developed and validated a liquid chromatography-tandem mass spectrometry (LC-MS/MS) assay for simultaneous quantification of...
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Comparison of the Plasma Metabolome Profiles Between the Internal Thoracic Artery and Ascending Aorta in Patients Undergoing Coronary Artery Bypass Graft Surgery Using Gas Chromatography Time-of-Flight Mass Spectrometry

Kim JS, Kim AH, Jang C, Jang IJ, Kim KB, Cho JY, Hwang HY

BACKGROUND: The left internal thoracic artery (LITA) has been used as the first conduit of choice in coronary artery bypass grafting (CABG) because of excellent long-term patency and outcomes. However,...
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Quantification of apixaban in human plasma using ultra performance liquid chromatography coupled with tandem mass spectrometry

Jeong HC, Kim TE, Shin KH

Apixaban, an inhibitor of direct factor Xa, is used for the treatment of venous thromboembolic events or prevention of stroke. Unlike many other anticoagulant agents, it does not need periodic...
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Measurement of Succinylacetone Using HPLC-Tandem Mass Spectrometry and Establishment of a Cut-off Value

Jun SH, Seo JD, Lee K, Song J

BACKGROUND: Newborn screening of tyrosinemia type 1 is important for identifying infants at risk for developing this disease before life-threatening symptoms occur. It is difficult to differentiate between tyrosinemia type...
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Profiling of Serum Metabolites Using MALDI-TOF and Triple-TOF Mass Spectrometry to Develop a Screen for Ovarian Cancer

Lee JH, Kim YH, Kim KH, Cho JY, Woo SM, Yoo BC, Kim SC

PURPOSE: We sought to develop a matrix assisted laser desorption ionization-time of flight (MALDI-TOF)-based, ovarian cancer (OVC), low-mass-ion discriminant equation (LOME) and to evaluate a possible supportive role for triple-TOF...
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Determination of donepezil in human plasma using ultra performance liquid chromatography-tandem mass spectrometry

Jeong HC, Park JE, Hyun JY, Park MK, Shin DS, Shin KH

An ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was developed and validated for the quantification of donepezil in human plasma. Donepezil and donepezil-D4 were extracted from human plasma by...
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Development and validation of analytical method for the determination of radotinib in human plasma using liquid chromatography-tandem mass spectrometry

Seo HB, Cho S, Yoon YR, Yim DS

This study describes the development of an analytical method to determine radotinib levels in human plasma using high performance liquid chromatography (HPLC) coupled with triple quadrupole tandem mass spectrometry (MS/MS)...
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Performance of Matrix-Assisted Laser Desorption Ionization Time-of-Fight Mass Spectrometry for Rapid Discrimination of Methicillin-Resistant Staphylococcus aureus (MRSA): First Report of a Relation Between Protein Peaks and MRSA spa Type

Kwon SS, Hong SK, Kim MS, Yong D, Lee K

No abstract available.
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Comparison of a New Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry Platform, ASTA MicroIDSys, With Bruker Biotyper for Species Identification

Lee Y, Sung JY, Kim H, Yong D, Lee K

Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, with its accuracy and speed, is widely used for bacterial identification. The ASTA MicroIDSys system (ASTA, Korea) was recently developed for species identification. We...
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Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry in Clinical Microbiology: What Are the Current Issues?

van Belkum A, Welker M, Pincus D, Charrier J, Girard V

Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) has revolutionized the identification of microbial species in clinical microbiology laboratories. MALDI-TOF-MS has swiftly become the new gold-standard method owing to...
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Identification of viridans streptococci With Matrix-Assisted Laser Desorption & Ionization Time-of-flight Mass Spectrometry by an In-house Method and a Commercially Available System

Stingu CS, Eschrich K, Thiel J, Borgmann T, Schaumann , Rodloff AC

Two matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS)-based methods were compared for their ability to identify viridans streptococci. One approach employed a reference database and software developed in-house. All...
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Metabolomics Approach to Explore the Effects of Rebamipide on Inflammatory Arthritis Using Ultra Performance Liquid Chromatography/Quadrupole Time-of-Flight Mass Spectrometry

Moon SJ, Lee SH, Jung BH, Min JK

OBJECTIVE: Rebampide is a gastroprotective agent used to treat gastritis. It possesses anti-inflammatory and anti-arthritis effects, but the mechanisms of these effects are not well understood. The objective of this...
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Quantitative Analysis of Eleven Bioactive Constituents of a Traditional Herbal Medicine, Yeonggyechulgam-tang using, Liquid Chromatography-Electrospray Ionization Tandem Mass Spectrometry

Seo CS, Shin HK

This study proposes a sensitive and selective liquid chromatography-electrospray ionization tandem mass spectrometry method of efficiently assessing the quality of a traditional herbal medicine called Yeonggyechulgam-tang (YGCGT). The following compounds...
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