2021
The ALT upper reference interval debate: Blame it on the alcohol
Vera MA, Koch CD, Liapakis A, Lim JK, El-Khoury JM. The ALT upper reference interval debate: Blame it on the alcohol. Clinica Chimica Acta 2021, 526: 62-65. PMID: 34973184, DOI: 10.1016/j.cca.2021.12.026.Peer-Reviewed Original ResearchConceptsUpper reference limitAdult groupHigher upper reference limitLiver diseasePediatric groupPediatric GastroenterologyPediatric populationClinical guidelinesALT valuesAmerican CollegeDerivation studyAge groupsReference limitsNorth American SocietyAmerican SocietyClinical laboratoriesRoche Cobas 8000GastroenterologyLaboratory expertsWomenCobas 8000MenGroupVariable inclusionIndividuals
2020
First- and Second-Trimester Reference Intervals for Thyroid Function Testing in a US Population
Bunch DR, Firmender K, Harb R, El-Khoury JM. First- and Second-Trimester Reference Intervals for Thyroid Function Testing in a US Population. American Journal Of Clinical Pathology 2020, 155: 776-780. PMID: 33210132, DOI: 10.1093/ajcp/aqaa165.Peer-Reviewed Original ResearchConceptsThyroid-stimulating hormoneTrimester-specific reference intervalsThyroid function testsMIU/LPmol/LReference intervalsFunction testsUS populationSecond trimester prenatal screeningRoche analyzersThyroid function testingNegative screening resultsSpecific reference intervalsRoche Modular E170Singleton pregnanciesThyroglobulin antibodiesThyroid dysfunctionFirst trimesterSecond trimesterAdverse outcomesFunction testingFree thyroxineTotal triiodothyronineTotal thyroxineModular E170
2011
A simple and fast liquid chromatography–tandem mass spectrometry method for measurement of underivatized l-arginine, symmetric dimethylarginine, and asymmetric dimethylarginine and establishment of the reference ranges
El-Khoury JM, Bunch DR, Reineks E, Jackson R, Steinle R, Wang S. A simple and fast liquid chromatography–tandem mass spectrometry method for measurement of underivatized l-arginine, symmetric dimethylarginine, and asymmetric dimethylarginine and establishment of the reference ranges. Analytical And Bioanalytical Chemistry 2011, 402: 771-779. PMID: 22124751, DOI: 10.1007/s00216-011-5462-9.Peer-Reviewed Original ResearchConceptsFast liquid chromatography–tandem mass spectrometry methodAnalytical cycle timeChromatography-tandem mass spectrometry methodLiquid chromatography-tandem mass spectrometry methodMinimum sample preparationMass spectrometry methodLiquid chromatography-tandem mass spectrometryChromatography-tandem mass spectrometryAsymmetric dimethylarginineSymmetric dimethylarginineLC-MS/MS methodMass spectrometerFormic acidSpectrometry methodMass spectrometrySilica columnProtein precipitationSample preparationInternal standardAmmonium acetateMS methodGlomerular filtration rateAnalytesNitric oxide synthaseΜM