Johanna E. Camara

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IFCC Working Group Recommendations for Assessing Commutability Part 1: General Experimental Design.

Göran Nilsson, Cas Weykamp, Chris Burns, 2018, Clinical chemistry.

Enhancing the accuracy of measurement of small molecule organic biomarkers

Jintana Nammoonnoy, Bei Xu, Lindsey Mackay, 2019, Analytical and Bioanalytical Chemistry.

Expression and characterization of 15N-labeled human C-reactive protein in Escherichia coli and Pichia pastoris for use in isotope-dilution mass spectrometry.

Johanna E. Camara, E. Kilpatrick, W. Liao, 2012, Protein expression and purification.

Take Two: Gearing Up for the Next Vitamin D Commutability Study | NIST

Johanna E. Camara, Andrew N. Hoofnagle, Christopher T. Sempos, 2015 .

Final report on CCQM-K80: Comparison of value-assigned CRMs and PT materials: Creatinine in human serum

Katrice A. Lippa, Blaza Toman, David L. Duewer, 2013 .

An international assessment of the metrological equivalence of higher-order measurement services for creatinine in serum

Katrice A. Lippa, Blaza Toman, David L. Duewer, 2012, Analytical and Bioanalytical Chemistry.

Mass fraction assignment of folic acid in a high purity material

Byung-Joo Kim, Katrice A. Lippa, Anthony Windust, 2018 .

Discrimination between wild-type and ampicillin-resistant Escherichia coli by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

Johanna E. Camara, F. Hays, Johanna Camara, 2007, Analytical and bioanalytical chemistry.

Development of an Improved Standard Reference Material for Vitamin D Metabolites in Human Serum.

Johanna E. Camara, C. Sempos, S. Wise, 2017, Analytical chemistry.

Assessment of serum total 25-hydroxyvitamin D assay commutability of Standard Reference Materials and College of American Pathologists Accuracy-Based Vitamin D (ABVD) Scheme and Vitamin D External Quality Assessment Scheme (DEQAS) materials: Vitamin D Standardization Program (VDSP) Commutability Stu

Johanna E. Camara, C. Sempos, A. Hoofnagle, 2021, Analytical and Bioanalytical Chemistry.

Standardizing 25-hydroxyvitamin D values from the Canadian Health Measures Survey.

Johanna E. Camara, C. Sempos, R. Durazo-Arvizu, 2015, The American journal of clinical nutrition.

Baseline Assessment of 25-Hydroxyvitamin D Assay Performance: A Vitamin D Standardization Program (VDSP) Interlaboratory Comparison Study.

Johanna E. Camara, A. Prentice, G. Goldberg, 2017, Journal of AOAC International.

Stepwise extraction, chemical modification, GC–MS separation, and determination of amino acids in human plasma#

Johanna E. Camara, Jacolin A. Murray, Nino G. Todua, 2018 .

Quantitative determination of disaccharide content in digested unfragmented heparin and low molecular weight heparin by direct-infusion electrospray mass spectrometry.

Johanna E. Camara, B. Nelson, M. Satterfield, 2007, Journal of pharmaceutical and biomedical analysis.

Interlaboratory comparison of 25-hydroxyvitamin D assays: Vitamin D Standardization Program (VDSP) Intercomparison Study 2 — Part 1 liquid chromatography – tandem mass spectrometry (LC-MS/MS) assays — impact of 3-epi-25-hydroxyvitamin D3 on assay performance

Johanna E. Camara, C. Sempos, A. Hoofnagle, 2021, Analytical and Bioanalytical Chemistry.

Vitamin D Standardization Program (VDSP) intralaboratory study for the assessment of 25-hydroxyvitamin D assay variability and bias

Johanna E. Camara, C. Sempos, S. Wise, 2021, Journal of Steroid Biochemistry and Molecular Biology.

Value Assignment of Vitamin D Metabolites in Vitamin D Standardization Program Serum Samples.

Johanna E. Camara, B. Toman, C. Sempos, 2017, Journal of AOAC International.

Interlaboratory comparison of 25-hydroxyvitamin D assays: Vitamin D Standardization Program (VDSP) Intercomparison Study 2 — Part 2 ligand binding assays — impact of 25-hydroxyvitamin D2 and 24R,25-dihydroxyvitamin D3 on assay performance

Johanna E. Camara, C. Sempos, S. Wise, 2021, Analytical and Bioanalytical Chemistry.

Optimizing Available Tools for Achieving Result Standardization: Value Added by Joint Committee on Traceability in Laboratory Medicine (JCTLM).

Johanna E. Camara, M. Panteghini, H. Vesper, 2021, Clinical chemistry.

Interlaboratory Comparison for the Determination of 24,25-Dihydroxyvitamin D₃ in Human Serum Using Liquid Chromatography with Tandem Mass Spectrometry.

Johanna E. Camara, C. Sempos, A. Hoofnagle, 2017, Journal of AOAC International.

Development of an improved standard reference material for folate vitamers in human serum

Johanna E. Camara, S. Wise, K. Lippa, 2022, Analytical and Bioanalytical Chemistry.

Role of the National Institute of Standards and Technology (NIST) in Support of the Vitamin D Initiative of the National Institutes of Health, Office of Dietary Supplements.

Joseph M Betz, Stephen A Wise, Christopher T Sempos, 2017, Journal of AOAC International.

An updated protocol based on CLSI document C37 for preparation of off-the-clot serum from individual units for use alone or to prepare commutable pooled serum reference materials

W Greg Miller, Hubert W Vesper, Gary L Myers, 2019, Clinical chemistry and laboratory medicine.

IFCC Working Group Recommendations for Assessing Commutability Part 2: Using the Difference in Bias between a Reference Material and Clinical Samples.

Johanna E. Camara, J. Budd, M. Panteghini, 2018, Clinical chemistry.

Development of a Standard Reference Material for metabolomics research.

Catherine A Rimmer, Nien-Fan Zhang, Bryant C Nelson, 2013, Analytical chemistry.

Assessment of serum total 25-hydroxyvitamin D assays for Vitamin D External Quality Assessment Scheme (DEQAS) materials distributed at ambient and frozen conditions

Johanna E. Camara, C. Sempos, A. Hoofnagle, 2021, Analytical and Bioanalytical Chemistry.

Establishing an Accuracy Basis for the Vitamin D External Quality Assessment Scheme (DEQAS).

Joseph M Betz, Stephen A Wise, Christopher T Sempos, 2017, Journal of AOAC International.

Baseline Assessment of 25-Hydroxyvitamin D Reference Material and Proficiency Testing/External Quality Assurance Material Commutability: A Vitamin D Standardization Program Study.

Joseph M Betz, W Greg Miller, Kurtis Sarafin, 2017, Journal of AOAC International.

General Steps to Standardize the Laboratory Measurement of Serum Total 25-Hydroxyvitamin D.

Joseph M Betz, Andy Liu, Kurtis Sarafin, 2017, Journal of AOAC International.

Determination of 24,25-Dihydroxyvitamin D3 [24,25(OH)2D3] in Archived Vitamin D External Quality Assessment Scheme (DEQAS) Samples using a Reference Measurement Procedure with Comparison to DEQAS Participant Results and Assessment of Contribution of 24,25(OH)2D3 to DEQAS Assay Results.

Johanna E. Camara, C. Sempos, S. Wise, 2023, The Journal of steroid biochemistry and molecular biology.

Health Assessment Measurements Quality Assurance Program: Exercise 5 Final Report

Johanna E. Camara, Jacolin A. Murray, B. Benner, 2018 .

IFCC Working Group Recommendations for Correction of Bias Caused by Noncommutability of a Certified Reference Material Used in the Calibration Hierarchy of an End-User Measurement Procedure.

Cas Weykamp, W Greg Miller, Ferruccio Ceriotti, 2020, Clinical chemistry.

IFCC Working Group Recommendations for Assessing Commutability Part 3: Using the Calibration Effectiveness of a Reference Material.

Cas Weykamp, W Greg Miller, Ferruccio Ceriotti, 2018, Clinical chemistry.

Determination of fortified and endogenous folates in food-based Standard Reference Materials by liquid chromatography-tandem mass spectrometry

Johanna E. Camara, M. Lowenthal, K. Phinney, 2013, Analytical and Bioanalytical Chemistry.

Standard Reference Material (SRM) 2378 fatty acids in frozen human serum. Certification of a clinical SRM based on endogenous supplementation of polyunsaturated fatty acids

Johanna E. Camara, B. Benner, R. Schleicher, 2018, Analytical and Bioanalytical Chemistry.