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Items: 33


Higher degree of glycation of hemoglobin S compared to hemoglobin A measured by mass spectrometry: Potential impact on HbA1c testing.

Kabytaev K, Connolly S, Rohlfing CL, Sacks DB, Stoyanov AV, Little RR.

Clin Chim Acta. 2016 Jul 1;458:40-3. doi: 10.1016/j.cca.2016.04.027. Epub 2016 Apr 22.


Two-step ion-exchange chromatographic purification combined with reversed-phase chromatography to isolate C-peptide for mass spectrometric analysis.

Kabytaev K, Durairaj A, Shin D, Rohlfing CL, Connolly S, Little RR, Stoyanov AV.

J Sep Sci. 2016 Feb;39(4):676-81. doi: 10.1002/jssc.201500989. Epub 2016 Jan 28.


Assessing quality from an accuracy-based HbA1c proficiency survey.

Little RR, Rohlfing CL.

Clin Chem Lab Med. 2016 Mar;54(3):e75-6. doi: 10.1515/cclm-2015-0972. No abstract available.


Effects of 49 Different Rare Hb Variants on HbA1c Measurement in Eight Methods.

Little RR, La'ulu SL, Hanson SE, Rohlfing CL, Schmidt RL.

J Diabetes Sci Technol. 2015 Jul;9(4):849-56. doi: 10.1177/1932296815572367. Epub 2015 Feb 17.


Comparing analytic performance criteria: evaluation of HbA1c certification criteria as an example.

Rohlfing CL, Parvin CA, Sacks DB, Little RR; NGSP Steering Committee.

Clin Chim Acta. 2014 Jun 10;433:259-63. doi: 10.1016/j.cca.2014.03.034. Epub 2014 Apr 8.


Isotope dilution assay in peptide quantification: the challenge of microheterogeneity of internal standard.

Stoyanov AV, Rogatsky E, Stein D, Connolly S, Rohlfing CL, Little RR.

Proteomics Clin Appl. 2013 Dec;7(11-12):825-8. doi: 10.1002/prca.201200130. Epub 2013 Oct 18.


Measurement of Hba(1C) in patients with chronic renal failure.

Little RR, Rohlfing CL, Tennill AL, Hanson SE, Connolly S, Higgins T, Wiedmeyer CE, Weykamp CW, Krause R, Roberts W.

Clin Chim Acta. 2013 Mar 15;418:73-6. doi: 10.1016/j.cca.2012.12.022. Epub 2013 Jan 12.


The long and winding road to optimal HbA1c measurement.

Little RR, Rohlfing CL.

Clin Chim Acta. 2013 Mar 15;418:63-71. doi: 10.1016/j.cca.2012.12.026. Epub 2013 Jan 11. Review.


Human C-peptide Quantitation by LC-MS Isotope-Dilution Assay in Serum or Urine Samples.

Stoyanov AV, Connolly S, Rohlfing CL, Rogatsky E, Stein D, Little RR.

J Chromatogr Sep Tech. 2013;4(3). pii: 172. doi: 10.4172/2157-7064.1000172. Epub 2013 Mar 27.


The effect of increased fetal hemoglobin on 7 common Hb A1c assay methods.

Little RR, Rohlfing CL, Hanson SE, Schmidt RL, Lin CN, Madsen RW, Roberts WL.

Clin Chem. 2012 May;58(5):945-7. doi: 10.1373/clinchem.2012.181933. Epub 2012 Feb 22. No abstract available.


Effects of hemoglobin C, D, E, and S traits on measurements of HbA1c by six methods.

Lin CN, Emery TJ, Little RR, Hanson SE, Rohlfing CL, Jaisson S, Gillery P, Roberts WL.

Clin Chim Acta. 2012 Apr 11;413(7-8):819-21. doi: 10.1016/j.cca.2011.12.019. Epub 2012 Jan 8. No abstract available.


Use of cation exchange chromatography for human C-peptide isotope dilution - mass spectrometric assay.

Stoyanov AV, Rohlfing CL, Connolly S, Roberts ML, Nauser CL, Little RR.

J Chromatogr A. 2011 Dec 23;1218(51):9244-9. doi: 10.1016/j.chroma.2011.10.080. Epub 2011 Nov 2.


Effects of whole blood storage on hemoglobin a1c measurements with five current assay methods.

Rohlfing CL, Hanson S, Tennill AL, Little RR.

Diabetes Technol Ther. 2012 Mar;14(3):271-5. doi: 10.1089/dia.2011.0136. Epub 2011 Oct 27.


Point-of-care assays for hemoglobin A(1c): is performance adequate?

Little RR, Lenters-Westra E, Rohlfing CL, Slingerland R.

Clin Chem. 2011 Sep;57(9):1333-4. doi: 10.1373/clinchem.2011.165019. Epub 2011 Jun 28. No abstract available.


Analytical goals for HbA1c: are HbA1c results good enough for optimal use?

Little RR, Rohlfing CL.

J Diabetes. 2011 Mar;3(1):3-6. doi: 10.1111/j.1753-0407.2010.00109.x. No abstract available.


Status of hemoglobin A1c measurement and goals for improvement: from chaos to order for improving diabetes care.

Little RR, Rohlfing CL, Sacks DB; National Glycohemoglobin Standardization Program (NGSP) Steering Committee.

Clin Chem. 2011 Feb;57(2):205-14. doi: 10.1373/clinchem.2010.148841. Epub 2010 Dec 9. Review.


Effects of hemoglobin C and S traits on Tosoh G8 and Siemens Advia HbA1c assays.

Little RR, Rohlfing CL, Hanson SE, Roberts WL.

Clin Chim Acta. 2010 May 2;411(9-10):779-80. doi: 10.1016/j.cca.2010.02.012. Epub 2010 Feb 19. No abstract available.


Effects of hemoglobin (Hb) E and HbD traits on measurements of glycated Hb (HbA1c) by 23 methods.

Little RR, Rohlfing CL, Hanson S, Connolly S, Higgins T, Weykamp CW, D'Costa M, Luzzi V, Owen WE, Roberts WL.

Clin Chem. 2008 Aug;54(8):1277-82. doi: 10.1373/clinchem.2008.103580. Epub 2008 Jun 12.


Effects of hemoglobin C and S traits on the results of 14 commercial glycated hemoglobin assays.

Mongia SK, Little RR, Rohlfing CL, Hanson S, Roberts RF, Owen WE, D'Costa MA, Reyes CA, Luzzi VI, Roberts WL.

Am J Clin Pathol. 2008 Jul;130(1):136-40. doi: 10.1309/1YU0D34VJKNUCGT1.


The effect of elevated fetal hemoglobin on hemoglobin A1c results: five common hemoglobin A1c methods compared with the IFCC reference method.

Rohlfing CL, Connolly SM, England JD, Hanson SE, Moellering CM, Bachelder JR, Little RR.

Am J Clin Pathol. 2008 May;129(5):811-4. doi: 10.1309/YFVTUD0GHJF7D16H.


Standardization of C-peptide measurements.

Little RR, Rohlfing CL, Tennill AL, Madsen RW, Polonsky KS, Myers GL, Greenbaum CJ, Palmer JP, Rogatsky E, Stein DT.

Clin Chem. 2008 Jun;54(6):1023-6. doi: 10.1373/clinchem.2007.101287. Epub 2008 Apr 17.


Effects of sample storage conditions on glycated hemoglobin measurement: evaluation of five different high performance liquid chromatography methods.

Little RR, Rohlfing CL, Tennill AL, Connolly S, Hanson S.

Diabetes Technol Ther. 2007 Feb;9(1):36-42.


Effects of hemoglobin C and S traits on glycohemoglobin measurements by eleven methods.

Roberts WL, Safar-Pour S, De BK, Rohlfing CL, Weykamp CW, Little RR.

Clin Chem. 2005 Apr;51(4):776-8. Epub 2005 Feb 3. No abstract available.


Validation by a mass spectrometric reference method of use of boronate affinity chromatography to measure glycohemoglobin in the presence of hemoglobin S and C traits.

Little RR, Vesper H, Rohlfing CL, Ospina M, Safar-Pour S, Roberts WL.

Clin Chem. 2005 Jan;51(1):264-5. Epub 2004 Nov 24. No abstract available.


Effects of beta thalassemia minor on results of six glycated hemoglobin methods.

Polage C, Little RR, Rohlfing CL, Cole TG, Roberts WL.

Clin Chim Acta. 2004 Dec;350(1-2):123-8.


The importance of precision for hemoglobin A1c measurement.

Little RR, Rohlfing CL.

Diabetes Technol Ther. 2003;5(6):979-81. No abstract available.


Defining the relationship between plasma glucose and HbA(1c): analysis of glucose profiles and HbA(1c) in the Diabetes Control and Complications Trial.

Rohlfing CL, Wiedmeyer HM, Little RR, England JD, Tennill A, Goldstein DE.

Diabetes Care. 2002 Feb;25(2):275-8.


The national glycohemoglobin standardization program: a five-year progress report.

Little RR, Rohlfing CL, Wiedmeyer HM, Myers GL, Sacks DB, Goldstein DE; NGSP Steering Committee.

Clin Chem. 2001 Nov;47(11):1985-92.


Use of GHb (HbA1c) in screening for undiagnosed diabetes in the U.S. population.

Rohlfing CL, Little RR, Wiedmeyer HM, England JD, Madsen R, Harris MI, Flegal KM, Eberhardt MS, Goldstein DE.

Diabetes Care. 2000 Feb;23(2):187-91. Erratum in: Diabetes Care 2000 Jun;23(6):876.


Is glycohemoglobin testing useful in diabetes mellitus? Lessons from the diabetes control and complications trial.

Goldstein DE, Little RR, Wiedmeyer HM, England JD, Rohlfing CL, Wilke AL.

Clin Chem. 1994 Aug;40(8):1637-40. Review.


International standardization of glycohemoglobin measurements: practical application.

Little RR, Wiedmeyer HM, England JD, Rohlfing CL, Madsen RW, Goldstein DE, Groetsch H, Draeger E, Dichtl E, Hundt HK, et al.

Clin Chem. 1993 Nov;39(11 Pt 1):2356. No abstract available.


Interlaboratory standardization of measurements of glycohemoglobins.

Little RR, Wiedmeyer HM, England JD, Wilke AL, Rohlfing CL, Wians FH Jr, Jacobson JM, Zellmer V, Goldstein DE.

Clin Chem. 1992 Dec;38(12):2472-8.

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