- Proficiency testing of 25-hydroxyvitamin D (25-OHD) assaysG D Carter
Clinical Biochemistry, Imperial College Healthcare NHS Trust, Charing Cross Hospital, Fulham Palace Road, London W6 8RF, UK
J Steroid Biochem Mol Biol 121:176-9. 2010..A gas chromatography-mass spectrometry (GC-MS) reference method for 25-OHD is under development and will be used to assess whether the ALTM remains the most appropriate target for DEQAS samples...
- Accuracy of 25-hydroxyvitamin D assays: confronting the issuesGraham D Carter
Imperial College Healthcare NHS Trust, Charing Cross Hospital, London, W6 8RF, UK
Curr Drug Targets 12:19-28. 2011..All 25-OHD assays should be monitored by a proficiency testing scheme and the results made available to clinicians and editors of scientific journals...
- Measurement of Vitamin D metabolites: an international perspective on methodology and clinical interpretationG D Carter
Department of Clinical Chemistry, Charing Cross Hospital, Fulham Palace Road, London W6 8RF, UK
J Steroid Biochem Mol Biol 89:467-71. 2004..Most respondents thought participation in DEQAS extremely important and the planned introduction of on-line reporting should enhance its value...
- The anomalous behaviour of exogenous 25-hydroxyvitamin D in competitive binding assaysG D Carter
Department of Clinical Chemistry, Hammersmith Hospitals NHS Trust, London W6 8RF, UK
J Steroid Biochem Mol Biol 103:480-2. 2007..9, 46.4%, 43.2%, HPLC (n=9); 42.6, 112.2%, 97.1%, LC-MS (n=4); 34.0, 111.5%, 118.1%. The IDS RIA and Nichols assays gave unexpectedly low recoveries. This does not appear to be a calibration problem or the effect of ethanol...