Measurements of 25-hydroxyvitamin D concentrations in archived dried blood spots are reliable and accurately reflect those in plasma

Alicia K Heath, Elizabeth Jane Williamson, Peter Robert Ebeling, David Kvaskoff, Darryl W Eyles, Dallas R English

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Abstract

Context: Recognition that vitamin D might be associated with many chronic diseases has led to large-scale epidemiological and clinical studies. Dried blood spots (DBS) are a useful resource for these studies. Consequently, accurate, efficient, and inexpensive assays to quantify 25-hydroxyvitamin D (25OHD) in DBS are required. Copyright Objective: This study evaluated the validityandreliability of a liquid chromatography-tandem mass spectrometry assay for measuring 25OHD in archived DBS and compared measurements of 25OHD in DBS with those in plasma. Design and Participants: Sixty-two participants in the Melbourne Collaborative Cohort Study who had plasma and matching DBS stored since study entry in the early 1990s were randomly selected for a study calibrating 25OHD concentrations in DBS with plasma. As part of a study of vitamin D and mortality, cancer, and diabetes, we also assessed the reliability of measurements from DBS using 500 replicates placed randomly within 31 batches run over 15 months. Outcome Measure: 25OHD concentrations were measured by liquid chromatography-tandem mass spectrometry. Results: There was good agreement between measurements of 25OHD from DBS and plasma; R2= 0.73 from a regression of plasma concentration on DBS concentration. The within-batch and between- batch intraclass correlations from the 500 replicate measurements were 0.82 (95 confidence interval, 0.80, 0.85) and 0.73 (95 confidence interval, 0.68, 0.78), respectively. Conclusions: Measuring 25OHD in DBS is a valid and reliable alternative to measuring 25OHD in sera or plasma. A simple calibration model was developed to convert measurements from DBS to equivalent plasma measurements, thus enabling comparisons against clinical reference ranges and with studies using sera or plasma samples.
Original languageEnglish
Pages (from-to)3319 - 3324
Number of pages6
JournalJournal of Clinical Endocrinology and Metabolism
Volume99
Issue number9
DOIs
Publication statusPublished - 2014

Cite this

Heath, Alicia K ; Williamson, Elizabeth Jane ; Ebeling, Peter Robert ; Kvaskoff, David ; Eyles, Darryl W ; English, Dallas R. / Measurements of 25-hydroxyvitamin D concentrations in archived dried blood spots are reliable and accurately reflect those in plasma. In: Journal of Clinical Endocrinology and Metabolism. 2014 ; Vol. 99, No. 9. pp. 3319 - 3324.
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title = "Measurements of 25-hydroxyvitamin D concentrations in archived dried blood spots are reliable and accurately reflect those in plasma",
abstract = "Context: Recognition that vitamin D might be associated with many chronic diseases has led to large-scale epidemiological and clinical studies. Dried blood spots (DBS) are a useful resource for these studies. Consequently, accurate, efficient, and inexpensive assays to quantify 25-hydroxyvitamin D (25OHD) in DBS are required. Copyright Objective: This study evaluated the validityandreliability of a liquid chromatography-tandem mass spectrometry assay for measuring 25OHD in archived DBS and compared measurements of 25OHD in DBS with those in plasma. Design and Participants: Sixty-two participants in the Melbourne Collaborative Cohort Study who had plasma and matching DBS stored since study entry in the early 1990s were randomly selected for a study calibrating 25OHD concentrations in DBS with plasma. As part of a study of vitamin D and mortality, cancer, and diabetes, we also assessed the reliability of measurements from DBS using 500 replicates placed randomly within 31 batches run over 15 months. Outcome Measure: 25OHD concentrations were measured by liquid chromatography-tandem mass spectrometry. Results: There was good agreement between measurements of 25OHD from DBS and plasma; R2= 0.73 from a regression of plasma concentration on DBS concentration. The within-batch and between- batch intraclass correlations from the 500 replicate measurements were 0.82 (95 confidence interval, 0.80, 0.85) and 0.73 (95 confidence interval, 0.68, 0.78), respectively. Conclusions: Measuring 25OHD in DBS is a valid and reliable alternative to measuring 25OHD in sera or plasma. A simple calibration model was developed to convert measurements from DBS to equivalent plasma measurements, thus enabling comparisons against clinical reference ranges and with studies using sera or plasma samples.",
author = "Heath, {Alicia K} and Williamson, {Elizabeth Jane} and Ebeling, {Peter Robert} and David Kvaskoff and Eyles, {Darryl W} and English, {Dallas R}",
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Measurements of 25-hydroxyvitamin D concentrations in archived dried blood spots are reliable and accurately reflect those in plasma. / Heath, Alicia K; Williamson, Elizabeth Jane; Ebeling, Peter Robert; Kvaskoff, David; Eyles, Darryl W; English, Dallas R.

In: Journal of Clinical Endocrinology and Metabolism, Vol. 99, No. 9, 2014, p. 3319 - 3324.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Measurements of 25-hydroxyvitamin D concentrations in archived dried blood spots are reliable and accurately reflect those in plasma

AU - Heath, Alicia K

AU - Williamson, Elizabeth Jane

AU - Ebeling, Peter Robert

AU - Kvaskoff, David

AU - Eyles, Darryl W

AU - English, Dallas R

PY - 2014

Y1 - 2014

N2 - Context: Recognition that vitamin D might be associated with many chronic diseases has led to large-scale epidemiological and clinical studies. Dried blood spots (DBS) are a useful resource for these studies. Consequently, accurate, efficient, and inexpensive assays to quantify 25-hydroxyvitamin D (25OHD) in DBS are required. Copyright Objective: This study evaluated the validityandreliability of a liquid chromatography-tandem mass spectrometry assay for measuring 25OHD in archived DBS and compared measurements of 25OHD in DBS with those in plasma. Design and Participants: Sixty-two participants in the Melbourne Collaborative Cohort Study who had plasma and matching DBS stored since study entry in the early 1990s were randomly selected for a study calibrating 25OHD concentrations in DBS with plasma. As part of a study of vitamin D and mortality, cancer, and diabetes, we also assessed the reliability of measurements from DBS using 500 replicates placed randomly within 31 batches run over 15 months. Outcome Measure: 25OHD concentrations were measured by liquid chromatography-tandem mass spectrometry. Results: There was good agreement between measurements of 25OHD from DBS and plasma; R2= 0.73 from a regression of plasma concentration on DBS concentration. The within-batch and between- batch intraclass correlations from the 500 replicate measurements were 0.82 (95 confidence interval, 0.80, 0.85) and 0.73 (95 confidence interval, 0.68, 0.78), respectively. Conclusions: Measuring 25OHD in DBS is a valid and reliable alternative to measuring 25OHD in sera or plasma. A simple calibration model was developed to convert measurements from DBS to equivalent plasma measurements, thus enabling comparisons against clinical reference ranges and with studies using sera or plasma samples.

AB - Context: Recognition that vitamin D might be associated with many chronic diseases has led to large-scale epidemiological and clinical studies. Dried blood spots (DBS) are a useful resource for these studies. Consequently, accurate, efficient, and inexpensive assays to quantify 25-hydroxyvitamin D (25OHD) in DBS are required. Copyright Objective: This study evaluated the validityandreliability of a liquid chromatography-tandem mass spectrometry assay for measuring 25OHD in archived DBS and compared measurements of 25OHD in DBS with those in plasma. Design and Participants: Sixty-two participants in the Melbourne Collaborative Cohort Study who had plasma and matching DBS stored since study entry in the early 1990s were randomly selected for a study calibrating 25OHD concentrations in DBS with plasma. As part of a study of vitamin D and mortality, cancer, and diabetes, we also assessed the reliability of measurements from DBS using 500 replicates placed randomly within 31 batches run over 15 months. Outcome Measure: 25OHD concentrations were measured by liquid chromatography-tandem mass spectrometry. Results: There was good agreement between measurements of 25OHD from DBS and plasma; R2= 0.73 from a regression of plasma concentration on DBS concentration. The within-batch and between- batch intraclass correlations from the 500 replicate measurements were 0.82 (95 confidence interval, 0.80, 0.85) and 0.73 (95 confidence interval, 0.68, 0.78), respectively. Conclusions: Measuring 25OHD in DBS is a valid and reliable alternative to measuring 25OHD in sera or plasma. A simple calibration model was developed to convert measurements from DBS to equivalent plasma measurements, thus enabling comparisons against clinical reference ranges and with studies using sera or plasma samples.

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U2 - 10.1210/jc.2014-1269

DO - 10.1210/jc.2014-1269

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JO - Journal of Clinical Endocrinology and Metablism

JF - Journal of Clinical Endocrinology and Metablism

SN - 0021-972X

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