Marked Underestimation of Serum 25-hydroxyvitamin D Concentrations by The Abbot Architect Chemiluminescent Microparticle Immunoassay in Patients Receiving Vitamin D2 Supplementation

Author(s):  
Nipith Charoenngam ◽  
Michael F. Holick
2012 ◽  
Vol 95 (6) ◽  
pp. 1357-1364 ◽  
Author(s):  
Laura Tripkovic ◽  
Helen Lambert ◽  
Kathryn Hart ◽  
Colin P Smith ◽  
Giselda Bucca ◽  
...  

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Jaydip Ray Chaudhuri ◽  
K. Rukmini Mridula ◽  
Alluri Anamika ◽  
Demudu Babu Boddu ◽  
Pradeep Kumar Misra ◽  
...  

Background. Vitamin D deficiency is widespread throughout the world. Several reports have incriminated vitamin D deficiency as the cause of rickets, osteomalacia, and other chronic diseases. Recent studies have suggested a possible link between deficiency of 25-hydroxyvitamin D and dyslipidemia.Aim. To investigate the association between 25-hydroxyvitamin D deficiency and dyslipidemia in Indian subjects.Methodology. We recruited 150 asymptomatic consecutive subjects from patients’ attendees at the Departments of Neurology and Medicine in Yashoda Hospital, Hyderabad, India. Study period was from October 2011 to March 2012. All subjects underwent 25-hydroxyvitamin D assay by chemiluminescent microparticle immunoassay, fasting blood sugar and lipid profile, calcium, phosphorus, alkaline phosphatase, and C-reactive protein (CRP).Results. Out of 150 subjects, men were 82 (54.6%), and mean age was 49.4 (±15.6) years. Among risk factors, hypertension was noted in 63/150 (42%), 25-hydroxyvitamin D deficiency in 59/150 (39.3%), diabetes in 45/150 (30%), dyslipidemia in 60 (40%), smoking in 35/150 (23.3%), and alcoholism in 27/150 (18%). Deficiency of 25-hydroxyvitamin D was significantly associated with dyslipidemia (P=0.0001), mean serum glucose (P=0.0002) mean CRP (P=0.04), and mean alkaline phosphatase (P=0.01). Multivariate analysis showed that 25-hydroxyvitamin D deficiency was independently associated with dyslipidemia (odds ratio: 1.9; 95% CI : 1.1–3.5).Conclusions. We found that deficiency of 25-hydroxyvitamin D was independently associated with dyslipidemia in Indian subjects.


2010 ◽  
Vol 163 (6) ◽  
pp. 965 ◽  
Author(s):  
Guri Grimnes ◽  
Bjørg Almaas ◽  
Anne Elise Eggen ◽  
Nina Emaus ◽  
Yngve Figenschau ◽  
...  

The authors and the journal apologise for errors in the Introduction section of this paper published in the European Journal of Endocrinology 2010 vol 163 pp 339–348. Lines 11–14 of the Introduction section should read as follows:This reflects the amount of vitamin D ingested from food (ergocalciferol (vitamin D2) or cholecalciferol (vitamin D3)) and the amount of vitamin D produced in the skin during ultraviolet B (UVB) exposure (vitamin D3)and not as published.


Endocrinology ◽  
2016 ◽  
Vol 157 (9) ◽  
pp. 3420-3430 ◽  
Author(s):  
Rene F. Chun ◽  
Ivan Hernandez ◽  
Renata Pereira ◽  
Leon Swinkles ◽  
Tonnie Huijs ◽  
...  

25-Hydroxyvitamin D (25D) circulates bound primarily to serum vitamin D binding protein (DBP), with DBP showing higher binding affinity for 25D3 than 25D2. We therefore hypothesized that vitamin D2 (D2) promotes higher serum levels of unbound 25D (free 25D), with different functional responses, relative to vitamin D3 (D3). Week 3 C56BL/6 mice were placed on diets containing either D2 or D3 alone (both 1000 IU/kg). At week 8 and week 16, D2 mice had only 25D2 in circulation (26.6 ± 1.9 and 33.3 ± 4.4 ng/mL), and D3 mice had only 25D3 (28.3 ± 2.0 and 31.7 ± 2.1 ng/mL). At week 8 (44.5 ± 6.4 vs 62.4 ± 11.6 pg/mL, P < .05) and week 16 (78.4 ± 12.6 vs 95.5 ± 11.6), D2 mice had lower serum 1,25-dihydroxyvitamin D relative to D3 mice. By contrast, measured free 25D was significantly higher in D2 mice at week 8 (16.8 ± 0.65 vs 8.4 ± 0.63 pg/mL, P < .001) and week 16 (17.4 ± 0.43 vs 8.4 ± 0.44, P < .001). A two-way ANOVA of bone histomorphometry showed that week 8 D2 mice had significantly higher osteoclast surface/bone surface, eroded surface/bone surface, and mineral apposition rate compared with D3 mice. Osteoblast surface/bone surface was higher in week 8 D2 females but not week 8 D2 males. At week 16, D2 mice had significantly higher bone volume/total volume and trabecular number compared with D3 mice. Differences in bone phenotype were observed despite D2 mice reaching similar serum 25D levels and lower 1,25D levels compared with D3 mice. These data indicate that 25D2 binds less well to DBP than 25D3, with resulting higher levels of free 25D promoting differential effects on bone in mice exposed to D2 alone.


2008 ◽  
Vol 93 (3) ◽  
pp. 677-681 ◽  
Author(s):  
Michael F. Holick ◽  
Rachael M. Biancuzzo ◽  
Tai C. Chen ◽  
Ellen K. Klein ◽  
Azzie Young ◽  
...  

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