Heaney RP (2000) Vitamin D: how much do we need, and how much is too much? Osteoporos Int 11:553-555
Dawson-Hughes B, Heaney RP, Holick MF, Lips P, Meunier PJ, Vieth R (2005) Estimates of optimal vitamin D status. Osteoporos Int 16:713-716
Chapuy MC, Preziosi P, Maamer M, Arnaud S, Galan P, Hercberg S, Meunier PJ (1997) Prevalence of vitamin D insufficiency in an adult normal population. Osteoporos Int 7:439-443
Bischoff-Ferrari HA, Giovannucci E, Willett WC, Dietrich T, Dawson-Hughes B (2006) Estimation of optimal serum concentrations of 25-hydroxyvitamin D for multiple health outcomes. Am J Clin Nutr 84:18-28
Lappe JM, Travers-Gustafson D, Davies KM, Recker RR, Heaney RP (2007) Vitamin D and calcium supplementation reduces cancer risk: results of a randomized trial. Am J Clin Nutr 85:1586-1591
Lips P (2001) Vitamin D deficiency and secondary hyperparathyroidism in the elderly: consequences for bone loss and fractures and therapeutic implications. Endocr Rev 22:477-501
International Organization for Standardization (ISO). ISO/DTS 21748 Guide to the use of repeatability, reproducibility and trueness estimates in measurement uncertainty estimation. 2003
Feinberg M, Boulanger B, Dewe W, Hubert P (2004) New advances in method validation and measurement uncertainty aimed at improving the quality of chemical data. Anal Bioanal Chem 380:502-514
EURACHEM/CITAC Guide CG 4; Quantifying Uncertainty in Analytical Measurement, Second Edition. 2000
Binkley N, Krueger D (2008) Evaluation and correction of low vitamin D status. Curr Osteoporos Rep 6:95-99
Eastell R, Arnold A, Brandi ML, Brown EM, D'Amour P, Hanley DA, Rao DS, Rubin MR, Goltzman D, Silverberg SJ, Marx SJ, Peacock M, Mosekilde L, Bouillon R, Lewiecki EM (2009) Diagnosis of asymptomatic primary hyperparathyroidism: proceedings of the third international workshop. J Clin Endocrinol Metab 94:340-350
Binkley N, Krueger D, Cowgill CS, Plum L, Lake E, Hansen KE, Deluca HF, Drezner MK (2004) Assay variation confounds the diagnosis of hypovitaminosis D: a call for standardization. J Clin Endocrinol Metab 89:3152-3157
Glendenning P, Noble JM, Taranto M, Musk AA, McGuiness M, Goldswain PR, Fraser WD, Vasikaran SD (2003) Issues of methodology, standardization and metabolite recognition for 25-hydroxyvitamin D when comparing the DiaSorin radioimmunoassay and the Nichols Advantage automated chemiluminescence protein-binding assay in hip fracture cases. Ann Clin Biochem 40:546-551
Hollis BW (2000) Comparison of commercially available (125) Ibased RIA methods for the determination of circulating 25-hydroxyvitamin D. Clin Chem 46:1657-1661
Lips P, Chapuy MC, Dawson-Hughes B, Pols HA, Holick MF (1999) An international comparison of serum 25-hydroxyvitamin D measurements. Osteoporos Int 9:394-397
Vieth R (2000) Problems with direct 25-hydroxyvitamin D assays and the target amount of vitamin D nutrition desirable for patients with osteoporosis. Osteoporos Int 11:635-636
Souberbielle JC, Boutten A, Carlier MC, Chevenne D, Coumaros G, Lawson-Body E, Massart C, Monge M, Myara J, Parent X, Plouvier E, Houillier P (2006) Inter-method variability in PTH measurement: implication for the care of CKD patients. Kidney Int 70:345-350
Wieringa GE, Trainer PJ (2007) Commentary: Harmonizing growth hormone measurements: learning lessons for the future. J Clin Endocrinol Metab 92:2874-2875
Yates AM, Bowron A, Calton L, Heynes J, Field H, Rainbow S, Keevil B (2008) Interlaboratory variation in 25-hydroxyvitamin D2 and 25-hydroxyvitamin D3 is significantly improved if common calibration material is used. Clin Chem 54:2082-2084
Aloia JF, Patel M, Dimaano R, Li-Ng M, Talwar SA, Mikhail M, Pollack S, Yeh JK (2008) Vitamin D intake to attain a desired serum 25-hydroxyvitamin D concentration. Am J Clin Nutr 87:1952-1958
Cavalier E, Wallace AM, Knox S, Mistretta VI, Cormier C, Souberbielle JC (2008) Serum Vitamin D Measurement May Not Reflect What You Give to Your Patients. J Bone Miner Res 23:1864
