For all laboratories, on the fifth date, five serum and five urine specimens were sent to each laboratory in order to assess within-run variability of the marker measurements. Each of the six laboratories used one of two assays for urine NTX measurements and one of two assays for serum BAP measurements. For urine NTX, two laboratories (LabCorp and Specialty) used the Osteomark assay (Inverness Medical Innovations, Waltham,

MA, USA), an ELISA using a monoclonal antibody directed against a urinary pool of collagen cross-links originally derived from a patient with Paget’s disease. Four laboratories (ARUP, Esoterix, Mayo, and find more Quest) used the Vitros enhanced chemiluminescence (ECi) assay (Ortho-Clinical Diagnostics, Rochester, NY, USA), a fully automated platform using the same antigen. For serum BAP, one laboratory (Specialty) used the Metra BAP enzyme immunoassay (Quidel, San Diego, CA, USA), while five laboratories (ARUP, Quest, Esoterix, Mayo, and LabCorp) used Access Ostase (Beckman Coulter, Fullerton, CA, USA), another enzyme immunoassay. Of note,

Metra BAP was formerly called Alkphase-B. Access Ostase was formerly Hybritech Tandem-MP Ostase, which itself was developed from the monoclonal antibody used for the Hybritech Tandem-R Ostase immunoradiometric assay. The laboratories communicated the results Bacterial neuraminidase by fax to the authors’ institutional 5-Fluoracil clinical laboratory, as is done for routine clinical specimens. Urine NTX values were {Selleck Anti-diabetic Compound Library|Selleck Antidiabetic Compound Library|Selleck Anti-diabetic Compound Library|Selleck Antidiabetic Compound Library|Selleckchem Anti-diabetic Compound Library|Selleckchem Antidiabetic Compound Library|Selleckchem Anti-diabetic Compound Library|Selleckchem Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|Anti-diabetic Compound Library|Antidiabetic Compound Library|buy Anti-diabetic Compound Library|Anti-diabetic Compound Library ic50|Anti-diabetic Compound Library price|Anti-diabetic Compound Library cost|Anti-diabetic Compound Library solubility dmso|Anti-diabetic Compound Library purchase|Anti-diabetic Compound Library manufacturer|Anti-diabetic Compound Library research buy|Anti-diabetic Compound Library order|Anti-diabetic Compound Library mouse|Anti-diabetic Compound Library chemical structure|Anti-diabetic Compound Library mw|Anti-diabetic Compound Library molecular weight|Anti-diabetic Compound Library datasheet|Anti-diabetic Compound Library supplier|Anti-diabetic Compound Library in vitro|Anti-diabetic Compound Library cell line|Anti-diabetic Compound Library concentration|Anti-diabetic Compound Library nmr|Anti-diabetic Compound Library in vivo|Anti-diabetic Compound Library clinical trial|Anti-diabetic Compound Library cell assay|Anti-diabetic Compound Library screening|Anti-diabetic Compound Library high throughput|buy Antidiabetic Compound Library|Antidiabetic Compound Library ic50|Antidiabetic Compound Library price|Antidiabetic Compound Library cost|Antidiabetic Compound Library solubility dmso|Antidiabetic Compound Library purchase|Antidiabetic Compound Library manufacturer|Antidiabetic Compound Library research buy|Antidiabetic Compound Library order|Antidiabetic Compound Library chemical structure|Antidiabetic Compound Library datasheet|Antidiabetic Compound Library supplier|Antidiabetic Compound Library in vitro|Antidiabetic Compound Library cell line|Antidiabetic Compound Library concentration|Antidiabetic Compound Library clinical trial|Antidiabetic Compound Library cell assay|Antidiabetic Compound Library screening|Antidiabetic Compound Library high throughput|Anti-diabetic Compound high throughput screening| reported by all labs in whole numbers; BAP values were reported by four of the labs to one tenth of a microgram per liter or unit per liter but by Esoterix and Mayo as whole numbers. Following standard practice, labs corrected urine NTX values for dilution by urinary creatinine analysis and reported results as NTX/creatinine ratios (to be referred to simply as NTX in this paper). Means,

SDs, and coefficients of variation (CVs, defined as mean/SD) with 95% confidence intervals (CIs) were calculated [8]. A CV for within-run reproducibility for BAP could not be computed for Esoterix because the reported values were rounded to the nearest microgram per liter and did not vary. Two sensitivity analyses were performed: first, a uniform random variate on the interval [−0.5, 0.5] was added to the BAP values reported by that lab and by Mayo, which also rounded to the nearest microgram per liter. Then, the perturbed results were rounded to the nearest 0.1 μg/L, as reported by the other labs. Second, CVs were computed after rounding reported values from all six labs to the nearest microgram per liter (or, for Metra, the nearest U/L).