[Comparative study of the serum measurement of PTH on Roche Cobas e411® versus the Abbott Architect ci8200®]

Comparative Study of Cerebrospinal Fluid Evaluation in Patients With Acute Leukemia Using the Manual Method and Sysmex XN-1000

Background Many pathological settings can be provided by the cytological analysis of cerebrospinal fluid (CSF). In our work, we aimed to evaluate the concordance between the analysis using the reference manual method and the analysis using Sysmex XN-1000®. Methods In our study, we examined 121 CSF samples. To count cells in different samples, we used two methods: a manual method using Fast Read 102® counting chambers performed by at least two experienced hematologists and Sysmex XN-1000®. Evaluation of the interchangeability and concordance between the two methods was possible thanks to Passing-Bablok regression and Bland-Altman graphs. Results Our study showed no evidence of concordance between the manual method and the automated method using Sysmex XN-1000® in cell counting on CSF samples. Conclusion Every clinical laboratory aims to use automated and standardized analysis methods in counting and differentiating cells, reducing response time and interlaboratory variability. Our study shows an absence of evidence of concordance between the manual and automated methods using Sysmex XN-1000 in cell counting on CSF samples.

Vitamin D Metabolism and Guidelines for Vitamin D Supplementation

Vitamin D is essential for bone health and is known to be involved in immunomodulation and cell proliferation. Vitamin D status remains a significant health issue worldwide. However, there has been no clear consensus on vitamin D deficiency and its measurement in serum, and clinical practice of vitamin D deficiency treatment remains inconsistent. The major circulating metabolite of vitamin D, 25-hydroxyvitamin D (25(OH)D), is widely used as a biomarker of vitamin D status. Other metabolic pathways are recognised as important to vitamin D function and measurement of other metabolites may become important in the future. The utility of free 25(OH)D rather than total 25(OH)D needs further assessment. Data used to estimate the vitamin D intake required to achieve a serum 25(OH)D concentration were drawn from individual studies which reported dose-response data. The studies differ in their choice of subjects, dose of vitamin D, frequency of dosing regimen and methods used for the measurement of 25(OH)D concentration. Baseline 25(OH)D, body mass index, ethnicity, type of vitamin D (D₂ or D₃) and genetics affect the response of serum 25(OH)D to vitamin D supplementation. The diversity of opinions that exist on this topic are reflected in the guidelines. Government and scientific societies have published their recommendations for vitamin D intake which vary from 400-1000 IU/d (10-25 μg/d) for an average adult. It was not possible to establish a range of serum 25(OH)D concentrations associated with selected non-musculoskeletal health outcomes. To recommend treatment targets, future studies need to be on infants, children, pregnant and lactating women.