Vitamin D and vitamin D binding protein levels in COVID-19 intensive care unit patients: A prospective multicenter study.

Background: Vitamin D binding protein plays a crucial role in regulating vitamin D levels by carrying vitamin D and its metabolites and immunological response by binding to endotoxins and fatty acids. We aimed to compare vitamin D, DBP, and specific inflammatory markers among intensive care unit (ICU) patients with and without the COVID19 virus.

Methods: This multicenter study in two training and research hospitals included 37 (13 female) COVID-19positive and 51 (34 female) COVID-19-negative ICU patients.

Utilization of biological variation data in the interpretation of laboratory test results - survey about clinicians' opinion and knowledge.

Introduction: To interpret test results correctly, understanding of the variations that affect test results is essential. The aim of this study is: 1) to evaluate the clinicians' knowledge and opinion concerning biological variation (BV), and 2) to investigate if clinicians use BV in the interpretation of test results.

Materials And Methods: This study uses a questionnaire comprising open-ended and close-ended questions.

The use of preanalytical quality indicators: a Turkish preliminary survey study.

Objectives: The utilization of reliable quality indicators (QIs) proven to be suitable for monitoring and improvement tools is one of the best choices to minimize of the risk of errors in all laboratory processes called as total testing process (TTP). In 2008, a Working Group "Laboratory Errors and Patient Safety" (WG-LEPS) established by International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) developed the Model of Quality Indicators (MQI) complying with requirements of the ISO 15189:2012 standard for laboratory accreditation. They have also been dealing with harmonizing the QIs in most laboratories worldwide since then.

Analysis of Prescribed Critical Values in Istanbul Training and Research Hospital Biochemistry Laboratory: Should Critical Values Be Repeated?

Background: Clinically important critical values must be readily available to the clinician. Repeating critical values may cause a delay. In this study, we evaluated the requirement of repeating critical values.

Dynamic thiol-disulphide homeostasis in low-grade gliomas: Preliminary results in serum.

Objective: Maintaining of precise balance between oxidation and anti-oxidation is important in both physiological and pathological states. Knowledge about this balance may give an idea about the process of the disease. The aim of this study was to investigate dynamic thiol-disulfide homeostasis in patients with low-grade gliomas.