ABSTRACT
Introduction: Vitamin D is one of fat-soluble vitamin that plays an important role in the absorption of calcium and phosphate. Deficiency of Vitamin D is unrecognized in many parts of the world. Leptin is a hormone which is derived from adipose tissue. Studies have shown that vitamin D has a negative and powerful control on leptin secretion by vitamin D by acting on the adipose tissue. Aim and Objectives: The study was done to study the relationship between Vitamin D and Leptin based on Body mass index among the medical students. Materials and methods: Vitamin D Leptin and Body mass index were the parameters measured in the study group. Individuals with an age group of 19-23 years of both sexes were included in the study. Individuals above the age of 23 years, those with renal and liver disorders, individuals with hormonal disorders, individuals on vitamin D supplementation were excluded in the study. Vitamin D was measured by Enzyme-Linked Immunosorbent Assay (ELISA) method. Leptin was measured by Enzyme-Linked Immunosorbent Assay (ELISA) method. BMI is calculated by the formula weight in kilograms divided by height in metre square. Results: The results have shown that there is a decrease in vitamin D levels with increasing BMI. (pvalue≤0.001). furthermore, there is an increase in leptin levels with an increase in BMI. (pvalue≤0.001). Conclusion: The study has put forth a suggestion that leptin and vitamin D has a causal relationship between them based on Body Mass index. Adequate vitamin D levels will maximize the effect of maintaining normal leptin levels as high levels of leptin could contribute to obesity-related disorders.
ABSTRACT
Background. Laboratory measurements are an integral part of epidemiological studies in cardiovascular disease. Standardization and quality assurance is of utmost importance in the context of multicentre studies. Methods. We evaluated a simple and cost-effective method of quality assurance for measurement of total cholesterol, high density lipoprotein (HDL) cholesterol and triglycerides in a study involving 10 centres. Three methods for quality assessment were used for the study that involved measurement of cholesterol, triglycerides and HDL cholesterol and included internal quality control, external quality control and 10% repeat analysis in addition to a uniform standardized protocol developed for the 10 centres. External quality control material was prepared and circulated by the coordinating laboratory. Results. External quality control material was distributed 20 times during the study. The mean variance index suggested a substantial improvement in the performance of participating laboratories over a period of time for cholesterol and triglycerides. This was also evident in the improvement in per cent technical error as a measure of bias and a higher correlation between replicates of samples analysed in the coordinating laboratory and the participating centres for cholesterol, triglycerides and HDL cholesterol. Conclusion. A cost-effective quality assurance model for laboratory measurement using local capacities was developed and implemented in a multicentre epidemiology study. Such a programme would be useful for developing countries where cost-cutting is important.