ABSTRACT
Calcium has different functions in metabolic processes and increase or decrease of calcium level in blood may lead to different disorders. Therefore, measurement of calcium level in blood is an important clinical issue. It is not possible to measure calcium in plasma samples which contain calcium chelators and we need serum samples to do so. This research aims to investigate the simple and direct colorimetric method for calcium measuring in EDTA treated plasma. In this experimental study, through adding a patented solution to EDTA treated plasma, calcium ions are released from calcium chelators and then reacted with Ortho Cresolphthalein Complexone [o-CPC] as a coloring reagent and finally product of calcium reaction is measured using microplate reading format. The details of methodology are patented on 29.04.2012 in State Organization for Registration of Deeds and Properties with registration number of 74804, and are the exclusive property for the owners. Sensitivity, precision, accuracy, and the correlation of plasma calcium with serum calcium level were investigated. Sensitivity of this method was 0.4 mg/dL. Coefficient of variation for intra assays and inter assay were less than 5% and 6% respectively. According to recovery and parallelism tests, ratio and recovery percent ranged from 90 to 110% and correlation coefficient in compare with determination of calcium in serum by the same reagent was 0.92. This method is capable of measuring calcium in EDTA treated plasma and in addition, it has the required sensitivity, precision and accuracy for common clinical tests
ABSTRACT
Resistin hormone is a polypeptide hormone belonging to the family of hormone-like resistin molecules. Controversial results have been reported between serum level of resistin and thyroid abnormalities, including hypothyroidism and hyperthyroidism. The purpose of this study was to evaluate the serum level of resistin hormone in patients with hypothyroidism and hyperthyroidism and its association with weight and body mass index. In this case-control cross sectional study 48 patients with hypothyroidism, 34 patients with hyperthyroidism, and 82 individuals as control group were considered. BMI, fasting resistin, TSH, and T4 serum levels were measured by enzyme immunoassay methods. Data were compared using t-test, Pearson correlation coefficient, and ANOVA to evaluate correlation between variables. p< 0.05 was considered statistically significant. Resistin serum levels in hypothyroidism and hyperthyroidism patients was significantly higher than the control group. There was not any significant correlation between resistin serum levels, BMI, age, and thyroid hormones level. Also in hypothyroidism patients a positive correlation was observed between BMI and TSH level, and a negative correlation between BMI and T4 level. The result of this study showed the increase in serum level of resistin in patients with thyroid dysfunction. This correlation was independent of BMI changes in patient. The findings suggest that changing in serum level of resistin may be considered as a criterion for diagnosis of thyroid dysfunction. Although, this hypothesis needs to be more study