H Khalili, M Rad ,
Volume 3, Issue 1 (6-2011)
Abstract
Abstract Background and Objective: Sphygmomanometers are instruments nessesery for the basis of blood pressure measurement, it is well established that this device especially when is used in general practice may often be inaccurate and may cause errors in the measurement of accurate blood pressure. In this study we carried out an analysis of all aneroid and mercury sphygmomanometers currently in use in Sabzevar hospitals for their accuracy and physical condition. Materials and Methods: In this descriptive cross sectional study, all sphygmomanometers currently in use in Sabzevar hospitals were tested. A total 63 sphygmomanometers were compared with a standard mercury sphygmomanometer. Deviation of the hand of the aneroid sphygmomanometers and the mercury level of the mercury sphygmomanometers at rest were studied. The drop in pressure from 300mmHg was studied after one minute. SPSS 11.5 software and descriptive statistics were used to describe the data. Results: 50 (79.4%) out of 63 sphygmomanometers were not level of reference zero at rest. 88.9% of the sphygmomanometers had a pressure loss of more than 15 mmHg in one minute, when the cuff was inflated to 300mmHg around a can – with a circumference of about 32 cm. the mean of difference between the sphygmomanometers and the standard sphygmomanometer in the 100 mm level was 6.67 mmHg. 54% of the sphygmomanometers showed a difference of more than 4 mmHg with the standard sphygmomanometer. Conclusion: Most in use sphygmomanometers were not accurate and must either be calibrated or must be out of use. We recommend that all hospitals need to have procedures in place for the regular calibration of their sphygmomanometers.
Shadi Sharifi, Mohammad Javadzadeh, Ali Sherafatnia, Ghorbani, Elham Sharifian, Amirhosein Khoshi,
Volume 9, Issue 4 (3-2018)
Abstract
Introduction: Total iron binding capacity (TIBC) assay is important investigation of body iron state. The most common method is chemical-precipitation reference method with pre-analysis step. New diagnostic approaches for direct measurement of TIBC have been proposed to streamline and reducing the time of analysis. The aim of study was to compare of accuracy and precision of TIBC direct assay with precipitation method.
Methods: Under standard laboratory condition, twenty-five individuals' serum samples for each of the low, normal and high TIBC levels were analyzed by both precipitation and direct methods. To investigate of analytical accuracy and precision, the assayedcommercial serum-control was used.
Results: There were not significant difference between different serum-TIBC levels which analyzed by precipitation and direct methods (P=0.25, P=0.17 and P=0.34 for low, normal and high levels, respectively); however, there were more differences between serum-TIBC that analyzed by precipitation method. To investigate of within-run -run9%) for precipitation and direct methods, respectively. However, there were not significant differences in accuracy and precision between two methods (P=0.53).
Conclusions: The results showed that despite of allowable accuracy and no significant differences between precipitation and direct methods of TIBC measurement, because of lower standard deviation and CV%, and also simplicity of direct assay, it is suggested that the direct assay can be replace instead of precipitation method.
