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Regarding the association of HbA2 and gender, an association of lower HbA2 levels in females was apparent using the student's t-test. This association was not apparent on multivariate analysis, suggesting that the association between gender and HbA2 in our study population was better explained by other factors (e.g., ��-thalassemia mutation type and/or serum ferritin). Reports of studies on the relationship between iron deficiency and HbA2 levels in BTT are conflicting (Supporting Information Table 2). This is likely a result of patient heterogeneity, study design, definition of iron deficiency, HbA2 level, and BTT. Criteria for diagnosis of ��-thalassemia trait: Almost all previous studies http://www.selleck.cn/products/Staurosporine.html used surrogate markers to identify BTT, such as red blood cell indices or HbA2 level, which could potentially have mis-identified individuals as having BTT and/or confounded interpretation of their results. Methods used to determine HbA2 and iron deficiency: Some methods of HbA2 measurement are unreliable. There is also variability between laboratories. Similarly, there are many methods used for determining iron store status. Bone-marrow hemosiderin staining is considered the gold standard, but requires bone marrow examination which is an invasive procedure. Serum ferritin is a simple and reliable method of evaluating iron stores. Only the two most recent studies used low serum ferritin as a marker of http://www.selleckchem.com/products/epz-5676.html iron deficiency [ 9, 10]. No studies assessed bone-marrow hemosiderin. It has been shown that serum ferritin level shows a better association with bone-marrow hemosiderin level than serum iron, with or without transferrin saturation [15, 16]. Variation in ��-thalassemia mutation: http://www.selleckchem.com/products/ly2109761.html ��-thalassemia mutations differ among racial and ethnic groups. If mutation genotype was not determined and taken into consideration in the analysis of HbA2 levels, associations could have potentially been erroneously attributed to iron deficiency. HbA2 levels can be low or normal in �Ħ�-thalassemia trait, or when BTT is coinherited with a ��-globin gene mutation. If testing is not done for ��-globin abnormalities in BTT individuals with low HbA2 and iron deficiency, lower HbA2 might be erroneously attributed to iron deficiency. To the best of our knowledge, this is the first study of HbA2 and iron deficiency in individuals with BTT of Chinese ancestry. Each of the prior studies addressing this question evaluated different ethnic groups. Unknown genetic factors related to ethnicity may play a role. Previous studies of BTT and iron deficiency have noted that reduction in the HbA2 level is most pronounced in patients with profound iron deficiency. It has been postulated that synthesis of ��-globin chains is inhibited, resulting in a relative deficiency of ��-chains with which ��-chains can form HbA2 tetramer [ 1].