Information on the ascertainment of heart failure are given in the techniques section in the Supplementary Appendix, available with the full text of this article at NEJM.org. Cardiac troponin T focus was measured by using high-sensitivity electrochemiluminescence assays. According to the producer, the limit of recognition of the troponin T assay is certainly 3 ng per liter, and the 99th %ile in a healthy people of volunteers is 14 ng per liter. The 10 percent coefficient of variation is reported to be less than this value. We compared the baseline characteristics of the group with normal troponin T concentrations with those of the group with unusual troponin T concentrations using the Wilcoxon rank-sum test for constant variables and the chi-square test for categorical variables.Tests such as a complete bloodstream count, liver and kidney function panels, and bloodstream chemistries can give important information about the amount of normal blood cells in the body and how well the organs will work. The blood cells will also be examined under a microscope to check for abnormal styles or sizes, and determine which subtype of AML a kid has. Bone marrow biopsy and aspiration. In this process, the doctor inserts a needle into a large bone, the hip usually, and removes a small amount of bone marrow to examine it for irregular cells. Imaging studies. These may include an X-ray, CT scan, MRI, or ultrasound to check for an enlarged liver or spleen, and also to rule out any other possible causes of a child’s symptoms.