血常規(guī)-英文(編輯修改稿)
2025-08-22 04:46 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 se aids.)To identify the numbers of different white cells, ablood filmis made, and a large number of white blood cells (at least 100) are counted. This gives the percentage of cells that are of each type. By multiplying the percentage with the total number ofwhite blood cells, the absolute number of each type of white cell can be obtained.Manual counting is useful in cases where automated analyzers cannot reliably count abnormal cells, such as those cells that are not present in normal patients and are only seen in peripheral blood with certain haematological conditions. Manual counting is subject to sampling error because so few cells are counted pared with automated analysis. A manual count will also give information about other cells that are not normally present in peripheral blood, but may be released in certain disease processes.Medical technologists examine blood film via a microscope for some CBCs, not only to find abnormal white cells, but also because variation in the shape of red cells is an important diagnostic tool. Although automated analysers give fast, reliable results regarding the number, average size, and variation in size of red blood cells, they do not detect cells39。 shapes. Also, some normal patients39。 platelets will clump in EDTA anticoagulated blood, which causes automatic analyses to give a falsely low platelet count. The person viewing the slide in these cases will see clumps of platelets and can estimate if there are low, normal, or high numbers of platelets.Manual blood counts use alight microscope, usually with a specializedmicroscope slide, which is called ahemocytometer.This shows the view through the microscope of the specialized hemocytometer slide. The builtin grid simplifies counting cells by helping the technician keep track of which cells have already been counted.A scanning electron microscope (SEM) image of normal circulating human blood. One can see red blood cells, several knobby white blood cells including lymphocytes, a monocyte, a neutrophil, and many small discshaped platelets.Included tests[edit]A plete blood count will normally include:White cells[edit]Totalwhite blood cellsare reported, and a differential reports all the white cell types as a percentage and as an absolute number per litre.[5]A high WBC may indicate an infection.Neutrophils: May indicatebacterialinfection. May also be raised in acute viral infections. Because of the segmented appearance of the nucleus, neutrophils are sometimes referred to as segs. The nucleus of less mature neutrophils is not segmented, but has a band or rodlike shape. Less mature neutrophils—those that have recently been released from the bone marrow into the bloodstream—are known as bands or stabs. Stab is a German term for rod.[6]Lymphocytes: Higher with someviralinfections such as
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