![]() How is the sample collected for testing?Ī blood sample is obtained by inserting a needle into a vein in the arm or by pricking a finger, ear or, in the case of an infant, a heel. During this examination, the size, shape and colour (indicators of haemoglobin content) of the RBCs can be measured and the number of platelets estimated. It is possible to distinguish between the five different types of WBCs and to find their relative percentages by counting 100 consecutive cells. In addition, the size, shape and general appearance of the cells can be compared to that of “normal” cells. Under the microscope, the stained WBCs can be easily seen and counted to estimate the number of each type of cell present. The drop of blood on the slide contains millions of RBCs, thousands of WBCs, and hundreds of thousands of platelets. Once the stain has dried the slide is looked at under a microscope by a healthcare scientist or haematologist. To produce a blood film, a single drop of blood is spread in a thin layer across a glass slide, dried, and then stained with a special dye. Values can change at times of illness or stress intense exercise or smoking can also affect cell counts.Ī blood film is a snapshot of the cells that are present in the blood at the time that the sample is obtained. The number and type of each cell present in the blood changes but is normally maintained by the body within specific ranges. Platelets appear as small cell fragments and, when activated, stick together to form a plug as one of the first steps to stop bleeding. WBCs’ main function is to fight infection, while RBCs carry oxygen to the whole of the body. These cell are produced and mature in the bone marrow and are released into the bloodstream when needed. We are not a laboratory and are unable to comment on an individual's health and treatment.Ī blood film allows the evaluation of white blood cells (WBCs, leucocytes), red blood cells (RBCs, erythrocytes), and platelets (thrombocytes). Lab Tests Online-UK is an educational website designed to provide patients and carers with information on laboratory tests used in medical care. If you are concerned about your test results, you will need to arrange an appointment with your doctor so that all relevant information including age, ethnicity, health history, signs and symptoms, laboratory and other procedures (radiology, endoscopy, etc.), can be considered. ![]() If the doctor wants to see you about the result(s), you will be offered an appointment. Your GP practice will be able to provide specific details. If you are registered to use the online services of your local practice, you may be able to access your results online. The X-ray & scan results may take longer. Some specialist test results may take longer, if samples have to be sent to a reference (specialist) laboratory. On average it takes 7 working days for the blood test results to come back from the hospital, depending on the exact tests requested.
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