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The commitment of Vall d'Hebron University Hospital to innovation allows us to be at the forefront of medicine, providing first class care adapted to the changing needs of each patient.
Blood tests are one of the most frequent medical tests. They involve taking a blood sample from the patient that is then analysed in a laboratory.
Information about the composition of the patient’s blood can be used for many different purposes. For this reason, not all the components of the sample are ever analysed, but rather those components that the doctor decides are useful, depending on the signs and symptoms the patient presents or what they need to know about the patient’s state of health. Blood tests can be requested to:
The most commonly used parameters in blood tests offer an overall view of the patient’s health status using different indicators:
There are specific studies that should be carried out depending on each specific case, for example immunological studies, genetic analysis, etc.
Taking the blood sample is simple, the healthcare professional just needs to puncture a patient’s vein with the right type of calibre needle, depending on the patient, and fill the prepared tubes, depending on what needs to be analysed.
The puncture is usually done on the inside of the elbow, and, before doing so, the nurse places a compressor on the arm, normally a rubber band, so that the blood vessels fill up and the blood can be taken more easily. Sometimes it is difficult to puncture this area and alternative locations are used, such as the back of the hand and, especially in children, feet and neck and groin veins.
Once the professional has decided where to make the puncture, it must be cleaned with antiseptic solution before the needle is inserted.
In some cases, patients need to remain still during the extraction, but this is not always necessary. It all depends on the type of analysis required.
Although complications are not usual, some may occasionally occur:
There are no alternatives for taking blood samples.
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