Blood and its constituent components are the most accurate indicators of human health. The study of the collected material makes it possible to observe negative changes at the cellular level and to diagnose various diseases in a timely manner.
Complete blood count from a vein or from a finger is prescribed without fail when the patient goes to the doctor with any complaints. This makes it possible to block the inflammatory process, prescribe a suitable drug for the treatment course in the required dosage, follow its effect on the patient’s body during the treatment process.
What does a clinical study show?
A general or clinical analysis is appointed by all physicians without exception when a person applies with complaints of changes in well-being and is considered a basic research. It allows the doctor to make a preliminary conclusion about the patient’s state of health during the history taking, and decide which examinations he should undergo.
Biochemical analysis is an in-depth research method that allows you to get information about the work of internal organs, metabolism and is assigned to clarify the diagnosis.
The blood composition of a healthy person is stable and undergoes changes only if there is an infection, an inflammation center, bleeding, sugar is elevated. A complete blood count, taken from a vein or from a finger, allows you to find the origins of the disease before the manifestation of its characteristic symptoms.
General analysis allows you to expand the clinical picture and to characterize:
- color index;
- erythrocyte sedimentation rate;
- hemoglobin level;
- the quantity and quality of granulocytes and agranulocytes;
- the quantity and quality of red blood cells, platelets;
- hematocrit volume;
- the ratio of different groups of leukocytes is leukoformula.
It is recommended to take a general analysis from a vein or from a finger on an empty stomach, but this requirement is not mandatory. The main condition – the exclusion from the diet of fatty foods and alcohol for 12 hours before the test. You can not pass the study after physiotherapy, sunbathing and X-ray examination.
Difference between venous blood and capillary
A finger or vein blood test can help identify diseases directly related to the circulatory system and hidden inflammatory processes. This is facilitated by the technological development of equipment and automation of all processes in laboratories.
To build a complete picture of the development and course of the disease may require frequent delivery of material for research. Blood tests are taken from a finger or from a vein, the number of fences per year is limited.
Capturing material takes a short time. The result becomes known in a few hours. In the case of the patient taking medications you need to inform the doctor, as this may cause distortion of the final picture.
The research indicators are decoded only by employees of medical institutions with special training. An analysis taken from a finger or from a vein may have differences in performance in patients of different ages and genders. Values in women during pregnancy and the menstrual cycle usually deviate from the norm.
Complete blood count taken from a vein or from a finger is not much different. However, there are two points:
- capillaries contain less platelet count and basophils;
- the content in the venous blood of leukocytes, neutrophils and lymphocytes is higher than in the material taken from the finger, which causes a decrease in the relative number of monocytes.
Complete blood count from a finger or from a vein is decoded according to accepted standards. A small deviation from the norm before making a diagnosis requires additional research.
Conducting research on blood group and Rh factor
Often during treatment it is necessary to determine the patient’s belonging to a certain group of people, to identify the immunogenetic characteristics of his blood. It is possible to learn the Rh factor by taking blood from a finger and from a vein, while there is a difference in the final result.
In adults, it is preferable to pierce a vein, while the child can give a finger. To find out your blood type, it is enough to analyze from a finger, for accurate determination of the Rh factor, it is better to donate blood from a vein.
The procedure takes little time. It requires a small amount of material:
- To determine which group a person has, 4 drops of blood from a finger or from a vein are applied separately on a glass slide;
- the prepared material is mixed with special reagents;
- the presence or absence of agglutination indicates membership in a group.
Special training before the fence is not required. When taking material for analysis, doctors advise blood donation from a vein, as this allows for the most accurate conclusion. When a material is taken from a vein, the red blood cells are not destroyed in test tubes, they do not form microbunches, as in the case of a capillary fence, which helps to obtain reliable health information in full.
More information about the indicators that determine the analysis of venous or capillary blood can be found in the video: