General (clinical) blood test is typically one of the first analyses that are assigned to standardize or Refine the diagnosis. In recent years, many laboratories take the General analysis of blood from a vein. Patients in this regard, the question often arises – why the blood is from a vein and not from a finger?
What is the analysis of blood from the vein?
Usually, the blood is for the General analysis of blood taken from a finger. But in some cases to conduct the study is assigned a blood test from the vein. It happens when the purpose of laboratory research is the identification of a large number of parameters for which the blood from the finger is not enough. Also a greater amount of blood necessary to define some types of infections.
In addition, venous blood in its composition differs from the capillary, which is taken from the finger. So, it contains more glucose, and this in many situations is important for a more accurate diagnosis.
How is the General analysis of blood from a vein?
To prepare for the study of blood from the vein enough to refrain from eating heavy fatty foods and alcohol before analysis. Analysis of blood from a vein for rent on an empty stomach, usually in the morning. Before visiting the laboratory should not eat at least two to three hours. But it deals specifically with common blood test. For some tests, stricter rules apply. For example, before biochemical analysis of blood can not eat 8 hours, and the time interval between the last meal and the time of blood sampling in the determination of blood triglycerides should be at least 12 hours. Therefore, concerning the preparation for analysis need to consult a doctor.
Blood sampling is carried out using a needle from a vein of the forearm or elbow. If these veins are not clearly visible, the blood can be taken from venous vessels popliteal depression or dorsum of the hand.
Analysis of blood from a vein – decrypt
Of course, the most detailed and accurate interpretation of blood from a vein can only be done by a doctor. However, you can independently and to compare the performance results of the analysis with the norms of analysis of blood from a vein. Below are main parameters of complete blood count, standard notation, used in many laboratories, and norms of blood from the vein, as well as some explanations on variances analysis from the norm.
1. Hemoglobin (Hb). the Norm for men 120-160 g/l for women – 120-140 g/l. Low hemoglobin can occur after bleeding, resulting in anemia and certain hereditary diseases.
2. The Hematocrit (Ht). the Norm for men and 40-45% for women 36-42%. This indicator shows the percentage of the number of blood cells (platelets, erythrocytes, leukocytes) to the volume of its liquid part – plasma. Low hematocrit happens after loss of blood, and also in case of infringement of process of formation of new blood cells, for example, in autoimmune diseases and acute infectious processes. The increase in this parameter may indicate dehydration.
3. The red blood cells. the Norm for men, and 4.3-6.2 x 1012, for women is 3.8-5.5 x 1012. Elevated levels of red blood cells indicates a risk of adhesion of red blood cells, which can lead to thrombosis (blockage of blood vessels). Low blood levels of red blood cells indicates a lack of oxygen.
4. The color indicator (CPU). the Norm of this indicator is 0,85-1,05. Denotes the ratio of the amount of hemoglobin to the level of red blood cells. Deviation color index from the norm is detected at various types of anemia.
5. Leukocytes (WBC). Norm – 4-9 x 109. This parameter blood count may be elevated in infectious processes in the body and leukemia. Reduction of leukocytes can be a sign of violation of the process of their formation in the bone marrow, which may indicate autoimmune, cancer, and acute infectious diseases.
6. Neutrophils (NEU). Norm – within 70% of the total number of leukocytes. Significant increase in the level of neutrophils usually indicate existing in the body purulent inflammatory process.
7. Eosinophils (EOS). Normal eosinophils ranges from 1-5% of the total number of leukocytes. Increased levels of eosinophils is characteristic in the presence of parasitic diseases and allergic diseases.
8. Lymphocytes (LYM). Normal level of lymphocytes in the blood – 19-30%. The increase in the number of lymphocytes occurs in infectious diseases and diseases of the blood. Low levels of lymphocytes may indicate renal failure, chronic diseases, lowered immunity, or receiving drugs that suppress the immune system.
9. Platelets (PLT). Rate – of 170-320 x 109. High platelet count can occur after surgery and in some diseases of the blood. A low platelet levels may be an indication of an acute inflammatory process or immunologic disease.
10. The erythrocyte sedimentation rate (ESR). the Norm of the parameter of blood for men is 10 mm/h for women – 15 mm/h. Increased erythrocyte sedimentation rate is usually an indirect sign of any abnormalities in the body, such as inflammation.