Blood test

In the blood test, ingredients and solid components of the blood are accurately analyzed. Read more about the blood test!

Blood test

The blood test is one of the most helpful diagnostic methods in medicine. It compares ingredients as well as the number and nature of the individual solid constituents of the blood with reference values ​​and normal ranges. Read all about the different types of blood tests, how they are done and when they are needed.

Product Overview

blood test

  • What is a blood test?

  • When do you do a blood test?

  • What do you do with a blood test?

  • What are the risks of having a blood test?

  • What should I consider after a blood test?

What is a blood test?

In a blood test, a blood sample is broken down into its components in the laboratory and examined by various tests. This often includes a small blood count (counting of the main cell types such as erythrocytes, leukocytes, platelets and determination of Hb value and hematocrit) and a differential blood picture (more accurate differentiation of the different leukocyte types.

In addition, many molecules, substances and compounds that float in the blood or can be determined, such as salts, trace elements, fats or metabolites, enzymes and hormones.

When do you do a blood test?

On the one hand, a blood test can be routinely done to control the course and possible effects of a disease. A classic example of this is the blood sugar control in diabetes mellitus.

On the other hand, a blood test helps in the diagnosis of many diseases, as conclusions about the function of the organs can be drawn on the basis of different blood values. For example, a rapid test for the enzyme troponin helps to rule out a heart attack, as its concentration in the blood is increased when the heart muscles are damaged. In addition, in an infection usually pathogens in the blood or specific antibodies against a pathogen can be detected.

For these diseases, the examination is important

  • Morbus Meulengracht
  • Addison's disease
  • osteoporosis
  • leukemia
  • EHEC
  • Cushing's disease
  • Polycystic ovary syndrome
  • porphyria
  • Conn's syndrome
  • AIDS

What do you do with a blood test?

For a blood test usually venous blood is taken, generally from a vein in the crook of the arm. Sometimes even a few drops of blood from the fingertip or the earlobe are sufficient, for example for the determination of blood sugar in diabetics.

This thoroughbred contains all ingredients. Depending on the question, it is subjected to a wide variety of tests. By centrifuging, the solid components in the blood can be separated from the liquid in which they are floating (plasma). For this, the blood must first be mixed with an anticoagulant substance (such as citrate, EDTA). This is usually already contained in the tubes that are used for blood collection. From EDTA blood, for example, a blood count is made or the blood type is determined. Citrated blood, for example, is used to measure the blood cell lowering rate.

Blood serum is needed to measure many parameters. It corresponds to the blood plasma minus the coagulation factors. To obtain the serum, whole blood is allowed to coagulate (coagulate) and then separated by centrifugation, the liquid phase (= serum) from. For example, blood serum can be tested for blood sugar, blood lipids, hormones, enzymes, iron and other minerals, and antibodies.

Blood cell determination

While blood counts used to be evaluated microscopically, nowadays automatic hematology equipment counts the number of erythrocytes, leukocytes, and platelets. The breakdown into the individual subgroups of leukocytes is also carried out by machine. Only in rare cases a doctor counts the blood cells under the microscope today.

More about the symptoms

  • palpitations
  • edema
  • nocturia
  • loss of libido
  • Inner unrest
  • polydipsia
  • anemia
  • Irregular cycle
  • dry mouth
  • Dry skin

What are the risks of having a blood test?

The blood test as such carries no risks. In rare cases, an infection of the puncture site may occur during blood sampling. Bruising (hematoma) develops especially if the wound has not been compressed long enough. Wrong measurements are rare, but still possible. For example, too long blood stasis leads to falsely high potassium levels.

What should I watch out for in a blood test?

For some blood tests, you need to be sober. This means that you should not eat anything eight to twelve hours before. You can eat water and tea without sugar. Once the lab the blood test your doctor discusses the results with you.


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