Diseases

Complete blood count

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A large blood count includes the determination of additional cell types in addition to the laboratory values ​​of the small blood count. These are mainly the different cell types of white blood cells called leukocytes. The large blood picture is made especially in suspected acute or chronic infectious disease. Read here, which blood values ​​a large blood picture contains, what they say and whether you have to appear sober for a large blood picture.

Article overviewGreat blood count

  • What is a big blood picture?
  • When do you make a big blood picture?
  • Large blood count: values ​​in the normal range
  • When are the values ​​in the big blood picture changed?
  • What to do if the big picture of blood changes?

What is a big blood picture?

A large blood count includes all laboratory data collected in the small blood picture, as well as a few additional parameters. The common laboratory values ​​are:

  • red blood cells (erythrocytes)
  • red blood pigment (hemoglobin, Hb value)
  • Proportion of cells in the blood (hematocrit)
  • mean cell volume of a red blood cell (mean cellular volume, MCV)
  • mean concentration of hemoglobin in a single red blood cell (mean corpuscular hemoglobin, MCH)
  • mean concentration of hemoglobin in all red blood cells (mean corpuscular hemoglobin concentration, MCHC)
  • white blood cells (leukocytes)
  • Platelets (platelets)

In addition, the different types of leukocytes are examined in more detail for a large blood count. These are:

  • rod and segmented granulocytes (neutrophilic granulocytes)
  • eosinophilic and basophilic granulocytes
  • monocytes
  • lymphocytes

They are determined quantitatively. That is, one determines their percentage in the blood. In addition, the doctor examines the nature of the cells, so their morphology. The determination of leukocyte types is also called differential blood picture. A large blood picture thus combines small blood count and differential blood picture.

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When do you make a big blood picture?

The small blood picture is carried out during many routine examinations. The values ​​contained therein may indicate anemia (anemia) or impaired blood formation. The additional determination of the various leukocytes, so that it becomes a large blood picture, takes place especially in suspected infections.

Big blood picture: sober or not?

In order to assess some blood levels, the patient must appear sober for blood sampling. This applies, for example, to parameters of the sugar and fat metabolism. Sober means that the patient is best left with no food at 8 pm the previous evening (except sugar-free drinks such as water or unsweetened tea).

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Large blood count: values ​​in the normal range

A large blood count is determined from a venous blood sample. The following table gives an overview of the normal values ​​of a healthy adult. For children, other reference values ​​are age-dependent.

measurand

Normal value (men)

Normal value (women)

leukocytes

4,000 - 10,000 / μl

erythrocytes

4.8 - 5.9 million / μl

4.3 - 5.2 million / μl

hemoglobin

14 - 18 g / dl

12-16 g / dl

hematocrit

40 - 54 %

37 - 47 %

MCV

78 - 94 fl

MCH

28 - 34 pg

MCHC

30 - 36 g / dl

platelets

150,000 - 400,000 / μl

Barren granulocytes

3 - 5 %

Segmented granulocytes

50 - 70 %

Basophilic granulocytes

0 - 1 %

Eosinophilic granulocytes

1 - 4 %

monocytes

3 - 7 %

lymphocytes

25 - 45 %

Whereas in the past the doctor had to count the individual cells under a microscope, today the quantitative determination of the laboratory values ​​is done exclusively with special counting machines.

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When are the values ​​in the big blood picture changed?

With a blood picture not only blood diseases are diagnosed themselves: Also diseases of different organs like the liver or the kidney can lead to a changed composition of the blood components. The different cell types in the differential blood picture react differently to diseases.

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