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Blood Serum – Definition, Composition and Function

Blood serum is the clear, liquid portion of blood that remains after clotting has occurred. It contains proteins, electrolytes, and hormones, and is widely used in medical laboratory testing.

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Things worth knowing about "Blood Serum"

Blood serum is the clear, liquid portion of blood that remains after clotting has occurred. It contains proteins, electrolytes, and hormones, and is widely used in medical laboratory testing.

What Is Blood Serum?

Blood serum is the clear, pale yellow fluid that remains after blood has clotted and the solid components – including blood cells and clotting factors – have been removed. Unlike blood plasma, which is obtained by centrifuging unclotted blood and still contains clotting factors such as fibrinogen, serum does not contain any coagulation proteins. It is composed primarily of water, proteins, hormones, electrolytes, antibodies, and metabolic byproducts.

Composition of Blood Serum

Blood serum contains a wide range of important components:

Proteins: including albumin, globulins, and antibodies (immunoglobulins)
Electrolytes: sodium, potassium, calcium, magnesium, and chloride
Hormones: such as thyroid hormones, insulin, and cortisol
Enzymes: such as ALT, AST (liver enzymes), and CK (muscle enzyme)
Metabolic products: glucose, urea, creatinine, and uric acid
Lipids: cholesterol, triglycerides, and lipoproteins
Trace elements and vitamins

How Is Blood Serum Obtained?

To obtain blood serum, a blood sample is collected from the patient in a special tube that contains no anticoagulants. The blood is allowed to clot over approximately 30 to 60 minutes. The sample is then placed in a centrifuge, which separates the liquid serum from the solid clotted components. The resulting serum is then ready for laboratory analysis.

Medical Importance and Applications

Blood serum is one of the most commonly used biological samples in clinical diagnostics. It allows for the measurement of numerous laboratory values that provide insight into a person's health status:

Organ function: Liver, kidney, and thyroid values are routinely measured in serum.
Metabolic disorders: Conditions such as diabetes mellitus or hypercholesterolemia can be diagnosed using serum values for blood glucose and lipids.
Inflammatory markers: CRP (C-reactive protein) and other inflammatory markers indicate the presence of infections or chronic diseases.
Immunology: Serum is used to detect antibodies against pathogens or the body's own structures, which is essential for diagnosing autoimmune diseases and infectious conditions.
Tumor markers: Certain proteins found in serum may indicate the presence of specific cancers.

Blood Serum vs. Blood Plasma

Although blood serum and blood plasma are often confused, there are important differences between them:

Blood plasma is obtained from unclotted blood by centrifugation and still contains all clotting factors, including fibrinogen.
Blood serum is derived after clotting has taken place and therefore contains no clotting factors.
For many routine laboratory tests, serum is preferred because certain coagulation proteins can interfere with measurement results.

Reference Ranges and Clinical Relevance

Values measured in blood serum are compared against established reference ranges, which may vary depending on the laboratory, the age of the patient, and sex. Deviations from these normal values may indicate underlying medical conditions and typically warrant further evaluation by a qualified healthcare professional. Laboratory results should always be interpreted in a clinical context by a physician.

References

Löffler, G. et al.: Biochemie und Pathobiochemie. Springer Verlag, 9th edition, 2014.
World Health Organization (WHO): The use of essential medicines. WHO Technical Report Series, Geneva.
Thomas, L. (ed.): Labor und Diagnose. TH-Books Verlagsgesellschaft, 8th edition, Frankfurt am Main, 2012.

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