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D-dimer

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D-dimer

D-dimer

D-dimer is a protein fragment that is formed when a blood clot that occurs during blood clotting dissolves. It is a marker of thrombus formation, since in this process, along with the occurrence of thrombi, their dissolution is triggered with the formation of D-dimers.

The main diagnostic value of the D-dimer is its high (98%) negative predictive value - normal levels make it possible to exclude thrombosis. Thanks to these diagnostic capabilities of the test, it is included in the algorithms for diagnosing such a fatal condition as pulmonary embolism (PE), allowing PE to be excluded in case of negative results.

When is the study scheduled?

For symptoms of deep vein thrombosis:

severe pain in the legs (leg),

severe swelling of the legs (legs),

pallor of the skin in the area of ‚Äč‚Äčthrombosis.

If pulmonary thromboembolism is suspected:

sudden shortness of breath

difficulty breathing

cough

hemoptysis (blood in sputum),

sharp pain in the chest,

increased heart rate.

With DIC, when the following symptoms occur against the background of the underlying disease:

dyspnea,

cyanosis of the skin,

bleeding gums

nausea, vomiting,

severe pain in the muscles and abdomen,

pain in the region of the heart,

decreased urination.

When monitoring anticoagulant therapy.

For pregnant:

Week of pregnancy

Reference values

Until the 13th

0 - 0.55 μg FEU / ml

13-21st

0.2 - 1.4 μg FEU / ml

21-29th

0.3 - 1.7 μg FEU / ml

29-35th

0.3 - 3 μg FEU / ml

More than 35th

0.4 - 3.1 μg FEU / ml

What exactly is determined in the analysis process?

The amount of D-dimer in blood plasma is determined by the method of immunochemiluminescence analysis.

What do the test results mean?

A normal (within the reference values) result of the D-dimer indicates that the person who passed this test most likely does not have an acute condition associated with increased formation and disintegration of fibrin thrombi. This indicator has a negative prognostic value: with a normal D-dimer, the probability of thrombosis is low, with an increased one, additional examination of the patient is required.

An elevated D-dimer does not always indicate the presence of thrombus formation, because a number of other factors can lead to an increase in the level of D-dimer in the blood:

recent surgery (early postoperative period)

injury

liver disease

pregnancy

The D-dimer is highly sensitive but lacks specificity and should only be used to rule out thrombosis and not to confirm the diagnosis.

A moderate increase in D-dimer concentration is often observed with:

recent surgeries,

injuries (not extensive),

cardiovascular diseases,

oncological diseases,

liver diseases,

a normal pregnancy, especially in the later stages.

How to properly prepare for the study?

Eliminate fatty foods from the diet 24 hours before the study.

Eliminate physical and emotional stress 30 minutes before the study.

Do not smoke for 30 minutes prior to examination.

Important notes

The D-dimer concentration may be elevated in the elderly, as well as in patients with high rheumatoid factor levels in rheumatoid arthritis.

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