The norm of blood clotting in women25.05.2022
Deviations of blood coagulation values from the norm in a woman indicate various diseases in the body. Therefore, you need to regularly examine the blood to monitor this value. In women, the rate of blood clotting is 2-15 mm / hour. Pregnant women and older women will have a different rate.
Blood clotting is determined within the coagulogram. Usually, the procedure is prescribed if there is evidence.
A blood test for coagulation includes the determination of the following values:
- Blood clotting time. Normally it is 5-7 minutes. It is calculated from the moment of blood sampling and the beginning of the clotting process. This indicator reflects the activity of platelets.
- APTT. Normally, it is 24-35 seconds, and its values do not depend on the number of platelets.
- fibrinogen. This is a protein that is responsible for the speed of clotting. Normally, it is 2-4 g / l.
- prothrombin time (PTT). Shows the rate of plasma clotting and the concentration of thrombin and prothrombin – proteins responsible for clotting. Normal prothrombin time in women is 11-18 seconds.
Only a doctor should interpret the results. If deviations are found, additional diagnostic studies are carried out to make a diagnosis.
At home, clotting can be judged by the duration of bleeding. It is necessary to detect the time from damage to the skin and until the bleeding stops. Normally, blood should be released no longer than 5 minutes.
When the definition of clotting is indicated
A coagulogram is prescribed in the presence of the following indications:
- preoperative period;
- liver disease;
- autoimmune diseases.
Low and high values are equally dangerous for a woman. If there is poor clotting, it is prone to bleeding. If the values are elevated, blood clots may form.
Coagulation rate in women by age
The study of coagulability by age is performed using the Quick test. Using this procedure, you can judge the level of prothrombin in the liver. The blood diluted with saline is examined. Chlorenanthic acid is added to it. The normal values of prothrombin detected in this way differ depending on the age group:
- in children under 6 years old – 80-100%;
- 6-12 years old – 79-102%;
- 12-18 years old – 78-110%;
- 18-25 years old – 82-115%;
- 25-45 years old – 78-135%;
- 45-65 years old – 78-142%.
Prothrombin is indicated as a percentage, since it shows the activity of the prothrombin complex of the patient’s plasma in relation to the control plasma.
Deviations of these indicators from the norm may indicate liver damage. This can be observed with hepatitis, cirrhosis and other diseases.
The norm of blood coagulation indicators, as well as the prothrombin indicator, differs in women of different ages and during pregnancy. The norm for a young non-pregnant woman is considered to be 2-15 mm / h.
Norm during pregnancy
During pregnancy, increased clotting is normal. So the body prepares for the upcoming birth. If clotting is too low, bleeding may occur during the delivery process.
But all coagulability indicators have their own norms during pregnancy:
- Fibrinogen can rise to 6 g / l, as another circle of blood circulation appears – uteroplacental. Fibrinogen increases every month and reaches its maximum values by the time of delivery. If it is higher than normal, the woman has a tendency to thrombosis. Lower values may indicate late toxicosis.
- APTT. In pregnant women, its value decreases to 17-20 seconds due to an increase in fibrinogen levels.
- prothrombin time. It may rise slightly due to the increase in fibrinogen, but remains within the normal range of 11-18 seconds.
- Prothrombin. Its norm is 78-142%. An increase in this indicator may indicate placental abruption.
During the gestation of the fetus, it is imperative to take all the tests prescribed by the doctor. This will allow you to detect any deviations in time and correct them, avoiding complications.
Coagulation rate according to Sukharev and Lee-White
This method allows you to determine the time between blood sampling and the appearance of a clot in it. The most informative methods for determining coagulation are the methods according to Sukharev and Lee-White. Both procedures have their own characteristics and clotting norms:
- In the first case, blood from a finger is used. The first drop of blood is wiped with a cotton swab, as it may contain tissue fluids. For research, only subsequent portions of physiological fluid are taken. Blood is placed in a special vessel that tilts left and right. The time it takes for a blood clot to form is measured. Normally, this process should take 3-5 minutes.
- According to Lee White, blood clotting from a vein is determined. Place two clean test tubes of the same size in a water bath. Water should be heated to 37 degrees. A vein is punctured with a wide needle, under which the first test tube is placed. As soon as the blood begins to flow into the vessel, the stopwatch starts. It is necessary to collect 1 ml of blood. A second test tube is taken, another stopwatch is set after blood enters it. Both test tubes are placed in a water bath. But the first will need to be tilted left and right every 30 seconds, and the second remains motionless. When the blood coagulates in the first test tube, they begin to tilt the second time in half a minute. After complete folding turn off the stopwatch. The normal clotting time in the first tube is 5-10 minutes, and in the second – 8-12 minutes.
Reduced clotting may indicate diseases of the liver and blood. When evaluating the results, it is necessary to take into account whether the woman is taking medications. Poor clotting can be caused by taking anticoagulants.
An increase in coagulation may indicate cirrhosis of the liver, posthemorrhagic anemia, angiohemophilia and other pathologies. It may also be associated with the use of contraceptive drugs.
The coagulogram includes the determination of several indicators of blood clotting. They must be monitored, as deviations in their values u200bu200bcan be hazardous to health. Bleeding and detachment of a blood clot can be fatal if timely assistance is not provided.
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