تويت
Reticulocyte Count
السلام عليكم ورحمة الله وبركاتة ...
اليوم نتكلم عن منشأ خلايا الدم Reticulocyte والموجوده في بعض العظام... طبعاً لاننا ندرس باللغة الانجليزيه سيكون الموضوع بالانجليزيه, وأيضاً للاستعانتي ببعض المواقع الأجنبيه , أتمنى طرح كل ما يخص الـ Reticulocyte هنا من صور مجهريه ومعلومات إضافية ..
Test Overview
اليوم نتكلم عن منشأ خلايا الدم Reticulocyte والموجوده في بعض العظام... طبعاً لاننا ندرس باللغة الانجليزيه سيكون الموضوع بالانجليزيه, وأيضاً للاستعانتي ببعض المواقع الأجنبيه , أتمنى طرح كل ما يخص الـ Reticulocyte هنا من صور مجهريه ومعلومات إضافية ..
Test Overview
A reticulocyte count is a blood test that measures how rapidly immature red blood cells called reticulocytes are made by the bone marrow and then released into the bloodstream. Reticulocytes circulate in the bloodstream for about 2 days before developing into mature red blood cells. Normally, about 1% to 2% of the red blood cells in the bloodstream are reticulocytes.
The reticulocyte count increases during rapid blood loss or in the course of certain diseases in which red blood cells are destroyed prematurely. Also, spending an extended period of time at high elevations may cause reticulocyte counts to increase to help you adapt to the lower oxygen levels found at high altitudes.
Why It Is Done
Why It Is Done
A reticulocyte count is done to:
- Determine whether anemia is being caused by decreased production of red blood cells or by increased destruction (or loss) of red blood cells. The increased destruction or loss of red blood cells causes the bone marrow to make more reticulocytes.
- Monitor treatment for anemia. For example, a higher reticulocyte count indicates that iron replacement treatment or other treatment to reverse the anemia is effective.
How To Prepare
No special preparation is required before having this test.
How It Is Done
How It Is Done
The health professional drawing blood will:
- Wrap an elastic band around your upper arm to stop the flow of blood. This makes the veins below the band larger so it is easier to put a needle into the vein.
- Clean the needle site with alcohol.
- Put the needle into the vein. More than one needle stick may be needed.
- Attach a tube to the needle to fill it with blood.
- Remove the band from your arm when enough blood is collected.
- Apply a gauze pad or cotton ball over the needle site as the needle is removed.
- Apply pressure to the site and then a bandage.
How It Feels
You may feel nothing at all from the needle puncture, or you may feel a brief sting or pinch as the needle goes through the skin. Some people feel a stinging pain while the needle is in the vein. However, many people do not feel any pain (or have only minor discomfort) once the needle is positioned in the vein. The amount of pain you feel depends on the skill of the health professional drawing the blood, the condition of your veins, and your sensitivity to pain.
Risks
Risks
Blood test
There is very little risk of complications from having blood drawn from a vein.
- You may develop a small bruise at the puncture site. You can reduce the risk of bruising by keeping pressure on the site for several minutes after the needle is withdrawn.
- Rarely, the vein may become inflamed after the blood sample is taken. This condition is called phlebitis and is usually treated with a warm compress applied several times daily.
- Continued bleeding can be a problem for people with bleeding disorders. Aspirin, warfarin (Coumadin), and other blood-thinning medications can also make bleeding more likely. If you have bleeding or clotting problems, or if you take blood-thinning medication, tell your health professional before your blood is drawn.
Results
A reticulocyte count is a blood test that measures how rapidly immature red blood cells called reticulocytes are made by the bone marrow and then released into the blood.
Normal
The reticulocyte count is usually given as the percentage of red blood cells that are reticulocytes (the number of reticulocytes divided by the total number of red blood cells, multiplied by 100).
Normal values may vary from lab to lab.
Newborns have a normal reticulocyte count of 2.5% to 6.5%. This value drops within 2 weeks to 0.5% to 2.0%.
Reticulocyte count Normal:
0.5%–2.0%
Normal values may vary from lab to lab.
Newborns have a normal reticulocyte count of 2.5% to 6.5%. This value drops within 2 weeks to 0.5% to 2.0%.
Reticulocyte count Normal:
0.5%–2.0%
High values
- A high reticulocyte count may indicate increased production of red blood cells by the bone marrow, which can be caused by bleeding, a move to high elevation, or certain types of anemia resulting in increased destruction of red blood cells (hemolysis).
- The reticulocyte count usually rises after successful treatment for pernicious anemia, iron-deficiency anemia, or folic acid deficiency anemia.
Low values
- A low reticulocyte count may indicate decreased production of red blood cells by the bone marrow, which can be caused by aplastic anemia or other types of anemia, such as iron-deficiency anemia.
- A low reticulocyte count can also be caused by exposure to radiation, a long-term (chronic) infection, or by certain medications that damage the bone marrow.
What Affects the Test
Factors that can interfere with your test and the accuracy of the results include:
- Medications, such as levodopa, corticotropin, azathioprine (Imuran), chloramphenicol (Chloromycetin), dactinomycin (Cosmegen), medications to reduce a fever, medications to treat malaria, and methotrexate and other cancer chemotherapy medications.
- Radiation therapy.
- Sulfonamide antibiotics (such as Bactrim or Septra).
- Pregnancy.
- A recent blood transfusion.
What To Think About
- In anemia, the reticulocyte count will be inaccurate because the levels of red blood cells and hemoglobin are decreased. Also, reticulocytes make up a higher percentage of the blood count in anemia, which makes the reticulocyte count appear falsely high. For this reason, a doctor will evaluate the reticulocyte count along with the reticulocyte index (RI) when monitoring anemia. The RI is a measurement that corrects the reticulocyte count for anemia, giving a more accurate picture of reticulocyte count.
- A reticulocyte count may help identify which other tests should be done to diagnose a specific type of anemia or other disease. A high reticulocyte count may indicate a need for tests to evaluate for blood loss or destruction of red blood cells (hemolysis). A low reticulocyte count may indicate a need for a bone marrow biopsy, which can determine whether there is a problem with the production of new reticulocytes by the bone marrow.
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أنتظـــر منكم المساهمة والمشاركة في الموضوع , وإضافة ما لديكم من معلومات ..
أنتظـــر منكم المساهمة والمشاركة في الموضوع , وإضافة ما لديكم من معلومات ..
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