
Men who are rejected from blood donations because of high hematocrit can still give blood if their physicians call in an order for a therapeutic phlebotomy at the local blood center. Lower Your TRT Dose. If you have high hemoglobin or hematocrit from testosterone therapy, then your doctor may require you to lower your dose.
Full Answer
How do doctors test hematocrit levels?
Doctors usually test hematocrit levels as part of a complete blood count (CBC). A CBC is composed of a range of tests, and may include: reticulocyte count (young red blood cells) an analysis of red blood cells, including size and shape
What is the treatment for high hematocrit?
What Is the Treatment for High Hematocrit? Treatment for a high hematocrit varies depending on the underlying cause, but patients with very high hematocrit levels may require blood letting, according to eMedicineHealth. Hematocrit that is only slightly above average generally requires no treatment.
What is the normal range of hematocrit?
Hematocrit (Hct) Levels. This is the ratio of the volume of red cells to the volume of whole blood. Normal range for hematocrit is different between the sexes and is approximately 45% to 52% for men and 37% to 48% for women. This is usually measured by spinning down a sample of blood in a test tube, which causes the red blood cells to pack at ...
What is the hematocrit and why is it important?
The hematocrit is the proportion of the blood volume that consists of red blood cells. Source: Getty Images What is the hematocrit? The hematocrit is the proportion, by volume, of the blood that consists of red blood cells.

How is hematocrit treated?
Most people are not treated with medications or procedures if the hematocrit is only slightly above or below the normal levels. Some patients with very low hematocrits may require intravenous iron, transfusions or medications to stimulate the production of red cells by the bone marrow.
What do hematocrit levels mean to a doctor?
A hematocrit test is part of a complete blood count (CBC). Measuring the proportion of red blood cells in your blood can help your doctor make a diagnosis or monitor your response to a treatment. A lower than normal hematocrit can indicate: An insufficient supply of healthy red blood cells (anemia)
Why would a doctor order a hematocrit test?
A hematocrit test is needed to check for the proportion of red blood cells. A low red blood cell count, or low hematocrit, indicates anemia. Suspected anemia is the most common reason for hematocrit testing. A hematocrit is sometimes called a HCT.
When should I worry about hematocrit?
For women, the normal range is slightly lower: 36%-44%. A hematocrit level below the normal range, meaning the person has too few red blood cells, is called anemia. A hematocrit level above the normal range, meaning too many red blood cells, may indicate polycythemia or erythrocytosis.
How much does phlebotomy lower hematocrit?
The volume of phlebotomy remained a strong predictor of drop in hemoglobin and hematocrit after adjusting for other predictors using multivariate analysis (P<. 0001). On average, every 100 mL of phlebotomy was associated with a decrease in hemoglobin and hematocrit of 7.0 g/L and 1.9%, respectively.
What diseases cause high hematocrit?
High hematocrit may be due to:Congenital heart disease.Failure of the right side of the heart.Too little water in the body (dehydration)Low levels of oxygen in the blood.Scarring or thickening of the lungs.Bone marrow disease that causes abnormal increase in red blood cells.
What are the symptoms of high hematocrit?
When a person has high hematocrit levels they tend to present with these symptoms:flushed skin.dizziness.vision problems.headaches.enlarged spleen.
What do you do when your hematocrit is high?
What to do for abnormally high hematocrit levels. Certain lifestyle changes, like quitting smoking and staying hydrated, can help lower high red blood cell counts. Staying hydrated is especially important because fluids help keep the blood from getting too concentrated.
How is a hematocrit test performed?
A medical provider will need a small sample of blood to test your hematocrit. This blood can be drawn from a finger prick or taken from a vein in your arm. If the hematocrit test is part of a CBC, a lab technician will draw blood from a vein, typically from the inside of your elbow or from the back of your hand.
Does fish oil lower hematocrit?
Blood hematocrit reduced significantly in the omega-3 fatty acids group at the end of week 10 compared with baseline (p < 0.05), whereas the reduction of blood hematocrit in the placebo group was marginally significant (p = 0.06; Table 3 ).
When is hematocrit dangerously high?
Hemoglobin levels greater than 16.5 g/dL (grams per deciliter) in women and greater than 18.5 g/dL in men suggest polycythemia. In terms of hematocrit, a value greater than 48 in women and 52 in men is indicative of polycythemia.
How is polycythemia diagnosed?
Polycythaemia can be diagnosed by carrying out a blood test to check: the number of red blood cells in your blood (red blood cell count) the amount of space the red blood cells take up in the blood (haematocrit level)
What age should I take a hematocrit test?
For children ages 17 and younger, the normal range varies by age and sex. Your hematocrit test provides just one piece of information about your health. Talk to your doctor about what your hematocrit test result means in light of the symptoms you're experiencing and the results of other diagnostic tests.
What does a lower hematocrit mean?
A lower than normal hematocrit can indicate: An insufficient supply of healthy red blood cells (anemia) A large number of white blood cells due ...
Why do I have a high hematocrit?
A higher than normal hematocrit can indicate: A disorder, such as polycythemia vera, that causes your body to produce too many red blood cells.
What are the factors that affect hematocrit?
A number of factors can affect the outcome of a hematocrit test and yield inaccurate or misleading results, including: 1 Living at a high altitude 2 Pregnancy 3 Significant recent blood loss 4 Recent blood transfusion 5 Severe dehydration
Can a doctor repeat a hematocrit test?
Your doctor will take into account possible complicating factors when interpreting the results of your hematocrit test. Your doctor may want to repeat the hematocrit test and do other blood tests if results provide conflicting or unexpected information. By Mayo Clinic Staff.
How is hematocrit evaluated?
In the laboratory, your hematocrit is evaluated using a centrifuge, which is a machine that spins at a high rate to cause the contents of your blood to separate. A lab specialist will add a special anticoagulant to keep your blood from clotting.
What is hematocrit test?
A hematocrit test can help your doctor diagnose you with a particular condition , or it can help them determine how well your body is responding to a certain treatment . The test can be ordered for a variety of reasons, but it’s most often used to test for: anemia. leukemia.
How to get blood out of your arm?
The technician will clean the surface of your skin with an antiseptic and place an elastic band, or tourniquet, around your upper arm to help the vein swell with blood. They’ll then insert a needle in the vein and collect a blood sample in one or more vials.
What are the three parts of a blood test?
When the test tube is taken out of the centrifuge, it will have settled into three parts: red blood cells. anticoagulant. plasma, or the fluid in your blood. Each component will settle in a different part of the tube, with the red blood cells moving to the bottom of the tube.
Where to draw blood for CBC?
This blood can be drawn from a finger prick or taken from a vein in your arm. If the hematocrit test is part of a CBC, a lab technician will draw blood from a vein, typically from the inside of your elbow or from the back of your hand. The technician will clean the surface of your skin with an antiseptic and place an elastic band, or tourniquet, ...
Does pregnancy affect hematocrit?
Pregnancy can decrease your blood urea nitrogen (BUN) levels due to increased fluid in your body. A recent blood transfusion can also affect your results. If you live at a high altitude, your hematocrit levels tend to be higher due to reduced amounts of oxygen in the air.
Is hematocrit a side effect?
A hematocrit test is not associated with any major side effects or risks. You may have some bleeding or throbbing at the site where the blood is drawn. Let your doctor know if you experience any swelling or bleeding that doesn’t stop within a few minutes of pressure being applied to the puncture site.
What is a hematocrit test?
A hematocrit is a simple blood test done to measure the red blood cells in a person’s blood. Red blood cells (erythrocytes) are important because they carry oxygen through your body. A low or high red blood cell count can indicate a medical condition or disease. The hematocrit test determines the number of red blood cells.
Why is hematocrit test important?
A hematocrit test is needed to check for the proportion of red blood cells. A low red blood cell count, or low hematocrit, indicates anemia. Suspected anemia is the most common reason for hematocrit testing. A hematocrit is sometimes called a HCT.
What does it feel like to draw blood with a needle?
When the needle is inserted to draw blood, you might feel a prick or moderate pain. You may bruise afterwards. The technician will cover the draw site with gauze and a small bandage. Cleveland Clinic is a non-profit academic medical center.
What causes high hematocrit?
Thyroid abnormality. Immune destruction of red blood cells. High hematocrit may be due to: Heart disease. Dehydration. Scarring or thickening of the lungs. Bone marrow disease.
What is the normal range for a blood test?
The range for normal tests varies due to age and gender, but the general guidelines are: Male: 41% to 50%. Female: 36% to 44%. For babies, normal results are: Newborn: 45% to 61%. Infant: 32% to 42%. Your doctor will determine what is normal for you or your child.
Do you need a CBC for a hematocrit test?
No preparations are needed for a hematocrit test. Your physician will perform the test in his or her office or send you to a lab for testing. A hematocrit is usually done as part of a complete blood count (CBC).
What is the normal hematocrit for a newborn?
A normal hematocrit, on the other hand, may depend on sex and age. The Normal Hematocrit Ranges: From 55 percent to 68 percent for newborns, from 29 percent to 41 percent for 1-year-old, from 42 percent to 54 percent for male adults, and 38 percent to 46 percent for female adults.
How to get hemoglobin levels up?
The following are some of the natural ways to remedy low hemoglobin and hematocrits; 1. Increase Iron Intake. Iron deficiency is one of the most common causes of low hemoglobin levels. Eating foods rich in iron, such as meat, fish, soy products, eggs, broccoli, green beans, nuts, and seeds, can boost the production of hemoglobin.
What foods help with RBCs?
2. Increase Folate Intake. Folate rich foods, such as beef, spinach, rice, peanuts, peas, beans, avocadoes, and lettuce, can help in the production of hemoglobin. Hemoglobin is composed of heme, which is produced with the help of folate.
How to get iron to absorb?
Maximize Iron Absorption. It is important to consume iron that can be found in foods or supplements. Aside from that, you also need to maximize the absorption of iron. To do this, you can take vitamin C-rich foods like strawberries, fruits, and green vegetables, as well as supplements.
What happens if your hemoglobin is low?
What Does It Mean When Your Hemoglobin And Hematocrit Are Low? 1 Nutritional deficiencies such as folate, iron, or B12 2 Excessive blood loss from chronic bleeding in the bladder, uterus, or digestive tract or severe trauma 3 Bone marrow damage from radiation, chemotherapy, toxin, drugs, or infection 4 Bone marrow disorders such as myelodysplastic syndrome, aplastic anemia, or cancers such as lymphoma, leukemia, multiple myeloma, and others related to bone marrow 5 Severe or chronic kidney failure 6 Chronic inflammatory conditions 7 Destruction of RBCs like hemolytic anemia
What is the hematocrit test?
Hematocrit (also called HCT, packed cell volume, or PCV) is measured by routine lab tests. It is the percentage of red blood cells in your blood or, in other words, the volume of red blood cells divided by the total blood volume [ 1, 2, 3 ]. Red blood cells come from the bone marrow, where they are made from stem cells.
Why is hematocrit important?
Hematocrit is a useful diagnostic tool because it can change in generally predictable ways with a health problem [ 25 ].
What is the normal hematocrit for men?
Normal hematocrit ranges are 40 to 54% for men, 36 to 48% for women, and 30 to 43% for children [ 2 ]. However, typical hematocrit can vary between populations depending on both genetic and environmental factors as well as the different measurement techniques used [ 19 ].
Why do you compare hematocrit with reference?
Your healthcare provider will compare your hematocrit levels with reference values to see if your results fall outside the range of expected values. By doing so, you and your healthcare provider can gain clues to help identify possible conditions or diseases.
What causes low hematocrit?
Low hematocrit, or anemia, can be caused by blood loss, the body making fewer red blood cells, or increased destruction of red blood cells. Symptoms of anemia can include difficulty breathing, dizziness, headache, cold skin, pale skin, and chest pain [ 72 ].
Is hematocrit good for health?
Therefore, higher hematocrit isn’t always better for health [ 5 ]. Hematocrit affects a variety of processes, from throwing off the accuracy of blood sugar measurements to controlling the behavior of platelets and blood clotting proteins [ 6, 7, 8 ].
Can you take hematocrit medication if you are already taking it?
Some drugs may reduce your hematocrit value if you are already taking them for some other health condition, but never start taking them or increase your dose for this purpose. Always follow the treatment plan prescribed by your doctor.
How to determine hematocrit?
The hematocrit can also be determined by a manual method using a centrifuge. When a tube of blood is centrifuged, the red cells will be packed into the bottom of the tube. The proportion of red cells to the total blood volume can then be visually measured.
How is hematocrit measured?
How is the hematocrit measured? The hematocrit is typically measured from a blood sample by an automated machine that makes several other measurements of the blood at the same time.
Why is hematocrit low?
A person who has a low hematocrit is referred to as being anemic. There are many reasons for anemia. Some of the more common reasons are. loss of blood (traumatic injury, surgery, bleeding, and colon cancer ), nutritional deficiency (iron, vitamin B12, folate), bone marrow problems (replacement of bone marrow by cancer, ...
What is the normal range of hematocrit?
Normal range for hematocrit is different between the sexes and is approximately 45% to 52% for men and 37% to 48% for women.
Can high hematocrits be seen in people living at high altitudes?
High hematocrits can be seen in people living at high altitudes and in chronic smokers. Dehydration produces a falsely high hematocrit that disappears when the proper fluid balance is restored. abuse of the drug erythropoietin ( Epogen) by athletes for "blood doping" purposes.
How to increase hematocrit?
Exercise in moderation. Getting in regular moderate exercise is important for your health. However, you don't want to overdo it. Exercising too rigorously can increase your hematocrit levels. Some good moderate exercises you can do are:
What is the hematocrit level?
Your hematocrit level is the amount of red blood cells present in your blood. For adult males, it should be around 45% of your blood; for adult females, around 40%. The hematocrit level is an important determining factor in diagnosing different illnesses.
Why does my skin itch when I have a high hematocrit level?
Here's how: Itching. Itching is caused by the histamine secreted by the body in reaction to a high hematocrit level. Histamine is a chemical messenger involved in inflammation and allergy.
What is a high hematocrit count?
Those with high hematocrit counts often suffer from "tachypnea.". This is just a medical term that refers to a fast breathing pattern of more than 20 cycles per minute. This is a short-term compensatory mechanism of the body in response to a poor delivery of oxygen.
What causes a high hematocrit level?
High hematocrit levels are commonly caused by lung and heart disease, as well as dehydration. An increase in hematocrit level means that you may be experiencing shock or hypoxia – a condition where there is a depleted amount of oxygen circulating in your body.
What causes elevated hematocrit?
Elevated hematocrit levels may be related to a different disease entirely, namely variations in cancer and a potential tumor. Tumors and cancer – especially in the bone marrow – create an uncontrolled production of blood cells.
How much fluid should I drink to lower my hematocrit?
Aim for an intake of 2 liters (0.5 US gal) a day or more to keep a normal hematocrit level.
Why do doctors check hematocrit?
Dehydration can raise hematocrit levels, so this test is useful if a doctor suspects severe dehydration is the cause of a person’s symptoms. A doctor may request frequent hematocrit tests to monitor the effect of chemotherapy on person’s bone marrow.
What is the hematocrit level of a person with 50 ml of blood?
For example: if a person has 50 milliliters (ml) of red blood cells in 100 ml of blood, their hematocrit level is 50%. Red blood cells transport oxygen around the body and give blood its characteristic red color. In addition to oxygen, they also contain hemoglobin, a protein that binds to oxygen molecules.
What does it mean when your hematocrit is low?
A doctor may choose to test an individual’s hematocrit level due to certain symptoms. A low hematocrit level means the are too few red blood cells in the body. In these cases, a person may experience symptoms that signal anemia.
What does hematocrit mean?
Contacting a doctor. Summary. Hematocrit is the percentage of red blood cells in a person’s blood. Low red blood cell levels indicate conditions such as anemia. High red blood cell levels could signal polycythemia, which can increase a person’s chance of developing a blood clot. If a person feels tired, dizzy, or short of breath, ...
What are the symptoms of high hematocrit?
A person should speak with a doctor if they are experiencing any of the symptoms listed above that could be a sign of high or low hematocrit levels, including fatigue, weakness, vision problems, and dizziness.
Is hematocrit high or low?
Both high and low hematocrit levels can be detrimental to a person’s health, and can result from a variety of conditions and lifestyle factors. Read on to learn more about what this measure of red blood cell volume means, symptoms of abnormal levels, and what low and high levels might indicate.
Does exercise affect hematocrit?
According to research, red blood cell counts tend to increase at high altitude. Exercise, particularly strength training, may also affect hematocrit levels. A 2018 study found that females who participated in 16 weeks of strength exercise had lower levels at the end compared when they started.
Where is bone marrow removed?
In a bone marrow aspiration, a doctor or nurse uses a thin needle to remove a small amount of liquid bone marrow, usually from a spot in the back of your hipbone (pelvis). A bone marrow biopsy is often done at the same time. This second procedure removes a small piece of bone tissue and the enclosed marrow. If your doctor suspects that you have ...
How to get rid of polycythemia vera?
You can take steps to help yourself feel better if you've been diagnosed with polycythemia vera. Try to: Exercise. Moderate exercise, such as walking, can improve your blood flow. This helps decrease your risk of blood clots. Leg and ankle stretches and exercises also can improve your blood circulation. Avoid tobacco.
What is the best treatment for itching?
If you have bothersome itching, your doctor may prescribe medication, such as antihistamines, or recommend ultraviolet light treatment to relieve your discomfort. Medications that are normally used to treat depression, called selective serotonin reuptake inhibitors (SSRIs), helped relieve itching in clinical trials.

Overview
Why It's Done
- A hematocrit test is part of a complete blood count (CBC). Measuring the proportion of red blood cells in your blood can help your doctor make a diagnosis or monitor your response to a treatment. A lower than normal hematocrit can indicate: 1. An insufficient supply of healthy red blood cells (anemia) 2. A large number of white blood cells due to l...
How You Prepare
- The hematocrit is a simple blood test. You won't need to fast before the test or make other preparations.
What You Can Expect
- The blood sample is generally drawn with a needle from a vein in your arm. You may feel some tenderness at the site, but you'll be able to resume normal activities afterward.
Results
- Results from your hematocrit test are reported as the percentage of your blood volume that's composed of red blood cells. Normal ranges vary substantially with race, age and sex. The definition of normal red-blood cell percentage also varies from one medical practice to another. Generally, a normal range is considered to be: 1. For men, 38.3 to 48.6 percent 2. For women, 35.…