When you pick up a blood test report, you sometimes feel a little intimidated when you see the words, letters, and numbers on it, right? In this report, which has a lot of words like CBC, Hct, and Hb, today we are talking about the test called Hematocrit, or Hct for short. This is a very simple test, and it also tells us important information about our health.
Simply put, what is this Hematocrit (Hct) test?
It's very simple. It involves taking a sample of your blood and measuring what percentage of the blood volume is made up of red blood cells .
Think about it, our blood is not made up of one thing. It has four main parts:
- Red blood cells: These are what carry oxygen throughout our bodies. They have a very important job.
- White blood cells: These are our body's defenses that fight diseases and germs that enter our body.
- Platelets: These are the ones who help stop bleeding and form blood clots when there is an injury.
- Plasma: This is the liquid part of the blood. All the other cells float in it.
So the Hematocrit test measures the percentage of red blood cells in all of these. It's very important to have the right amount of red blood cells to stay healthy, because they're what gets oxygen to the body.
What time does the doctor recommend doing this test?
There are a few common reasons why a doctor might ask you to have this test. It is often done as part of a test called a Complete Blood Count (CBC) .
- As part of a routine medical checkup that you should have annually.
- If you have symptoms of a disease that affects red blood cells (for example, constant tiredness, paleness, difficulty breathing).
- If you already have a known blood condition, monitor it.
How is this blood test done? Is there anything to be afraid of?
Oh, there's nothing to be afraid of at all. This is a very quick and simple thing to do.
Do you need to prepare before the test?
No special preparation is needed. You can eat and drink normally and take your medications. However, if you are afraid of needles, tell the staff in advance where you will have your blood drawn. They will help you relax.
What happens when blood is drawn?
This will only take a few minutes.
1. First, a medical staff member will find a good vein in your arm (usually the inside of your elbow) to draw blood from. For young children, blood is usually drawn from the heel.
2. Then, a rubber band (like a tourniquet) is placed around the upper part of the arm and tightened slightly.
3. Clean the needle insertion site with a piece of cotton.
4. Next, the doctor inserts the needle into the vein. You may feel a slight stinging sensation at that time , but it will go away in a few seconds.
5. The required amount of blood is collected in a tube.
6. Finally, the needle is removed, a piece of cotton is placed in the area, and a plaster is applied.
You can go home after donating blood. Before you go, ask when you can expect to receive the report. Usually, you will receive the report within 24 hours or a few days.
Some people may feel a little dizzy after donating blood. This is normal. If you feel that way, don't be afraid to tell the people there. They will help you.
How do I understand the values in the report?
The results of your Hematocrit (Hct) report are given as a percentage. For example, if the result is 45, it means that 45% of your blood is red blood cells.
These normal values vary depending on age and gender.
| Person | Hematocrit (Hct) normal value |
|---|---|
| Men | 41% to 50% |
| Women | 36% to 44% |
| Babies | 32% to 42% |
| Newborn babies | 45% to 61% |
Important: These normal values may vary slightly from lab to lab. So compare your results to the "Reference Range" listed on your report. Some reports may indicate a high (H) value or a low (L) value.
If the hematocrit value increases (High Hematocrit)
An Hct value that is higher than normal is medically called Erythrocytosis . Sometimes this can be due to a medical condition like `Polycythemia Vera`. But most of the time, it means that the body is producing more red blood cells because the body's cells need more oxygen.
Several reasons can cause high Hct values:
- Dehydration: This means that the body does not have enough water.
- Heart disease:
- Smoking:
- Lung diseases (Pulmonary fibrosis):
- Obstructive sleep apnea:
- Carbon monoxide poisoning:
- Taking the hormone testosterone:
- Living at high altitudes: Because the air in mountainous areas has less oxygen, the body produces more red blood cells to adapt.
If the hematocrit value decreases (Low Hematocrit)
A low Hct value often means that your body does not have enough healthy red blood cells. We call this condition anemia . Many people have to do this test because of symptoms such as constant fatigue and weakness.
Other reasons that can cause a decrease in Hct value:
- Bleeding: Due to an injury or other medical condition within the body.
- Kidney disease:
- Thyroid disease:
- Diseases like Leukemia:
- Hyponatremia: This means a decrease in sodium levels in the blood.
- Pregnancy: Due to the increase in fluid volume in the body during pregnancy, the percentage of red blood cells may appear relatively low.
Are Hematocrit and Hemoglobin two different things?
Yes. This means two. You may have seen both of these in your report.
- Hematocrit (Hct) is the percentage of red blood cells in the blood.
- Hemoglobin (Hb) is the amount of oxygen-carrying protein in red blood cells.
Simply put, Hct measures how big the red blood cells are, and Hb measures the amount of oxygen-carrying capacity within those cells.
The most important thing: Don't panic if you see a low or high value on your report. It could be a sign of a serious illness, or it could be due to a simple, temporary cause like dehydration. So instead of worrying about the worst, always discuss the report with your doctor.
Only your doctor can explain to you exactly what these results really mean and what to do next, by comparing them with the other values in your report and your symptoms.
Take-Home Message
- Hematocrit (Hct) is a simple blood test that measures the percentage of red blood cells in your blood.
- This value can be increased or decreased by serious medical conditions, as well as common causes such as smoking, dehydration, or pregnancy.
- Don't panic if you see a value on the report that is different from the normal level.
- The best and only way to resolve any questions or concerns you may have about the results of your report is to talk to your doctor.
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