Did the doctor give you a blood test and see that it said 'Serological Test' and you were a little worried? Did you think, "What kind of strange test is this?"? Don't be scared at all. This is a very common blood test that is done very often. So let's talk about it all, very simply, today.
Simply put, what is a serological test?
A serological test is a test that takes a sample of your blood and checks it for antibodies . Now you're probably wondering, "What are these antibodies?"
Imagine, when a germ, such as a virus or bacteria, enters our body from outside, our body's defense system, the immune system, produces a special type of protein to fight against these foreign invaders. That's what we call antibodies .
Simply put, these antibodies are like the soldiers in our bodies. Having antibodies in your blood for a certain disease means that you have either already had that disease, or have had it in the past and recovered, or have been given a vaccine for that disease.
Doctors can give the results of this test in several ways.
| The method that gives the result | Simply meaning |
|---|---|
| Qualitatively | This only tells you whether antibodies are present or not. For example, the result may be "Positive" , "Negative" , or "Indeterminate" . |
| Quantitatively | This shows how many antibodies are in your blood, in a numerical value. That is, it tells you what the antibody concentration is. |
| Semi-quantitatively | This tests how strong the antibodies in your blood are. The blood sample is diluted and tested. This is given a titer value. |
What diseases can be detected with this test?
This test can detect antibodies related to a variety of diseases. There are two main categories of antibodies.
| Disease category | Examples |
|---|---|
| Various infections |
|
| Autoimmune Diseases |
What are Autoimmune Diseases?
This is when our body's defense system malfunctions and starts attacking our own healthy cells instead of foreign pathogens. This serological test is also used to detect such conditions.
When is a serological test done?
There may be several reasons why a doctor might ask you to have this test.
- Find out if you have had any previous infections: For example, this test is done to see if you have had a disease like dengue.
- Decide whether to get vaccinated: Some diseases can be prevented by checking whether you have natural immunity to them. For example, checking for immunity to rubella before becoming pregnant.
- Check if a vaccine worked properly: After you have been given a vaccine, make sure that the appropriate protection, that is, antibodies, are properly formed in your body.
- Complete the paperwork required for school or work: Sometimes, if you don't have records to prove you've been vaccinated before, you can take this test to show that you have immunity.
- Identify autoimmune diseases: As mentioned earlier, if there is any suspicion of the disease.
How is this test done? What should we expect?
This is a very simple, quick process.
Do you need to prepare before the test?
- No special preparation is required. However , it is important to tell your doctor or the person who is taking your blood about all the medications (prescribed and over-the-counter), vitamins, and supplements you are taking. Some medications can increase the risk of bleeding.
- If you're afraid of needles, don't be shy about mentioning it. They can help calm you down and make the experience easier for you.
What happens when blood is drawn?
This is usually done by a nurse or a phlebotomist who is specially trained to draw blood. When drawing blood from a vein in your arm, these steps are followed:
1. First, an elastic band is placed just above your elbow to make the veins stand out and increase blood flow.
2. Then, clean the piercing site thoroughly with an antiseptic to reduce the risk of infection.
3. They tell you to shake hands.
4. Then a very fine needle (a little smaller than the tip of a regular earring) is inserted into the vein. You may feel a slight stinging pain at this time.
5. The required amount of blood is collected into a tube. Sometimes blood may be collected into several tubes.
6. Once the blood is drawn, the needle is removed and a plaster or piece of cotton is placed over the site to hold it in place. The elastic band is also removed and replaced.
Sometimes, if only a small amount of blood is needed, a small prick of the tip of a finger can be used to obtain a drop of blood. For small babies, a small prick of the heel is used to obtain a blood sample.
Is there any risk in this?
This is generally a very safe test , but as with anything, there are a few things that can happen very rarely.
- Feeling dizzy and faint after donating blood.
- Slight pain or bruising at the puncture site.
- Bruising at the puncture site.
- Very rare infection.
What do the results say?
Results can usually be obtained within a few days.
Interpreting the results of a serological test can be a bit complicated because it varies depending on the disease being tested.
- A high antibody result may indicate that you have had a previous infection.
- A low antibody result may mean that your immune system has completely suppressed the infection.
The most important thing is, don't jump to conclusions based on the values in your report. Only your doctor can explain it to you and tell you what to do next.
If the results are abnormal, your doctor may ask you to do some more tests or start treatment.
Take-Home Message
- A serological test is a routine blood test that looks for antibodies in your blood.
- This can detect things like previous infections, immunity from vaccines, and autoimmune diseases.
- The process of donating blood is very simple, quick, and very safe. You only feel a little pain during the procedure.
- Inform the doctor or nurse about all medications you are taking before having your blood drawn.
- Always discuss the results of your test report with your doctor and seek advice, rather than jumping to conclusions on your own.
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