Indirect Coombs Test and Rh Antibody Titre

Also referred as

Rh Antibody Titration

Indirect Coombs Test

Indirect Antiglobulin Test

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The Indirect Coombs Test and Rh Antibody Titre test detects antibodies against red blood cells, especially Rh incompatibility. This test is especially important during pregnancy to assess the risk of complications between the mother and fetus, as well as before blood transfusions to ensure compatibility and prevent adverse reactions. Early detection through this test helps guide timely medical intervention and improves overall safety in both prenatal care and transfusion practices.

Note: If the Indirect Coombs Test (ICT) is negative, it means no detectable antibodies against red blood cells are present in the blood at the time of testing. No Rh antibody titre test is needed, since there are no antibodies to measure. Routine follow-up screening may still be advised during pregnancy, as antibodies can develop later.

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Understanding Indirect Coombs Test and Rh Antibody Titre

The Indirect Coombs Test and Rh Antibody Titre comprises important immunohematology tests used to identify antibodies in the blood that may attack red blood cells. These antibodies can develop when a person is exposed to foreign red blood cell antigens, such as during pregnancy or after a blood transfusion.

The Rh antibody titre specifically checks for antibodies against the Rh factor, a protein present on the surface of red blood cells. If an Rh-negative individual is exposed to Rh-positive blood, their immune system may produce antibodies against it. This is especially significant during pregnancy, where an Rh-negative mother carrying an Rh-positive baby may develop antibodies that can cross the placenta and harm the baby’s red blood cells. This leads to hemolytic disease of the newborn (HDN).

The Indirect Coombs Test (Indirect Antiglobulin Test) detects freely circulating antibodies in the blood that are capable of binding to red blood cells. It is commonly used as part of prenatal screening and before blood transfusions to ensure compatibility between donor and recipient blood.

The Indirect Coombs Test and Rh Antibody Titre is recommended during pregnancy (especially in the first trimester and follow-ups), before blood transfusions, or when there is a suspicion of immune-mediated hemolysis. It plays a crucial role in preventing complications such as transfusion reactions and fetal anemia.

No special preparation is required for this test. However, it is mandatory to fill out the Coombs (Direct/Indirect) form. Also, inform your doctor about all your medications, as some can affect the test results, potentially requiring dosage adjustments or temporary discontinuation. Always discuss your test results with your doctor, as ranges can vary by lab and individual health needs.

What does Indirect Coombs Test and Rh Antibody Titre measure?

Contains 2 tests

The Indirect Coombs Test and Rh Antibody Titre test measures the presence of antibodies in the blood that target red blood cells. These antibodies are produced by the immune system when it recognizes foreign antigens on red blood cells.

The Rh antibody titre specifically detects antibodies against the Rh factor, particularly the D antigen. If these antibodies are present, they can attack Rh-positive red blood cells, leading to their destruction. This test not only identifies the presence of Rh antibodies but also determines their concentration (titre). The Indirect Coombs test detects circulating (unbound) antibodies in the serum that may bind to red blood cells. A positive result indicates the presence of antibodies that may cause complications such as transfusion reactions or fetal red cell destruction. A negative result means no detectable harmful antibodies are present at the time of testing.

Coombs Test - Indirect

The Coombs Test - Indirect measures the presence of antibodies in a person's serum that can react with specific antigens on red blood cells. These antibodies are proteins produced by the immune system in response to perceived threats, such as foreign blood group antigens or altered self-antigens in autoimmune conditions. A positive test result suggests the presence of potentially incompatible antibodies, prompting doctors to conduct careful blood type matching before any transfusion.

Furthermore, this test is vital in diagnosing autoimmune hemolytic anemia, where the immune system mistakenly targets the body’s own red blood cells. By revealing the presence of autoantibodies, the Coombs Indirect Test aids in formulating appropriate treatment plans. Overall, the test is essential not only for ensuring safe blood transfusions but also for managing various conditions related to antibody-mediated red blood cell destruction, thus safeguarding individuals' health.

Know more about Coombs Test - Indirect

Rh Antibody Titre, Serum

Test Information is reviewed by: Dr. Swati Gupta (Anand), MD Lab Medicine, MBBS and written by Dr. Swati Gupta, PhD, M.Tech . The test details are for information purpose only. Consult a doctor before taking any test. Last updated on: 26th Sep 2026

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Indirect Coombs Test and Rh Antibody Titre test price for other cities

Price in	New Delhi	Rs. 1200
Price in	Bangalore	Rs. 1200
Price in	Pune	Rs. 1200
Price in	Hyderabad	Rs. 1200
Price in	Mumbai	Rs. 1200

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FAQs related to Indirect Coombs Test and Rh Antibody Titre

What is the purpose of the Indirect Coombs Test and Rh Antibody Titre test?

It is used to detect antibodies against red blood cells, especially for identifying Rh incompatibility during pregnancy and ensuring safe blood transfusions.

When is this test recommended?

It is recommended during pregnancy, before blood transfusion, or when there is a suspicion of antibody-mediated red blood cell destruction.

What does a positive result mean?

A positive result indicates the presence of antibodies that may attack red blood cells, which can lead to complications in pregnancy or transfusion.

What does a negative result mean?

A negative result means that no significant antibodies against red blood cells were detected.

What other tests may be ordered with the Indirect Coombs Test and Rh Antibody Titre test?

Doctors may also order blood group and Rh typing, the direct Coombs test, complete blood count (CBC), and ultrasound examinations to monitor fetal health and detect complications related to Rh incompatibility.

Do I need to fast before the test?

No fasting is required before this test.

How is the Indirect Coombs Test and Rh Antibody Titre test done?

The test is performed by collecting a blood sample from a vein in your arm. The sample is analyzed in a laboratory to detect antibodies.

Is there any risk associated with the Indirect Coombs Test and Rh Antibody Titre test?

The test is generally safe. You may experience mild pain, bruising, or slight swelling at the blood draw site.

How does Tata 1mg ensure accurate lab test results?

Tata 1mg ensures accurate lab test results through certified laboratories that use advanced technology and adhere to stringent quality control measures. This commitment to high standards guarantees reliable results.

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