Indirect Coombs
The Indirect Coombs test detects antibodies against red blood cells in the blood. It is essential for pregnancy screening and blood transfusion safety.
Turnaround time
2 days
Biomarkers count
1
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Details about Indirect Coombs
What is the Indirect Coombs test?
The Indirect Coombs test, also known as the Indirect Antiglobulin Test (IAT), is a blood test used to detect circulating antibodies that may react against red blood cells (RBCs).
Unlike the Direct Coombs test, which looks for antibodies already attached to red blood cells, the Indirect Coombs test identifies free antibodies present in the serum. These antibodies can cause destruction of red blood cells under certain conditions, such as during pregnancy or blood transfusion.
The test plays a critical role in prenatal screening, transfusion medicine, and investigation of immune-mediated anaemias.
Why do I need an Indirect Coombs test?
The Indirect Coombs test is used to identify antibodies that could cause haemolytic reactions, particularly in pregnancy or following transfusion.
You may need an Indirect Coombs test if you:
- Are pregnant or planning pregnancy
- Have Rh-negative blood type
- Are undergoing blood transfusion screening
- Have a history of transfusion reactions
- Are being investigated for immune haemolytic anaemia
- Have unexplained anaemia
- Require antibody screening before surgery
Clinical situations where this test is essential include:
- Antenatal antibody screening
- Blood group compatibility testing
- Investigation of haemolytic disease of the newborn
- Pre-transfusion safety checks
Benefits of the Indirect Coombs test
- Detects red blood cell antibodies
Identifies antibodies that may cause haemolysis. - Essential in pregnancy care
Protects against haemolytic disease of the fetus and newborn. - Improves blood transfusion safety
Prevents transfusion reactions. - Clinically established screening test
Used routinely in NHS and private care. - Supports investigation of anaemia
Identifies immune-mediated causes. - Guides Rh incompatibility management
Critical for Rh-negative mothers. - Simple blood test
Requires only a serum sample. - Supports early clinical intervention
Enables timely treatment and monitoring.
Step by step – how the test works
You can access Indirect Coombs testing UK-wide through two options:
- Clinic appointment
Attend your nearest UK clinic, where a healthcare professional will take your blood sample. - At-home or hotel visit (£60 extra)
A qualified phlebotomist comes to your home or hotel, so you don’t need to travel.
Your sample is analysed in an accredited UK laboratory, and results are delivered securely.
Your results explained
Negative Indirect Coombs test
No red blood cell antibodies detected.
Typical UK interpretation:
- Indirect Coombs: Negative
Positive Indirect Coombs test
Red blood cell antibodies detected. Further antibody identification is required.
Typical UK interpretation:
- Indirect Coombs: Positive
Clinical significance varies
Some antibodies are clinically significant, while others may not cause problems. Interpretation depends on antibody type and clinical context.
How It Works
Simple steps to get your results
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Visit or Test at Home
Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.