About Careers Internship MedBlogs Contact us

Bombay Blood Group

Font : A-A+


Bombay blood group is a rare blood type in which the affected individuals have an H antigen deficiency.


Bombay blood group is a rare blood type that was first discovered in a patient of Bombay, now called Mumbai. It is a rare condition and has been reported in 1 of 10,000 individuals in India and 1 in a million people in Europe.

Bombay Blood Group

People with Bombay blood group appear that they have an O blood group; however, they suffer from a reaction if they are transfused with any other blood group including O blood.

Why does this happen? This happens because the person lacks an antigen called the H antigen. The H antigen is a precursor protein that gives rise to the A and B antigens, on the basis of which people are classified into the A, B or AB blood groups. Normally, people with the O blood group do not convert H to A or B. Thus, they have large amounts of H antigen. On the other hand, people with Bombay blood group have the O blood group, but have one difference - they do not have the H antigen. They are said to have the Oh blood group and are described as h/h. Some of these individuals can make a small amount of H antigen, which appears in the secretions. These people are said to have the para-Bombay phenotype.

It is also important to remember that people with Bombay blood group can donate blood only to those of this group.


Because Bombay blood group is very rare, a database of individuals of this blood group is maintained so that these individuals can help each other at times of need. The situation is even more difficult if a person with a Bombay blood group develops thalassemia, a condition that requires frequent blood transfusions. Women with Bombay blood group may theoretically deliver babies with hemolytic disease of the newborn if the baby does not inherit the same blood type, though such cases are not known as yet.

Some tips to remember if you have Bombay blood group:

  • Enter your name in one of the databases that keeps information about individuals with Bombay blood group.
  • If you are in good health, do consider donating your blood to those of the same blood group in times of need. At the same time, it is better not to donate at regular camps but only when the need arises to prevent wastage of blood.
  • Try to maintain a healthy lifestyle and as far as possible, avoid situations that will raise the requirement for blood.

Finally, the presence of the Bombay blood group does not mean that you suffer from any illness. It just means that you are a little different. In fact, it also means that you are special, for you can help some individuals whom many others may be unable to help.


  1. The Hh blood group - (http://www.ncbi.nlm.nih.gov/books/NBK2268/)

Latest Publications and Research on Bombay Blood Group

Citations   close

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Dr. Simi Paknikar. (2014, September 23). Bombay Blood Group. Medindia. Retrieved on Jun 27, 2022 from https://www.medindia.net/patients/patientinfo/bombay-blood-group.htm.

  • MLA

    Dr. Simi Paknikar. "Bombay Blood Group". Medindia. Jun 27, 2022. <https://www.medindia.net/patients/patientinfo/bombay-blood-group.htm>.

  • Chicago

    Dr. Simi Paknikar. "Bombay Blood Group". Medindia. https://www.medindia.net/patients/patientinfo/bombay-blood-group.htm. (accessed Jun 27, 2022).

  • Harvard

    Dr. Simi Paknikar. 2021. Bombay Blood Group. Medindia, viewed Jun 27, 2022, https://www.medindia.net/patients/patientinfo/bombay-blood-group.htm.

Post a Comment

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.



HI....one point i want to share.. A person can donate this blood group only once in 3 months and this Blood group can not be stored for long periods of time.


Is there any possible diseases that caused due to this blood group?

Recommended Reading
Health Topics A - Z

    What's New on Medindia
    COVID Toes
    International Yoga Day 2022 - 'Yoga for Humanity'
    Wearable Devices Are Now Transforming Depression, Multiple Sclerosis, and Epilepsy Management.
    View all

    Medindia Newsletters Subscribe to our Free Newsletters!
    Terms & Conditions and Privacy Policy.

    Most Popular on Medindia

    Daily Calorie Requirements Iron Intake Calculator Loram (2 mg) (Lorazepam) Post-Nasal Drip Selfie Addiction Calculator Indian Medical Journals Noscaphene (Noscapine) Blood Donation - Recipients Drug Interaction Checker Pregnancy Confirmation Calculator

    Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

    © All Rights Reserved 1997 - 2022

    This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use