Only about 3 in 1,000 Thais are Rh-negative, according to the Thai Red Cross National Blood Centre, so Rh-negative blood is much scarcer in Thailand than in Europe. The blood service manages this with a register of Rh-negative donors who can be called in, but if you are Rh-negative you should know your blood group, carry proof of it and have insurance that works before you need it.
Your blood group has two parts: the letter (A, B, AB or O) and the Rh factor, positive or negative. A person who is Rh-negative must receive Rh-negative blood in a transfusion. In Thailand the Thai Red Cross puts the share at about 0.3 percent, which is why it calls Rh-negative a "special" blood group.
This page explains what that means for a visitor or resident with Rh-negative blood, how the Thai donor system works and what pregnant travelers should discuss with their own doctor. It is general information, not medical advice. For how hospital care and payment work in Thailand, see our guide to hospitals in Thailand.
Rh-negative blood in Thailand
- Share of Thais who are Rh-negative
- About 0.3 % (3 in 1,000), Thai Red Cross
- Who manages blood supply
- Thai Red Cross National Blood Centre, Henri Dunant Road, Pathum Wan, Bangkok
- Main number
- 0 2263 9600-99
- Rh-negative donor club appointments
- 0 2252 1637 or 08 5149 9089
- Medical emergency
- 1669
- Sources checked
- Thai Red Cross pages, 19 October 2026
How rare it is, and why that matters
The Thai Red Cross says about 99.7 percent of Thais are Rh-positive. Visitors from countries where Rh-negative blood is more common, including much of Europe, should not assume that a Thai hospital has the same stocks as their hospital at home. Do not rely on a share you remember from home either; the Thai figure is the one that counts here.
Scarce does not mean unavailable. The National Blood Centre publishes its daily need for each Rh-negative group on its home page. On 5 October 2026, for example, it was still looking for 437 units of O Rh-negative and 162 of A Rh-negative. Those figures change daily, but they show that stocks are actively managed and that the center relies on donors coming in.
The Thai Red Cross Rh-negative donor club
The register you may have read about is the Rh negative Club of the National Blood Centre, founded on 26 May 1989. Rh-negative donors join so that the center can call them when blood is needed, and the club page asks regular donors to give every three months to keep stocks adequate.
The center's own figures on how many such donors exist do not match. The club page says there are "only 6,388" Rh-negative donors nationwide, with no date. An infographic on another page of the same site gives 6,789 Rh-negative donors in 2022 and a larger total of 14,657. Treat both as a sign of a small pool rather than as a current count.
Know your exact blood group before you fly. If you do not know it, ask your doctor at home or use a past hospital record. Write it on a card with your passport, add it to your phone's emergency medical information, and tell your travel companions. In an emergency, the hospital will still test your blood; the card simply makes your needs clear from the start.
What to prepare if you are Rh-negative
A transfusion is rarely part of anyone's travel plans. The preparation is the same as for any traveler, done a little more carefully:
- Have travel or health insurance with a 24-hour assistance line, and save that number. Our travel insurance guide explains what a policy should cover; residents can read our page on health insurance for expats.
- Save 1669, the national ambulance number, and the other lines in our list of emergency numbers in Thailand.
- Think about where you stay. Large hospitals are in Bangkok and the provincial centers; small islands have clinics. Our page on medical care on Koh Lipe shows what a remote island can and cannot offer.
- Take extra care on the roads, especially on two wheels; our guide to safe scooter riding covers helmets and licenses.
If you have a condition that makes transfusion more likely, ask your own specialist before you travel how they would plan for it. Long stays need more planning than a two-week holiday; our page on wintering in Thailand covers insurance and choosing a base for several months.
Pregnancy and Rh-negative mothers
The Thai Red Cross explains why Rh status matters in pregnancy: an Rh-negative woman who has developed anti-D antibodies can put an Rh-positive baby at risk, with anemia in the womb and jaundice after birth. Managing this is part of normal antenatal care at home, and it is a matter for your midwife or obstetrician, not for this page.
What you can do is plan. Before you book, ask your own doctor whether your antenatal plan includes any treatment that might fall during your trip, and get a written summary of your blood group, antibody status and pregnancy notes in English. We could not confirm from an official source which Thai hospitals stock the anti-D treatment used in pregnancy, so ask your insurer's assistance team to check with a hospital near where you will stay. Our guide to traveling to Thailand while pregnant covers airlines, Zika and insurance.
Bleeding in pregnancy is an emergency, wherever you are. Any vaginal bleeding, strong abdominal pain, a fall or a road accident during pregnancy needs a doctor at once. Call 1669 or go to the nearest hospital, show your blood-group card and pregnancy notes, and then call your insurer.
Donating blood in Thailand as a foreigner
Some Rh-negative visitors and residents want to give back by donating. The National Blood Centre publishes an English blood donation application form and an English informed-consent form, and its eligibility list contains no nationality rule. We found no page that states whether a tourist without residence is accepted, so call the center before you go.
The eligibility rules decide most cases. According to the center, donors must be 17 to 70 years old, weigh at least 45 kg and have slept at least five hours. Several rules catch foreigners in particular:
- No donation if you lived in the United Kingdom for more than three months in total between 1980 and 1996, or in France or Ireland for more than five years between 1980 and 2001.
- A four-month wait after a tattoo, piercing, acupuncture or cosmetic injection, which matters if you got a tattoo on this trip.
- No donation within a year of being in a malaria-endemic area, or within a month of dengue, Zika, chikungunya, flu or COVID-19.
- No alcohol in the 24 hours before, and a seven-day wait after diarrhea.
If you have had dengue on this trip, our page on dengue fever in Thailand explains the illness itself.
Frequently asked questions
Is O-negative blood rare in Thailand?
Yes. The Thai Red Cross says only about 0.3 percent of Thais are Rh-negative, across all groups. In 2022 its O Rh-negative donors numbered 2,741, the largest of the Rh-negative groups but still a small pool compared with Europe.
Can a Rh-negative person get blood in a Thai hospital?
The Thai Red Cross keeps a register of Rh-negative donors so they can be called when needed, and publishes its daily need for Rh-negative units. Supply is managed, not unlimited, which is why knowing your group and having insurance matters.
Can foreigners donate blood in Thailand?
The National Blood Centre publishes English donor forms and has no nationality rule in its eligibility list. Rules on UK residence between 1980 and 1996, recent tattoos and malaria areas exclude many visitors. Call the center first if you are on a short stay.
Should I travel to Thailand if I am pregnant and Rh-negative?
That is a decision for you and your own doctor or midwife. Ask them how your antenatal care would continue during the trip, get your notes and blood-group details in writing, and check that your insurance covers pregnancy care abroad.
Sources
- Thai Red Cross National Blood Centre – Blood group systems (checked October 2026)
- Thai Red Cross National Blood Centre – Rh negative Club (checked October 2026)
- Thai Red Cross National Blood Centre – Rh-negative blood (donor statistics) (checked October 2026)
- Thai Red Cross National Blood Centre – Donor eligibility (checked October 2026)
- Thai Red Cross National Blood Centre – Documents for blood donors (checked October 2026)
- Thai Red Cross National Blood Centre – Daily blood needs (home page) (checked October 2026)