# Accomodations for blood transfusion

Are there accomodations for blood transfusion (could/may be rare cases) on crewed space missions? That is, facilities for storing blood bottles for transfusion matching the blood group of astronauts. Wikipedia's space medicine doesn't seem to say either way.

• The 2000 era manuals are at spaceref.com/iss/medical.ops.html and do not include any procedures or instructions. What I've not found to make this an answer is an actual inventory to identify if the equipment was held onboard. I suspect the intention is that any injury severe enough to need transfusion would result in return to earth. Aug 17, 2021 at 8:43
• Thanks for the hyperlink and the pdfs. Burns, Collapsed Lungs, Head & Neck Injury, Abdominal injury and other diseases may require a blood transfusion for the Astronaut/s on the spacecraft?. Returning back to Planet Earth is the only option? Adequate Blood bottles storage facilities (Blood Banks) on the Spacecraft will assist. Aug 18, 2021 at 2:00
• I did not read the every process but all of them seem to presuppose doing just enough to survive return. Note that raw blood has a 30 day shelf life and needs working fridges so not reliable on ISS with months between uplifts. What I was surprised to not see was any mention of drawing blood from a compatible healthy crew member for immediate use. Aug 18, 2021 at 9:00
• Thank you. Do you feel in terms of ISS innovation, modern spacecrafts can be built having refrigeration of Blood Banks for a long duration? Aug 18, 2021 at 11:32
• I'm removing the facility tag from your question, as our meaning of that is for buildings on the ground, not spacecraft in space. Aug 18, 2021 at 20:44

In the case of the ISS various public lists of procedures and equipment do not include instructions or equipment required for blood transfusion. The 2016 list does include equipment to provide saline and procedures and equipment to overcome the absence of gravity appear to have existed since 1993.

It is possible the relevant instructions and equipment are not included in publics lists for various reasons but it is more likely that assessment of the likely injuries on the ISS and the costs involved in supplying multiple blood types of ~30 day shelf life and only when carefully temperature controlled.

Cargo to ISS is infrequent, costing thousands of dollars per kg and not normally refrigerated, so fresh blood would involve more frequent launches and extensive customization of the craft noting power and heat dissipation needed (just packing in dry ice will not fly, literally). There would also need to be safe disposal of non trivial quantities of stale blood every month, where the ISS has occasionally had issues with downmass.

The second element is the actual use for transfusion following injury. For most of the relevant period the ISS had a crew of three, so the assumed action on injury in the linked documents appears to be to stabilise the patient as much as possible and return with hours. While it is possible to die from blood lose in this time frame, the question would be which injuries the surviving two crew could do something useful about with the skills and equipment to hand in the additional time.

It does appear at some point between 2000 and 2016 the on orbit inventory grew to include saline IV solution and equipment to access the bone marrow of the leg to supply it. Saline has a near unlimited shelf life, does not need type match and while not as effective will still sustain circulation in the short term.

Possibly also relevant here is likely injuries - in 0G falling or being fallen on is unlikely, and fire and explosion hazards are rigorously minimised, making the possible events that badly maim a crew member but does not also expose them to space rather limited.

I suspect that if monthly launches of refrigerated cargo was being done most ISS crew would prefer fresh vegetables to blood.

In terms of future space exploration, once your crew size goes past six it becomes rather more likely you will have compatible blood types and the specialized skills to allow collection of donor blood in situ, though hopefully the possibility of injury will remain low through careful engineering.

Crewed space missions are very unlikely to need transfusions. Most people will never need a transfusion during their lives. And if they do, it will likely be when they are elderly. Most transfusions are for cardiovascular surgery, transplant surgery, during cancer treatment or for complications of pregnancy.

Since the above conditions are unlikely to apply to crewed space missions, about the only indication for blood transfusion aboard a space craft is hypovolemic shock (low blood volume) following traumatic blood loss.

Fatal hypovolemic shock occurs with the loss of 2 liters of blood (40% of total blood volume). Of that lost volume, just under half is red blood cells and the rest is clear plasma. It is natural to assume the red stuff is more important. But in terms of treatment, the essential thing is to replace lost volume. Red cells are good, but optional. The other 60% of the remaining blood, if diluted to maintain volume, can provide ample oxygen carrying capacity.

What therapies are available to maintain intravascular volume following hemorrhage?

1. Saline. This is basically salt water, the same saltiness as body fluids. It is cheap and easily stored. It can be administered through an IV, into bone marrow (ouch) or via FRVR (fluid replacement via rectum). The downside is that saline becomes widely distributed in the body, so for every liter administered, only about 20% stays in the vascular space.

2. Colloids (albumin, fresh frozen blood plasma, Dextran and other synthetics). These fluids stay inside the vascular space, so are better at maintaining volume. They don’t result in lower mortality for hospitalized shock patients but may play some role in space medicine due to long evacuation delays.

3. Military Anti-Shock Trousers (MAST pants). These inflatable pants put pneumatic pressure on the legs and lower abdomen, giving an autotransfusion and also increasing peripheral vascular resistance. They were widely used for air evacuations during the Vietnam War, but have fallen from favor except for a few clear indications (pelvic fracture, uncontrollable leg hemorrhage, severe traumatic hypotension). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2700619

4. A Walking Blood Bank uses pre-tested “walking donor” blood to donate blood immediately before use. In an ISS setting, this would involve pre-mission screening and cross-matching of all crew for blood type and other transfusion incompatibilities. https://onlinelibrary.wiley.com/doi/full/10.1111/trf.15184 . It doesn’t guarantee every crew member will be matched with a compatible donor on every crew.