TME 86: Who Actually Needs Blood? (It's Not Who You Think)

Ask someone why blood donation matters and they'll say accidents. Road crashes. Emergencies. Bleeding.

They're not wrong. But they're missing 80% of the picture.

Blood transfusion is not just an emergency intervention. It's a daily requirement of modern medicine. Hospitals don't use blood only when something goes wrong. They use it when things are going right, when planned surgeries happen on schedule, when chemotherapy protocols continue without interruption, when a pregnant woman with severe anaemia is supported through her third trimester.

The demand is constant. The patients are varied. The reasons are different. And the urgency changes depending on the disease, the region, and the patient sitting in front of you.

Trauma and accidents: the obvious one

This is what everyone pictures.

A road accident victim arrives in haemorrhagic shock. Blood pressure dropping. Organs starving for oxygen. The trauma team has minutes, not hours.

A single trauma patient may need 4 to 6 units of red cells, 4 to 8 units of plasma, and platelets. In massive haemorrhage protocols, the ratio matters. Too many red cells without plasma leads to coagulation failure. Too much plasma without red cells doesn't carry enough oxygen.

Here's the critical detail: this blood cannot be arranged in real time. Crossmatching takes 30 to 60 minutes. Donor screening, collection, testing, and processing takes hours. The blood that saves a trauma patient tonight was donated days ago. It was already tested, grouped, and sitting in a blood bank refrigerator at 2 to 6 degrees Celsius.

When people say "I'll donate when there's an emergency," they don't realise the system doesn't work that way. The emergency needs blood that already exists. Donation is preparation, not response.

Pregnancy and childbirth: the silent killer

Postpartum haemorrhage, severe bleeding after delivery, remains one of the top causes of maternal death globally. The WHO estimates that roughly 14 million women experience postpartum haemorrhage every year. In countries where blood is not readily available, many of them die.

But it's not only delivery complications. Pregnant women with severe anaemia (haemoglobin below 7 g/dL) sometimes need transfusion during pregnancy itself to protect both mother and child. In South Asia and Sub-Saharan Africa, where anaemia prevalence among women of reproductive age exceeds 50% in many regions, this is not rare. It is routine.

The blood product needed here is usually packed red cells. Sometimes, in cases of massive obstetric haemorrhage, fresh frozen plasma and platelets are also required. The speed of availability determines the outcome. A delay of even 15 to 20 minutes in a severe postpartum bleed can be the difference between survival and death.

Children with cancer: the hidden dependency

This one surprises people. When a child receives chemotherapy for leukaemia, lymphoma, or other cancers, the drugs don't just kill cancer cells. They suppress the entire bone marrow. For weeks after each chemotherapy cycle, the child's body cannot produce adequate red cells, white cells, or platelets.

During this window, the child depends completely on transfusion. A child with acute lymphoblastic leukaemia may need platelet transfusions two to three times a week, and red cell transfusions every few days. This continues for months.

Without a steady, reliable supply of blood products, chemotherapy cannot continue. The treatment that saves the child's life requires a parallel pipeline of donated blood sustaining them through the process.

This is not emergency transfusion. This is scheduled, predictable, and ongoing. It requires a stable voluntary donor base, not a one-time response.

Thalassemia: transfusion as a way of life

Children born with thalassemia major cannot produce functional haemoglobin. Without regular transfusion, they develop severe anaemia, organ damage, and growth failure. With regular transfusion, they live.

The frequency is relentless. Every 2 to 4 weeks, from infancy through adulthood. A single patient may receive over a thousand units of red cells in their lifetime. And the requirements are strict. These patients need extended phenotype-matched blood to prevent alloimmunisation, the development of antibodies against donor red cells that makes future transfusions increasingly difficult.

Thalassemia is most prevalent in the Mediterranean, the Middle East, and South and Southeast Asia. In India alone, an estimated 10,000 children are born with thalassemia major every year. Each one will need a dedicated, long-term supply of compatible blood.

For these families, blood donors are not occasional helpers. They are permanent, invisible partners in survival.

Sickle cell disease: a regional burden

Sickle cell disease dominates blood use in Sub-Saharan Africa, the Caribbean, and parts of India. During painful vaso-occlusive crises, patients may need red cell transfusions to dilute the proportion of abnormal sickle-shaped cells. Before major surgeries, exchange transfusion (removing sickle cells and replacing with normal donor cells) is often required.

Some patients are on chronic transfusion programmes, receiving blood every 3 to 4 weeks to prevent strokes and organ damage. Like thalassemia, sickle cell disease requires extended matching to avoid alloimmunisation.

The demand is geographically concentrated. A hospital in Lagos, Accra, or Raipur faces a fundamentally different transfusion demand profile than a hospital in Delhi, London, or Tokyo. Blood banking is not one-size-fits-all. Regional disease burden shapes everything.

Dengue: the seasonal spike

Every monsoon season across South and Southeast Asia, dengue outbreaks drive a sudden surge in platelet demand. Panic spreads. Families scramble. Social media fills with urgent requests.

Here's what most people don't know: not every dengue patient needs a platelet transfusion. The decision depends on the platelet count, the presence of active bleeding, and clinical judgment. Blanket platelet transfusion for every dengue patient with a low count is not recommended by current guidelines.

But those who do need platelets, particularly those with dengue haemorrhagic fever, need them urgently. A single patient may require multiple units of random donor platelets or one apheresis platelet unit.

The challenge for blood banks during dengue season is not just volume. Platelets have a shelf life of only 5 to 7 days. They cannot be stockpiled. They must be collected, tested, and used within a week. This means the donor supply during outbreaks must be continuous, not reactive.

NGOs that wait for dengue season to start recruiting donors are already too late. The base should be built months before the monsoon arrives.

Surgical patients: the invisible demand

Major surgeries that most people consider routine, cardiac bypass, valve replacement, liver resection, joint replacement, all require blood availability as a precondition. Surgeons will not operate unless crossmatched blood is reserved for the patient.

A single liver transplant can require 10 to 20 units of red cells, 15 to 30 units of plasma, and multiple platelet transfusions. Even planned orthopaedic procedures may need 2 to 4 units on standby.

This means hospitals need blood not just for emergencies but to keep their surgical programme running. Without regular voluntary donation, surgeries get delayed. Transplants get postponed. Patients wait on lists that grow longer.

Burns: the plasma crisis

Severe burn injuries cause massive plasma loss through damaged skin. The body loses its ability to maintain fluid balance. Without plasma replacement, the patient goes into shock.

A badly burned patient may need large volumes of fresh frozen plasma over days or weeks. Burns are among the most painful injuries a human being can experience, and plasma transfusion is central to survival and recovery.

Snakebite: the forgotten demand

In rural India, Sub-Saharan Africa, and Southeast Asia, snakebite kills more people than most tropical diseases. Certain venoms cause severe clotting disorders, disseminated intravascular coagulation, and internal bleeding. Patients need antivenom, but they also often need red cells and plasma to replace what the venom destroys.

This demand is predictable and seasonal. It peaks during farming seasons and monsoons. Rural blood banks, often the most understocked, bear the heaviest load.

Why it's never one-size-fits-all

A blood bank in Kozhikode faces different demand than one in Kampala, Bogota, or Birmingham.

In the malaria belt, every donated unit must be tested for malaria on top of the standard panel. Anaemia rates are high, reducing the eligible donor pool.

In dengue-endemic regions, platelet demand spikes seasonally but unpredictably. Planning is difficult.

In the thalassemia belt (Mediterranean, Middle East, South and Southeast Asia), a disproportionate share of red cell inventory goes to chronic transfusion patients.

In areas with high road traffic accidents, trauma drives red cell demand. In regions with advanced surgical programmes, elective surgery consumes a significant share.

The point is that blood banking is local. A good blood bank understands the disease profile of its region and plans accordingly. A good NGO understands this too.

The scale most people don't grasp

A single mid-sized hospital uses 50 to 200 units of blood per day. Not during a disaster. On a regular working day.

Multiply that across every hospital in a district. Then a state. Then the country.

Every unit begins in a donor's arm. There is no factory. There is no synthetic substitute. There is no workaround.

The only source is people.

And whether those people show up depends entirely on whether someone explained to them why it matters, addressed their fears, and made the process easy.

That's what blood donation advocacy is. Not charity. Infrastructure. The quiet system that holds modern medicine together.

This post is adapted from Chapter 2 of The Blood Book (Click here for Indian paperback. Kindle & international Paperback), a field guide to voluntary blood donation for NGOs, volunteers, and communities. Available on Amazon.