You see a close-up of a lab worker preparing blood, isolating platelets.
Most people who donate blood do not know that platelets are a completely separate crisis.
Whole blood donations are vital. But platelets are in a different category of urgency — not because fewer people give them, but because they expire in just 5–7 days. There is no building up a stockpile. No strategic reserve. A blood bank that has plenty of platelets on Monday can be completely out by Sunday.
And every week, across India, thousands of cancer patients undergoing chemotherapy, dengue patients with dangerously suppressed platelet counts, and surgical patients with bleeding disorders need platelets to survive.
This is what platelet donation — or apheresis — is about.
Platelets are tiny cell fragments in your blood whose job is to form clots. When you get a cut, your platelets rush to the site, bind together, and plug the wound. Without enough platelets, even a minor injury can cause uncontrolled bleeding. Internal bleeding becomes life-threatening.
A normal platelet count is 150,000 to 450,000 platelets per microlitre of blood. Patients with dengue haemorrhagic fever, cancer undergoing chemotherapy, bone marrow failure, or severe infections can see their counts drop to 10,000 or even lower — dangerously close to levels where spontaneous internal haemorrhage can occur.
The only treatment is a platelet transfusion — and the only source of platelets is a donor.
Platelets have a shelf life of just 5–7 days at 20–24°C, under constant gentle agitation to prevent clumping. This is why blood banks face platelet shortages constantly — even when whole blood stocks are adequate.
Dengue is a particular driver. India experiences major dengue outbreaks every monsoon season. A 2025 study from a tertiary cancer centre in South India analysed 670 plateletpheresis procedures in the first half of the year alone, reflecting the enormous and growing demand. During peak dengue season in cities like Delhi, Mumbai, Chennai, and Bengaluru, platelet requests can outstrip supply by several multiples.
For cancer patients on chemotherapy, the need is year-round. Chemotherapy kills platelets along with cancer cells. A patient on an aggressive treatment cycle may need platelet transfusions repeatedly — every few weeks — throughout their course of treatment.
Standard blood donation collects all components together (whole blood). Platelet donation works differently.
Apheresis (pronounced ay-fer-EE-sis) is a technology-assisted process. Here is what happens:
You give platelets. Everything else comes back.
This is why platelet donors do not experience the same recovery as whole blood donors. Your red blood cells are never removed. Your body replenishes the donated platelets within 48 hours.
This is where the numbers are striking.
When whole blood is separated in a lab, the platelet portion extracted is called a Random Donor Platelet (RDP) unit. It takes the platelets from approximately 5–6 whole blood donations to yield one usable RDP transfusion dose.
A single apheresis platelet donation — called a Single Donor Platelet (SDP) — yields the equivalent of 5–6 RDP units from one donor in one session.
Research comparing outcomes in dengue patients found that patients who received SDP (apheresis platelets) had faster recovery times and shorter hospital stays than those who received pooled RDP. The concentrated, single-source nature of SDP also reduces the patient's exposure to multiple donors, which lowers the risk of transfusion reactions and alloimmunisation over time.
For cancer patients who need multiple transfusions over months of treatment, SDP is the gold standard.
A young cancer patient gets IV therapy, showing how platelet transfusions help prevent bleeding during tough treatments.
This is the main difference from whole blood donation: it takes longer.
A platelet apheresis session typically takes 1.5 to 2.5 hours, depending on the machine, the donor's platelet count, and the target yield. You sit in a reclining chair connected to the machine. Your blood cycles through, platelets are extracted, and the rest is returned to you — continuously, over the course of the session.
This sounds intimidating. In practice, most donors read, watch something on their phone, or chat with staff during the process. The physical experience is unremarkable — a needle in the arm and two hours of sitting still.
Platelet donation has slightly different requirements from whole blood:
Most of the other standard eligibility criteria apply: no HIV, hepatitis B or C, recent major illness, tattoo within 12 months, etc.
Frequency: You can donate platelets up to every 7 days, and up to 24 times per year — far more frequently than whole blood (which is every 90 days). However, most donors and doctors recommend every 2 weeks as a sustainable rhythm.
Not every blood bank has apheresis equipment. Platelet donation requires specialised machines, trained staff, and proper infrastructure. In India, apheresis is available at:
In Delhi, Deen Dayal Upadhyay Hospital Blood Bank, AIIMS New Delhi, and the Indian Red Cross Society (National Headquarters) all conduct apheresis. Platforms like TheBloodApp can direct you to the nearest facility with active apheresis capability.
Every year, between July and November, India's monsoon season triggers a spike in dengue cases. Platelet counts plummet in dengue patients. Blood banks in every major city — Delhi, Mumbai, Chennai, Bengaluru, Kolkata — are overwhelmed with platelet requests.
This is the most acute and predictable platelet crisis in India, and it happens on schedule, every year.
Registering as a platelet donor before dengue season means you are already in the system when the calls start coming. You do not need to wait for a hospital to find you — through TheBloodApp, urgent platelet requests can reach registered apheresis donors directly.
Your body is remarkably quick at recovering from platelet donation. Within 48 hours, your platelet count is fully restored. You can resume normal activities almost immediately. Heavy exercise is best avoided for the rest of the day, but most donors feel fine within a few hours.
The platelets you donate are tested, processed, and typically transfused within 5 days of collection — because that is all the time they have before they expire.
Somewhere in India, a child finishing a chemotherapy cycle or a dengue patient struggling to stop bleeding will receive them. In many cases, that transfusion is what keeps them alive until their bone marrow can recover enough to produce platelets on its own again.
Register on TheBloodApp today. Indicate your interest in platelet donation — our platform can connect you with the nearest apheresis facility and send you alerts when platelet donors are urgently needed in your area. To find a platelet donation centre near you in Delhi, Mumbai, Bengaluru, Chennai, Hyderabad, Kolkata, or Pune, call the number listed in the app.
Sources: Sankalp India Foundation — Platelet Apheresis Guide | PMC — Hematological Changes in Apheresis Donors (2024) | PMC — Plateletpheresis at Tertiary Cancer Centre South India (2026) | PMC — SDAP in Dengue Management | Rehras Sewa Society — Platelet Donation | eRaktKosh — Blood Component Guide | IRCS New Delhi Blood Centre Data
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