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Arun V J: Do You Know What SDP or Apheresis Platelet Is?

Arun V J/LinkedIn

Nov 12, 2025, 05:10

Arun V J: Do You Know What SDP or Apheresis Platelet Is?

Arun V J, The Leader of Transfusion Medicine at Malabar Medical College, shared on LinkedIn:

”Do You Know What SDP or Apheresis Platelet Is?

Most doctors, donors, and even healthcare workers don’t truly understand what an SDP is — or how it’s different from an RDP.

Because when we misunderstand science, patients pay the price.

First, what are we talking about?

RDP (Random Donor Platelet):
Platelets separated from whole blood donations.
A single unit gives a small platelet yield.
So, for one patient, you usually pool platelets from 4–6 different donors to reach the required dose.

SDP (Single Donor Platelet):
Collected through apheresis, where a machine selectively removes platelets and returns the rest of your blood.
One SDP = 4–6 RDPs in platelet count — but from one donor only.

Why this matters

When a patient receives RDPs, they’re exposed to multiple immune systems.
Each donor’s platelets have different antigens.
This increases risks like immune reactions and platelet refractoriness (when the patient stops responding to transfusions).
SDP minimizes this risk.

That’s why it’s preferred for cancer patients, bone marrow transplants, and those needing repeated transfusions — not for “faster rise.”

Why SDP Costs More

It’s not “premium blood.”
The cost includes sterile single-use kits, apheresis machine use, longer donation time, and trained personnel.
But it gives safer platelets, traceable donors, and fewer complications.

Common Myths (Let’s Bust Them)

Myth 1: “SDP gives faster platelet count rise.”
False. Rise depends on the patient’s body, not platelet type.

Myth 2: “SDP is only for rich people.”
False. Many hospitals subsidize or cover it under insurance.

Myth 3: “SDP donation is painful.”
False. It’s smooth, safe, and you get your red cells back.

The Bigger Picture

In developed countries, apheresis platelets are the standard.
In India and similar regions, we’re still transitioning — mainly because of awareness gaps & cost of technology.
If every doctor and donor understood the difference, we’d save time, cost, and lives.

The Third Thinker Takeaway