Someone’s only match might be you

I give blood. I have for years, and for most of that time nothing came of it beyond a biscuit and a sticker.

Then I got a call. My tissue type matched a woman in America with leukaemia.

I had registered with Strength to Give — now Stem Cell Donors Australia — while I was living in Perth. All I did after that was keep my contact details current. Then nothing happened for five years.

The call, when it came, was a complete surprise. I had forgotten I was on a registry at all. By then I was in Melbourne, so that is where I donated. Perth to Melbourne to America, on the strength of a form I filled in five years earlier and never thought about again.

Your match is not local

That is worth sitting with, because most people assume donation is a local thing — that you would be helping someone in your city, or at least your country. Registries are linked internationally. The person who needs what you have could be anywhere.

I know she is a woman in America. That is genuinely everything I know.

What it actually involved

Less than people assume. Daily injections of G-CSF — a synthetic protein that mirrors a hormone your body already makes — given just under the skin, into the belly or thigh, like insulin. Four or five days is typical; mine ran about a week. It tells your bone marrow to overproduce blood stem cells and push them out into your bloodstream where they can be collected.

Your marrow working overtime feels like it sounds: aching bones, sore muscles, tired, a headache. Paracetamol handles it. It stops when the injections stop.

Then the collection, which is closer to giving plasma than to surgery. Blood out of one arm, through a machine that keeps the stem cells, back in the other. No operation, no general anaesthetic, nothing lasting.

The part almost nobody knows

Matching is not blood type. It is tissue type, and tissue type tracks ancestry. A patient’s best chance sits with donors who share their genetic background.

Which has a consequence people rarely think through: if you are of mixed heritage, your match has to be too. You cannot be served by two donors who each match half of you. Your own family may not match you. The registry has plenty of people on it — it does not have enough people from every background, and for mixed-heritage patients that gap is the difference between a transplant and no transplant.

The donors the registry needs most are the ones least likely to have ever been asked.

One correction worth making

You can register between 17 and 35, and I have heard that repeated as "after 35 it is dangerous". It is not. The window is about outcomes — patients do measurably better with younger donors — and once you are on the registry you stay on it until 60.

So if you are registered and over 35: you are still somebody’s possible match. Do not count yourself out.

It costs you nothing

Register next time you give blood. It is a swab or one extra tube on top of what you were doing anyway. Most people who join are never called. Some of us are, once — mine came five years later, out of nowhere — and it costs about a week of mild inconvenience.

Stem Cell Donors Australia is where to start.