How Long Should You Keep Blood Test Results?

How long should you keep blood test results? The honest answer is simpler than the question: keep all of them, indefinitely.

That sounds like advice from someone who has never seen a full drawer. So here’s the case — because “how long do I keep this” is really a paper question, and the moment a result is scanned, the question changes shape entirely.

The short answer: keep them all

Retention limits exist because storage used to cost something. An archive room, a folder that thickens every year, a drawer that eventually stops closing — when keeping a document takes up space, “how long” is a fair question.

A scanned blood test is a small PDF. Every result you will produce in your lifetime takes less space on your phone than a dozen photos. There is no storage cost and no clutter to manage — which means the real question isn’t when you’re allowed to let go of your results. It’s how to make sure you never lose them.

Why your oldest results also count

A single blood test is a snapshot: numbers on a page, each with a reference range beside it. Its real value only appears next to the ones that came before.

The question your doctor cares about is rarely “what is this value today?” It’s “what has this value been doing?” A number can sit inside its range on every single report and still be moving, slowly, year after year — and that is simply invisible on one page. It only becomes visible next to results that are three, five, ten years old. Whether a drift matters is a conversation for your doctor; but neither of you can have that conversation if the earlier results are gone.

That’s also the quiet argument for starting as early as possible. The results from your twenties and thirties are the only record that will ever exist of what your “normal” looked like — your baseline, measured while nothing was wrong. You can’t order that measurement retroactively. Every result you keep today is one more point on a line your future self may badly want to see.

Doesn’t the lab keep them for me?

For a while — and for its own reasons, not yours.

Labs and clinics keep records to satisfy regulations, and those retention rules are written around their obligations: typically years, not decades, and different in every country. Beyond that, nothing in the system is designed to give you one continuous history. Results live in whichever portal the lab happens to run — the one that logs you out every time. Switch labs, switch doctors, move cities, and your history splits across systems that don’t talk to each other, in report formats that don’t even look alike.

None of this is anyone’s failure; it’s what happens when every institution keeps its own slice. The only copy of your history that is reliably complete, reliably yours, and still findable in ten years is the one you keep yourself.

What to do with the paper (and the PDFs)

Keeping everything doesn’t mean keeping piles. It means giving results one home.

Scan the paper ones — the printed report, the page that’s been folded in a coat pocket since the appointment. Save the digital ones — the portal download, the emailed attachment — into the same place, so “where is it” has exactly one answer per person: your results in your folder, your kid’s in theirs, a parent’s in their own. We’ve written a full guide to that setup — one folder per person, records that name themselves, search that finds a result by the words inside it: the best way to organize medical records on iPhone.

Once a result is scanned and filed, the paper itself is free to go wherever paper goes. You’re not keeping paper. You’re keeping the record.

Where this is going

Keeping every result is the foundation. The next step is what a complete history makes possible: every blood test you’ve ever taken, one trend per value, with the original report behind every point.

That’s Pockli Health — the trusted home for your health records, a sibling to Pockli Scan, in development now. The waitlist is open, and the story behind it is on the blog.

Until then, Pockli Scan already keeps blood test results — and every other health record — organized, private, and findable. Download Pockli Scan and start with the report nearest to you right now.

Scan it. Find it. Forever.