Blueprint microplastics test — 2/5 from a real user.

What the Blueprint microplastics test is.

The Blueprint Protocol is Bryan Johnson's longevity project, best known for its public dietary stack and its eyebrow-raising self-experimentation. Among the products the team has commercialised is a home blood-spot test that quantifies serum microplastics — a class of small polymer particles increasingly detected in human blood, organs, and arterial plaques.

The pitch is straightforward: microplastics are a plausibly important under-tested exposure marker, no clinical lab will run this assay for a regular patient, so a DTC home kit is the only practical way to get a number. That premise is reasonable. The execution does not match.

The collection experience.

This is where the product loses most of its score. The kit is a finger-prick blood collection — you puncture your fingertip with a metal lancet and squeeze blood onto a collection card or into a small tube. Three things make this worse than the kit's marketing suggests:

1. The lancet is metal, not the spring-loaded plastic single-use device most home glucose monitors use. Manual depth control. Painful. Bleeding rate is unpredictable.
2. The volume requirement is higher than a finger comfortably yields. A typical finger-prick gives ~50 µL with effort. The Blueprint kit needs more, which means re-pricking. I ended up making multiple punctures across several fingers to fill the card.
3. The instructions don't acknowledge how hard this is. Most home-collection kits warn you that a single prick may not be enough; Blueprint's onboarding is overly optimistic about the procedure.

For comparison: a venous draw at a clinical lab is ~5 minutes of mild discomfort and produces 10 mL of blood, plenty for any assay. The Blueprint kit asks the user to do clinical-volume work with consumer-grade tools.

What the result tells you.

Even if you successfully complete the collection and the lab returns a clean number, you arrive at the bigger problem: what do you do with it?

As of 2026, no validated clinical intervention reduces serum microplastics. The intuitive moves — drink filtered water, avoid plastic food contact, reduce processed food, ventilate indoor spaces — are exposure-reduction strategies you should already be doing whether or not you have a number. There is no equivalent of "your ApoB is high → take Ezetimib" for microplastics. There is no titration, no dose-response intervention, no re-test-in-12-weeks plan that makes the number actionable.

Which means the test serves a single purpose at most: confirming that you, like everyone else who's ever been measured, have measurable serum microplastics. That's not a finding worth multiple finger pricks. The early adopter hope is that quantifying exposure now creates a baseline for future interventions, but until those interventions exist, the test is a curiosity, not a tool.

"You arrive at a number with no clinical lever to pull on it."

A note on reference ranges.

Microplastics quantification in serum is a young field. Reference ranges vary by methodology (pyrolysis-GC/MS vs other approaches), by which polymers are quantified, and by extraction method. A "high" or "low" result on the Blueprint test isn't directly comparable to academic studies using different methods. Until the field standardises around one assay family — and Blueprint's particular method gets validated in published research — interpreting a single number is ambiguous even before the actionability problem.

Who it's for.

The Blueprint microplastics test is right for one specific user: someone deeply invested in exposure-tracking who wants a baseline to compare against future interventions, and is comfortable doing clinical-volume blood work with a consumer kit.

For everyone else, the playbook is: do the exposure-reduction moves now (filtered water, glass food containers, fewer plastic-wrapped foods, less processed food), revisit testing in two or three years when the field has standardised methods and the first interventions enter clinical trials. Until then, the test produces curiosity, not action.

Related reviews.

Reviewed by Niko Hems · Last updated May 7, 2026