Twice Precise
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About

I'm not a doctor. I read the studies and share my own numbers.

Twice Precise is one person with a microphone. I test on a fixed schedule, and I read studies all the way to the end. No face, no made-up credentials, no persona.

Not medical advice. I'm not a doctor.

Why I test twice

A blood test result is one reading. Take the same test twice, two weeks apart, and change nothing on purpose: same arm, same time of day, nothing to eat beforehand. The numbers still won't match exactly. That gap is the normal bounce: how much results move on their own.

Most health content skips this step. A headline says something “raised” or “lowered” a number. Nobody asks how much that number moves on its own between two ordinary tests. Until you know that, one before-and-after comparison can't tell you much.

So the first thing I measure is how much my own results bounce. I share that before I share anything else.

Same test, nothing changed, two different numbers.
Example bounce figure Test 1 and test 2, two weeks later, sit at slightly different heights. The gap between them is the normal bounce. A later result that lands inside that band is not counted as a change. No values on the axis. Example only, not my results. normal bounce test 1 test 2, two weeks later a later result Example only, not my results

What I do

  • Test the same way every time. Same arm, same time of day, nothing to eat beforehand, two weeks apart. If anything changes between tests, I say so, and I don't count the difference as a result.
  • Share every number. That includes the ones that didn't move. They're the most honest results I have, and the hardest to fake.
  • Work out PhenoAge myself. PhenoAge is a published formula (Levine et al., 2018). It combines standard blood test results into one research estimate. I work it out again after every blood test and show the numbers that go into it. It's a research measure, not a diagnosis.
  • Read the study, not the press release. When a video talks about a study, I've read the study. The citation is in the video description.

What I don't do

  • Give medical advice. Nothing here is advice about your health, and I'm not a healthcare professional.
  • Say what a test “caught.” I'll tell you what I measured and how much it moved.
  • Repeat a company's marketing claims. If a company says its test “finds” something, that's their claim, not mine.
  • Recommend a dose, a supplement or a treatment for you.

Why there's no face or name

Sharing your own lab results is a privacy risk. Lab reports carry your legal name, date of birth and home address. So I re-type every number into my own charts. I never post a screenshot of a lab report or dashboard. I also don't say where or when I get tested, beyond the steps listed above.

Trust here comes from sharing every number and showing how I test, not from a face on a thumbnail.

How this is paid for

I pay for my own tests. Some companies whose tests and products I cover run affiliate programs, which pay a commission when someone buys through a link. I may join some of them.

When I do, the link says wherever it appears. The program is listed with its start date on the disclosure page. A company paying me doesn't change what I report about its product, or where it ranks on the price tracker.

Corrections

If I get something wrong, email hello@twiceprecise.com. I publish corrections with the date and what changed. I don't bury them. That goes for brands too, whether or not they pay me.

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