What a good blood test app should do with your lab report: read it accurately, check units, show trends over time, and keep the data private. What to avoid, too.
A lab report is dense. Dozens of values, reference ranges, and units that change from one lab to the next. It is natural to want an app that makes sense of it. Here is what a good one should do, and where many fall short.
Everything depends on getting the numbers in right. A good app lets you import a PDF or a photo, then shows you each value it found so you can confirm it before anything is calculated. If the app silently misreads one line, every result that follows is wrong.
Delta reads your report, then puts every marker on a confirm screen. Nothing is scored until you have looked at it.
This is where many tools go wrong. The same glucose reading is about 18 times larger in mg/dL than in mmol/L. Creatinine differs by a factor of about 88 between mg/dL and µmol/L. Labs in different countries use different conventions.
An app should convert only units it knows, and refuse the rest. Delta checks every unit against an allowlist. An unknown unit is rejected, not guessed.
Single values are hard to act on. A combined measure helps you see the overall picture. Delta computes Adaptive Age, a biological age from nine routine markers using the published PhenoAge formula (Levine 2018). The calculation runs on your phone and gives the same result every time for the same inputs.
The real value comes from repeat tests. One report is a snapshot. Two reports, months apart, show a direction. Delta keeps every panel you add in order, so the trend is easy to see.
A blood test app is not a doctor. It should not tell you that you have a condition, and it should not hand you a supplement plan based on one number. Watch for apps that turn every out-of-range marker into a product recommendation.
Delta is a wellness app. It shows your numbers and how they change. Decisions about treatment belong in a conversation with your clinician.
Blood results are among the most personal data you have. Ask where they are stored and who can read them. Many services keep your full history on their servers, tied to an account.
Delta has no accounts. Your history is stored on your device. When a report is read by our analyzer, it is processed and discarded, not kept. Our privacy policy lists exactly what our servers hold and for how long.
Delta is free on the App Store and Google Play. Get Delta.
