About these estimates

What it shows

The level line on the shot timeline and the Today week card is an estimate of how much of your recent doses is still active. It's worked out from the doses you log. It isn't a measurement: the app can't know your actual level, and only a lab test can measure it.

How it's worked out

1. Each dose you log is taken in over the first hours or days, reaches its highest point around a typical time, then fades.
2. It fades by half every half-life: the time the body typically takes to clear half of it.
3. Doses add together, so after several regular doses the line settles into a repeating pattern.

This is a standard one-compartment model from pharmacology, using typical values from published studies of each medication.

The numbers it uses

Typical values. Real ones vary from person to person. Some other injectables also have an estimate in the app; the app shows the values it uses for each of your medications. Medications without published values get no estimate.

The phases

• Rising: from the dose until most of the way to its usual highest point.
• Peak: within about 12% of this cycle's highest estimated level.
• Steady: between about 72% and 88% of it.
• Fading: below about 72%, as the next dose comes up.

Appetite notes next to a phase describe what people commonly notice. They aren't a prediction of how you'll feel.

What it can't account for

Your body, weight, health, the injection site, timing, and anything you didn't log all change real levels, and none of them are in the estimate. A dose logged late or not at all moves the line too.

Tracking, not advice

The estimate never tells you when or how much to take. Follow your prescription and your healthcare provider.

Suggestions, not medical advice. Check with your healthcare provider if you're unsure.