Accessibility

We aim to meet WCAG 2.2 AA. The checking step is the part that matters most, so it is built to work with a keyboard alone, every field is labelled, and the session countdown is announced to screen readers when it becomes urgent.

Time limits

Sessions expire after an hour because results are not stored. You can extend a session once from the countdown. If an hour and a half is not enough time to check your values, download them as a spreadsheet and start again — nothing is lost by doing so.

Motion

Animation is reduced automatically if your device asks for reduced motion.

Tell us what does not work

Use the contact form. Please do not include any laboratory values.