
The phases of a study
What phase 1, 2, 3 and 4 mean, and what each asks of the people who take part.
Read the guideVideo visits, home nurses and kits in the mail: what a study without many trips looks like.

Not every study means a long drive every few weeks. A growing number do some or most of their work wherever you happen to be.
Video visits. Check-ins with the study doctor or nurse on a phone or laptop.
Home nurses. A visiting nurse takes blood, checks blood pressure or gives an injection.
Kits in the mail. Swabs, stool or finger-prick kits with prepaid return packaging.
Apps and devices. Symptom diaries, step counters or blood pressure cuffs that send readings to the team.
Medicine delivered. Study treatment sent to your door, with instructions for storing it.
Most studies still need you in person now and then, often for screening, scans or a final visit. Listings described as hybrid mix the two. Ask for the full schedule so you know how many trips there are before you agree.
Home studies rely on technology working. Ask who provides the device or the data plan, what happens if a kit is lost in the mail, and how quickly someone answers if a reading looks wrong. Find out who to call about a side effect, since there is no front desk to walk up to.
Devices and apps collect information continuously. The consent form should explain what they record, where it goes and who can see it. If a device records more than the study needs, such as your location, ask whether that can be switched off.

What phase 1, 2, 3 and 4 mean, and what each asks of the people who take part.
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The sections every consent form has, and the lines worth reading twice.
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Who pays for what, how much of your time a study takes, and help with getting there.
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How a partner, friend or grown child can help, from the first call to the last visit.
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