Direct mail

Is direct mail to physicians effective for clinical trial recruitment?

By TrialNotice · Updated
Hand pulling a navy envelope from a wooden mail tray in a medical practice back office
Short answerThe best available evidence says mail reaches physicians better than email alone. In a randomized trial of 13,251 oncologists, a mailed invitation drew an 11.8% response versus 4.5% for email, and only a quarter of email recipients even opened the message. Most mail responders replied online through the link in the letter, which is why mail works best paired with a trackable link or QR code and digital follow up.

What does the research show?

Researchers randomly assigned 13,251 medical, surgical, and radiation oncologists to mail based or email based invitations to a study about trial accrual. Response was 11.8% for mail versus 4.5% for email. Only about a quarter of email recipients opened the email, and email recipients did not respond until they received a reminder postcard by mail (BMC Medical Research Methodology).

11.8%
physician response to mailed invitations
4.5%
physician response to email invitations
~25%
of emailed physicians opened the email
This study measured survey response, not patient referrals. It is still the clearest randomized evidence on how physicians respond to mail versus email.

Why does mail work with physicians?

Physician inboxes are crowded and filtered. A letter arrives on the desk, can be passed to staff, and stays in view. In the same study, most mail responders actually completed the survey online through the link printed in the letter (BMC Medical Research Methodology). Mail got attention; the link made acting on it easy.

What makes a physician letter effective?

  • Study specific content, since physicians name missing study information as a key barrier to referral (Tufts CSDD).
  • A trackable response path, such as a unique QR code or short link per physician.
  • A named coordinator contact for physicians who prefer to call.
  • Follow up by email and LinkedIn, prioritizing physicians who scanned or replied.

See what to include in a clinical trial referral letter.

Is direct mail enough on its own?

No. The study showed that the combination of channels mattered: email recipients responded only after a mailed postcard. Use mail to open the door, digital channels to follow up, and consistent reporting back to keep physicians referring (Applied Clinical Trials).

Get your study in front of the right local physicians

TrialNotice builds a physician referral pipeline around one active study. We identify relevant local physicians within driving distance of your site, send study aligned direct mail, follow up by email and LinkedIn, track engagement with recipient level QR codes, and route warm responses into your site team's workflow.

Talk to TrialNotice

Sources

  1. Murphy C.C. et al., "A randomized trial of mail and email recruitment strategies for a physician survey on clinical trial accrual," BMC Medical Research Methodology
  2. Applied Clinical Trials, "Tufts CSDD Study Explores Low Recruitment Rates"
  3. Applied Clinical Trials, "Building a Physician Referral Network: A Case Study"

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