LetterAgent
Mail physical letters by just asking your AI assistant.
Home > Guides > Lab result fax
Yes, a lab result can be faxed to a doctor's office, and many clinics still prefer fax for results because it lands directly in their chart system. Send the complete report with patient identifiers and reference ranges intact, confirm the fax number with the clinic first, and keep the confirmation page as your proof of sending.
It looks old-fashioned, but fax fits how clinics file paper. A faxed result arrives as pages that staff can attach to a chart without logging into a separate portal or chasing a download link. For urgent results, that direct landing matters: the fax machine sits in the office, staff see it, and abnormal values get flagged by a human the same day. Email, by contrast, can sit in a general inbox or get filtered as spam, and a patient portal message can go unread until the next login.
There is also a privacy angle. Fax travels over phone lines to a single machine rather than sitting in an email account that might be shared or forwarded. That is not a guarantee of secrecy, since anyone near the receiving machine can pick up the pages, but clinics treat fax as a closed loop between two known numbers. That is why many labs still list a fax number as the default delivery route for doctors.
| What to send | What to leave out |
|---|---|
| Full report with patient name, date of birth, and collection date | Other patients' results printed on the same run, if the lab bundled pages together |
| Reference ranges and flagged values | Handwritten notes that could be misread as part of the result |
| Ordering doctor and lab name | Your insurance card, which the clinic does not need for a result |
Do not rely on fax alone for a critical result. Fax the report, then call the clinic and say the result is on its way and why it matters. A fax confirmation page proves the pages left your machine, not that a doctor read them. For results marked critical by the lab, the lab itself usually phones the ordering doctor directly, which is a separate safety net. If you are forwarding a result yourself because the lab gave it to you first, the phone call after the fax is what turns a sent document into an acted-on one.
Double-check the number digit by digit before sending, and confirm it with the clinic rather than trusting a number printed on an old form. A single wrong digit can send health details to a stranger's machine. Put the patient's name and date of birth on each page, not just the first, so pages that separate in the receiving tray can be matched back to the right chart. If the result covers a sensitive test, ask the clinic whether it prefers a direct line or a specific fax number for confidential material, since some offices route those to a machine in a back room.
Legibility is the main risk. Lab reports are dense, with small type and shaded flag columns, and a poor fax can blur a decimal point or a flagged value. Check your confirmation copy at full size before you call the job done. If numbers look soft or a column edge is cut off, resend from the original rather than from a copy. Also watch for missing pages: multi-page reports sometimes drop the last page, which is often the page with the interpretive comment. Count the pages on the confirmation against the pages in the report.
With LetterAgent, you send a fax by asking your AI assistant. You get a per-fax quote with the page count verified, approve the exact total, and pay once through Stripe. Faxing is available in testing, and only US and Canadian fax numbers are supported. There are no inbound faxes. Confirm the recipient accepts faxed documents before you send, since a fax that arrives is not the same as a fax the office will act on.
Ready to fax it? Fax with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is sent.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
Need help? Ask your assistant: it can check a job's status any time. If it ever can't handle something: hello@getletteragent.com