WhatsApp lab report delivery: consent, templates, PDF letterhead

WhatsApp report delivery means the lab software sends the signed report as a PDF on the lab's letterhead to the patient's WhatsApp number, and optionally to the referring doctor, the moment the pathologist authorises it. It runs on the WhatsApp Business Platform, which has rules on consent, message templates and timing. This article covers those rules and how a lab should set delivery up so that reports arrive and the number does not get blocked.

What consent does the lab need?

Meta's policy is that a business may message only people who have opted in. Its opt-in guidance says the opt-in must make clear that the person is agreeing to receive messages and must name the business they are agreeing to hear from, and that it can be collected on a website, in person or on paper, as long as local law is followed.

For a lab that means one line on the registration form: I agree to receive my reports from this lab on WhatsApp at this number. The software should store the consent with the patient record and show it on the registration screen. Indian law adds its own layer. The Digital Personal Data Protection Act, 2023, on the MeitY site, governs how personal data is processed, and a health report is personal data. Consent recorded at registration, a way to withdraw it, and reports sent only to the number the patient gave are the practical minimum.

What is the 24-hour window and why does it matter for a lab?

When a person messages a business, WhatsApp opens what Meta calls a customer service window of 24 hours. Inside it the business can send free-form messages. Outside it, the business can send only pre-approved template messages. The rule is set out in Meta's send messages guide.

A lab's report almost always goes out more than 24 hours after any message from the patient, and usually with no message from them at all. So report delivery is always a template message. This is not a problem; it simply means the lab needs an approved template before the first report goes out, and the software must use it. Software that tries to send a free-form message with a PDF outside the window will fail silently, and the front desk will hear about it from the patient.

How do message templates work?

A template is a fixed message with numbered variables, such as {{1}} for the patient name. Meta reviews every template automatically when it is created, and its template documentation notes that review can take up to 24 hours. Templates belong to one of three categories: marketing, utility or authentication. A report notification is a utility message, because it is about a transaction the patient already has with the lab.

Meta's pricing page explains that templates are charged per message delivered, that utility templates sent inside an open service window are free, and that replies to a customer inside the window are free. Rates vary by country and change over time, so read the current page rather than a vendor's brochure.

Keep the report template short and plain. Templates that read like advertisements get rejected, and templates that patients block get downgraded by Meta's quality rating until they are paused. Pathixio ships with report, receipt and dues templates already approved on its number, and the lab can add its own.

How should the PDF look?

The PDF that reaches the patient is the lab's letterhead, the same one that prints at the counter. It should carry the lab name and registration details, the patient details, the results with ranges and flags, the pathologist's name and digital signature, and the date and time of authorisation. Meta's media reference allows PDF documents up to 100 MB, so size is not a constraint; a typical report is a few hundred kilobytes.

• Send the PDF only after authorisation. A draft report on WhatsApp cannot be recalled.
• Use the report designer to match the printed letterhead exactly, so the patient sees one format everywhere.
• Name the file with the patient name and date, so it can be found later in the chat.
• Keep the caption to one line. The report is in the document, not in the message text.

We wrote more broadly about designing for this channel in WhatsApp is the interface.

Should the referring doctor get a copy?

Often yes, and it is one of the most appreciated features in a lab. The steps are simple.

1. Record the doctor's WhatsApp number once in the referring-doctor master.
2. Let the doctor opt in, the same way a patient does. A doctor who did not ask for reports on WhatsApp will block the number.
3. Choose per doctor whether they get every report, only abnormal reports, or a daily summary.
4. Send the same authorised PDF, not a different version.
5. Log every send with the time and delivery status, so a query about whether a report went out has an answer.

Where a result needs explanation, a phone call is still better than a message. The software should make the number one tap away, not push the message out regardless.

Frequently asked questions

Can I send reports from my personal WhatsApp number?

You can, by hand, one at a time, and many small labs do. It does not scale and leaves no record in the lab system. Automated delivery uses the WhatsApp Business Platform through a provider, with a verified business number, approved templates and per-message charges. The lab's software handles the sending and logs each delivery against the patient.

What if the patient does not have WhatsApp?

Delivery should fall back gracefully. The software should try WhatsApp, and if the number is not on WhatsApp or the message is not delivered, show that status at the front desk so the report can be printed or emailed instead. Keep the printed copy as an option for every patient who asks for one.

Is a WhatsApp report legally the same as a printed one?

The PDF is the same document, produced by the same system after the same authorisation, and carries the same signature. Whether an electronic copy is sufficient for a particular purpose, such as a medico-legal case or an insurance claim, depends on the receiving party. Keep the original in the system and print on request.