What Is a Doctor’s Referral Letter in Hong Kong’s Healthcare System?
Many patients from mainland China who plan to travel to Hong Kong for Western medical examinations or treatment are often asked—when booking appointments at imaging centres, laboratories, or specialist clinics—whether they have a doctor’s referral letter.
For patients who are used to registering directly and freely choosing medical tests in mainland China, such a requirement may feel unfamiliar. Some may even misunderstand it as an artificial barrier to accessing healthcare.
In reality, within Hong Kong’s healthcare system, a doctor’s referral letter is not an additional requirement, but rather a medical document governed by clear legal and professional regulations. Its existence is closely linked to medical safety, professional accountability, and the protection of patient rights. Understanding this can help reduce confusion and unnecessary delays when seeking medical care across borders.
Why Are Doctor’s Referral Letters Usually Required for Imaging Tests or Blood Tests in Hong Kong?
In Hong Kong, imaging tests and blood tests are considered regulated medical procedures.
Imaging examinations such as X-rays, CT scans, and PET-CT scans often involve ionising radiation, while MRI scans also require a doctor’s referral to determine the specific area to be examined. Blood tests, on the other hand, are considered invasive medical procedures.
For these reasons, both types of examinations are regulated under the Medical Registration Ordinance and related professional guidelines in Hong Kong. These regulations are intended to prevent patients from being exposed to unnecessary, excessive, or inappropriate medical risks.
In this process, a doctor’s referral letter does not function as an administrative approval or rejection. Instead, it serves to clearly define the medical instructions and the professional responsibility involved.
A compliant referral letter typically specifies:
• The exact examination required and the body part to be examined
• The medical reason or clinical background for recommending the test
• The specific indicators or panels required for blood testing
Without this key information, staff at imaging centres or laboratories do not have the legal authority to determine which tests a patient should undergo, nor can they make medical decisions on behalf of a physician. Therefore, in Hong Kong, many tests cannot be arranged without a doctor’s referral letter.
If I Do Not Need Insurance Claims, Can I Book a Specialist Directly?
From a regulatory standpoint, yes.
Hong Kong law does not require patients to obtain a referral from a general practitioner before seeing a specialist. However, in practice, many patients still choose to consult a general practitioner (GP) first before being referred to a specialist.
There are several practical reasons for this.
One reason relates to insurance claims. Many medical insurance policies specify that specialist consultation fees will only be reimbursed if the patient has first been evaluated by a general practitioner who issues a referral letter.
Another reason is that this approach makes the medical process more efficient. A GP can help review the patient’s medical history and perform an initial assessment, allowing the specialist to focus directly on the core medical issue rather than repeating basic evaluations.
This GP-first healthcare model differs significantly from the mainland system, where patients often select specialties and register directly. The difference reflects Hong Kong’s emphasis on clear allocation of professional responsibility and risk management within its healthcare system.
Do Patients Coming to Hong Kong for Treatment – Especially Cancer Patients – Need a Referral Letter?
The “referral letter” mentioned here is not exactly the same as the legally required referral for imaging or blood tests.
For patients planning to come to Hong Kong for further examinations or treatment—especially cancer patients—it is strongly recommended that their attending physician in mainland China provide a medical summary or referral letter outlining their condition.
Such documents typically include:
• The confirmed tumour type and staging
• Previous and recent treatment plans
• Results of major diagnostic tests already completed
• Hospitalisation records and treatments received during admission
Although this type of referral letter is not legally mandatory, it has significant clinical value in practice. It helps doctors in Hong Kong quickly understand the patient’s medical condition during remote consultations or initial appointments, reducing duplicated tests and missing information. As a result, it can significantly improve diagnostic efficiency and save valuable time.
Are Referral Letters for Imaging or Blood Tests Issued by Mainland Doctors Accepted in Hong Kong?
At present, the answer is no — they cannot be directly accepted or used in Hong Kong.
This is because mainland China and Hong Kong belong to different legal jurisdictions, and medical practice in each region is governed by its own legal and professional regulatory systems.
Currently, Hong Kong law does not grant mainland-registered doctors the authority to issue legally valid referral instructions for Hong Kong imaging centres or laboratories.
Therefore, in practice:
Referral letters for imaging or blood tests issued by mainland doctors cannot be used directly for tests in Hong Kong. In most cases, a Hong Kong-registered doctor must reassess the patient and issue a referral letter that complies with local regulations.
However, it is important to emphasise that medical records, diagnostic reports, and treatment history provided by mainland doctors remain valuable medical references for Hong Kong physicians when assessing the patient’s condition.
Summary
In Hong Kong, a doctor’s referral letter is not a barrier that makes medical access more difficult. Rather, it is a medical document grounded in legal requirements, professional accountability, and patient safety.
Its core functions include:
• Protecting patients from unnecessary medical risks
• Clarifying professional responsibility for medical procedures
• Improving the efficiency and accuracy of cross-institution and cross-border medical care
For patients from mainland China who plan to seek medical treatment in Hong Kong, understanding the true role of referral letters within Hong Kong’s healthcare system and preparing accordingly can make the entire healthcare process clearer, smoother, and more effective, while also helping patients obtain medical advice that is better suited to their specific condition.
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