以下是一份英文诊断证明的模板，您可以根据具体情况进行适当修改：

[Your Name]
[Your Title/Position]
[Name of the Medical Institution/ Clinic]
[Address of the Medical Institution/ Clinic]
[City, State, ZIP Code]
[Country]
[Phone Number]
[Email Address]
[Date]

[Patient's Name]
[Patient's Date of Birth]
[Patient's Address]
[City, State, ZIP Code]
[Country]

Dear [Recipient's Name],

RE: DIAGNOSTIC CERTIFICATE

I am writing to provide a diagnostic certificate for my patient, [Patient's Name], as per their request. I have thoroughly examined the patient and reviewed their medical history, test results, and other relevant information. Based on my professional judgment and expertise, I have arrived at the following diagnosis:

1. Medical Condition/Diagnosis: [Provide the specific diagnosis or medical condition]
2. Date of Diagnosis: [Specify the date when the diagnosis was made]
3. Duration of the Condition: [Indicate the duration or whether it is an ongoing condition]
4. Clinical Findings: [Briefly summarize the relevant clinical findings supporting the diagnosis]
5. Treatment/Management Plan: [Describe the recommended treatment plan or management approach, if applicable]
6. Prognosis: [Provide an assessment of the patient's prognosis or expected outcome, if applicable]

Please note that this diagnostic certificate is based on the information available to me at the time of examination. It is important to consider that medical conditions can evolve, and new information may impact the diagnosis or treatment recommendations. Therefore, it is recommended that the patient seeks regular medical check-ups to monitor their condition and receive appropriate care.

Should you require any further information or clarification, please do not hesitate to contact me. I remain available to assist in any way possible.

Thank you for your attention to this matter.

Sincerely,

[Your Name]
[Your Title/Position]
[Medical License Number, if applicable]