What a Sleep Clinic Referral Letter Should Include

Quick answer: A good sleep clinic referral letter explains why the patient is being referred, what symptoms are present, how long they have lasted, relevant medical history, medicines, prior tests and any safety concerns. It should be specific enough for triage, not a one-line note. Patients can help by preparing a short summary of their symptoms and questions.

The referral letter is the first thing a sleep service sees. It decides whether the appointment is routine, urgent or redirected. A vague letter can delay care even when the patient's symptoms are serious.

This guide explains what a useful letter contains, whether you are writing one as a clinician or preparing for an appointment as a patient.

Why the letter matters

Sleep services receive more referrals than they can see quickly. They use the letter to triage: who needs urgent assessment, who can be managed in primary care, who needs a specific test. A letter that says only "please assess sleep" gives the triage clinician nothing to work with.

A specific letter does not need to be long. It needs to answer the questions the specialist will ask.

What to include

Reason for referral

State the suspected diagnosis or the main problem: suspected obstructive sleep apnea, chronic insomnia, restless legs, narcolepsy, parasomnia, or excessive daytime sleepiness. If the diagnosis is unclear, say what you are trying to rule out.

Symptoms and timeline

Describe the key symptoms and how long they have been present. For apnea, include snoring, witnessed pauses, gasping, choking, morning headaches, unrefreshing sleep and daytime sleepiness. For insomnia, include sleep onset, maintenance, early waking and daytime impact. For restless legs, include timing and relief with movement.

Severity and functional impact

How is the patient affected? Sleepiness while driving, falling asleep at work, poor concentration, mood changes, relationship strain or inability to work are relevant. Use the patient's own words where possible.

Medical history

List conditions that affect sleep or treatment: obesity, hypertension, atrial fibrillation, heart failure, stroke, diabetes, thyroid disease, depression, PTSD, chronic pain, pregnancy, menopause, and prior airway surgery. Mention if the patient uses CPAP or an oral appliance.

Medicines and allergies

Include current medicines, doses and any that affect sleep or breathing. Note allergies and adverse reactions.

Examination findings

If available, include blood pressure, BMI, neck circumference, nasal obstruction, tonsil size, jaw structure and any relevant neurological findings. Not every primary care visit includes a full airway exam, but any findings help.

Prior tests and treatment

Summarize previous sleep studies, oximetry, thyroid tests, iron studies, CBT-I, CPAP trials or surgery. Attach the reports if possible. A previous normal study does not always rule out a current problem.

Safety concerns

Flag severe daytime sleepiness, driving, commercial driving, safety-critical work, pregnancy, heart rhythm problems, uncontrolled hypertension, or a child with breathing pauses. These affect triage and urgency.

Patient goals

What does the patient want from the referral? Diagnosis, treatment, a second opinion, CPAP review, or help returning to work. A clear goal helps the specialist focus the appointment.

A template outline

1. Patient details and date
2. Reason for referral and suspected diagnosis
3. Main symptoms and duration
4. Functional impact and safety concerns
5. Relevant medical, sleep and medication history
6. Examination findings
7. Prior tests and treatments
8. Specific question for the specialist

This outline works for most sleep referrals. It can be adapted for children, veterans or complex cases.

What to leave out

Avoid unrelated history that obscures the main problem. Do not include speculative diagnoses without evidence. Do not copy pages of old records when a one-paragraph summary will do. The specialist can request more detail if needed.

What patients can prepare

• A one-page summary of symptoms and timeline
• A sleep diary for two weeks
• A medicine list, including over-the-counter products
• Copies of previous sleep studies and reports
• Questions they want answered
• Information about work, driving and safety-critical duties

You can give this to your GP before they write the letter. It saves time and reduces the chance that important details are missed.

Urgent referrals

Some symptoms need expedited assessment rather than routine triage: severe daytime sleepiness while driving, witnessed apneas with heart failure, pregnancy with suspected apnea, a child with breathing pauses, or new confusion. State these clearly at the top of the letter and follow the local urgent pathway.

What if the GP will not refer?

Ask why. Sometimes the issue is a local policy, a missing test or a belief that the problem is not severe enough. Provide more detail if you can. If you still disagree, ask about the practice's complaints or second-opinion process. In some countries, private clinics accept self-referrals, though insurance may not reimburse without a referral.

Do not delay urgent care if you have severe breathlessness, chest pain, fainting or a child with breathing pauses.

Electronic referrals

Many systems use electronic referrals with structured fields. If your GP uses one, ask whether the free-text section includes the detail above. A structured form can be efficient, but it can also lose nuance. Add a short note if the form does not capture the safety concerns.

After the referral

Ask the clinic what to expect: waiting time, tests, and whether you need to bring anything. If your symptoms change while you wait, contact the referring clinician. A referral is not a guarantee of an appointment date, and it can be redirected if the service is not the right one.

Country differences

In the US, a referral letter may be required by insurance or the clinic. In the UK, an NHS referral is usually made through the GP and triaged locally. Canada, Australia, New Zealand and Ireland use referral-based public systems, with private clinics offering different access. The content is similar; the paperwork and payment rules differ.

For preparing for the appointment, see the appointment preparation guide. For referral rules, see the referral guide. To find a clinic, use the sleep doctor near me directory.

This article is general information, not medical advice. It does not replace an assessment by a qualified clinician who can review the patient's history and test results.