How Sleep Apnoea Is Diagnosed in the UK (NHS and Private)

If you think you or your partner might have sleep apnoea, the idea of getting "tested" can feel daunting. In reality, the UK diagnostic pathway is well established, and understanding each step can make it far less worrying.

When to see a GP

Sleep apnoea is a genuine medical condition, not just heavy snoring, and it's worth taking seriously. You should book a GP appointment if you or your partner notice any of the following:

• Loud, habitual snoring, especially with gasping or choking sounds
• Pauses in breathing during sleep, noticed by a partner
• Waking up feeling unrefreshed despite a full night in bed
• Persistent daytime exhaustion, or falling asleep during quiet activities such as reading or watching television
• Morning headaches or a dry mouth on waking

These are worth mentioning to a GP promptly, particularly daytime sleepiness that affects driving or concentration at work. For a fuller picture of symptoms and causes, our guide to what sleep apnoea is is a good starting point.

Before your appointment: screening yourself

It helps to arrive at the GP with some structure rather than a vague sense that something isn't right. Two free tools can help you organise your thoughts.

The STOP-BANG questionnaire

This is a widely used screening tool that looks at snoring, tiredness, observed breathing pauses, blood pressure, BMI, age, neck size and sex. It won't diagnose anything on its own, but it gives a useful risk indication. Our page on the STOP-BANG questionnaire walks through each question and what your score might mean.

A quick online quiz

If you'd rather start somewhere simpler, our 60-second sleep quiz asks a handful of straightforward questions and gives you an idea of whether further investigation is worth pursuing. It's not a diagnosis, but it can help you decide whether to book that GP appointment.

The NHS pathway

If your GP suspects sleep apnoea after discussing your symptoms, and possibly asking your partner about what they've noticed, they will usually refer you to a local sleep clinic or respiratory service. Waiting times vary considerably by area, so it's worth asking your GP practice what to expect locally.

What the sleep clinic will do

Most NHS sleep clinics start with a home-based sleep study rather than an overnight stay in hospital. You'll be given a small monitoring device to take home, which you wear for one or more nights in your own bed. This typically measures things like your breathing pattern, oxygen levels, heart rate and snoring, without needing wires attached to a hospital machine.

You then return the device, and a sleep physiologist or clinician analyses the data. Some services will invite you back to discuss results in person; others will write to you or your GP with the outcome and next steps.

In-lab (polysomnography) studies

Occasionally, if the home study is inconclusive or your case is more complex, you may be asked to spend a night in a hospital sleep laboratory. This involves more detailed monitoring, including brain wave activity, and is generally reserved for cases where a simpler home test hasn't given a clear answer.

Private sleep apnoea testing

If you'd prefer not to wait for an NHS referral, or your GP suggests it as an option, private sleep testing is available across the UK. This usually follows a similar pattern to the NHS route.

• Initial consultation: a private GP or sleep specialist reviews your symptoms and history, sometimes using a questionnaire similar to STOP-BANG.
• Home sleep study: a monitoring device is posted to you or collected in person, and you wear it overnight at home, much like the NHS process.
• Results and consultation: a clinician reviews the data with you, usually within a week or two, and discusses whether treatment is recommended.

Private testing can be quicker than waiting for an NHS appointment, though costs vary between providers. It's sensible to check exactly what's included, whether that's the device, the clinical report, and a follow-up consultation, before booking.

What the results actually show

Sleep studies, whether NHS or private, generally measure how many times per hour your breathing is disrupted during sleep. This is often expressed as an index reflecting the frequency of pauses or shallow breathing episodes, alongside how much your oxygen levels dip. Clinicians use this alongside your symptoms to decide whether you have sleep apnoea, and if so, how significant it is.

It's worth remembering that a diagnosis isn't a verdict on how tired you feel alone. Some people with quite disrupted breathing patterns report feeling relatively fine, while others with milder patterns feel exhausted. Clinicians take both the data and your lived experience into account when recommending treatment.

After diagnosis: what happens next

If you're diagnosed with sleep apnoea, your clinician will talk you through treatment options, which might range from lifestyle changes and positional therapy for milder cases, through to CPAP therapy for more significant cases. This will usually involve a follow-up appointment to check how you're getting on with any treatment and whether adjustments are needed.

You can read more broadly about the condition, its causes and the range of treatments on our sleep apnoea hub.

A practical next step

If any of the red-flag symptoms above sound familiar, particularly gasping, choking or breathing pauses during sleep, or exhaustion that's affecting your daily life, please speak to a GP rather than waiting to see if things improve on their own. Getting a proper diagnosis is usually straightforward, and effective treatments are available once you know what you're dealing with.