How Is Sleep Apnea Diagnosed?
A home sleep test is usually all it takes. No overnight hospital stay, no wires, no waiting list.
A lot of patients who come to us for a sleep apnea diagnosis have already talked themselves out of getting one. They picture a hospital ward at 11pm: bright lights, a technician taping wires to their scalp while they lie there knowing they will not sleep a wink. So they put it off another year.
For obstructive sleep apnea, that is not how we diagnose people anymore. The test goes home with you. You sleep in your own bed. The device is the size of a paperback novel and clips to a strap across the chest. No admission, no scalp wires, no one watching you try to drift off.
What confirms the diagnosis is a sleep study, and what the study produces is one important number: the AHI. That number tells your doctor whether you have sleep apnea and, if you do, how severe. At Respire, the sleep data is reviewed within 48 to 72 hours of the test night. Most patients have a confirmed diagnosis within a week of their first appointment.
Step 1: What Happens Before the Sleep Test
Before any equipment comes out, we talk. The first appointment is a conversation, not a procedure, and it does most of the diagnostic work.
What your doctor will ask
A first sleep consultation at Respire runs about 30 to 45 minutes. Some of the questions are obvious, others less so: whether you snore and how often, whether anyone has watched you stop breathing or jolt awake gasping, whether you wake with a headache or dry mouth, and how much daytime fatigue you experience. If your partner has watched you stop breathing during sleep, tell us. That observation on its own is one of the strongest predictors of OSA in adults (American Academy of Sleep Medicine, Kapur et al., J Clin Sleep Med 2017).
Medical history matters too. Hypertension that does not respond well to three drugs. Type 2 diabetes with poor control. A heart rhythm problem, atrial fibrillation in particular. All of these shift the pre-test probability of OSA upward.
The Epworth Sleepiness Scale
The Epworth Sleepiness Scale is a validated eight-question questionnaire that measures daytime sleepiness. You rate, on a scale of 0 to 3, how likely you are to doze off in eight everyday situations. A total score of 10 or above suggests excessive daytime sleepiness and is a clinical indicator for sleep study referral. A score of 16 or above is high, and we would usually arrange testing within the week.
Physical examination
The exam is short. We measure neck circumference: a collar bigger than 43 cm in men, or 40 cm in women, materially raises the odds of OSA. We also examine the upper airway for crowding at the back of the throat, enlarged tonsils, a long soft palate, or a deviated nasal septum. Both Dr. Pradyut Waghray and Dr. Kunal Waghray do the airway exam during the sleep appointment itself, rather than sending the patient out for a separate ENT visit.
Step 2: The Sleep Study, Home or In-Lab?
Not all sleep studies are the same. The type of test you receive depends on your symptoms, your medical history, and what the study needs to confirm or rule out. This is a clinical decision, not a patient preference.
Home sleep apnea test (HSAT)
A home sleep apnea test is a portable monitor worn overnight at home. It measures airflow through the nose and mouth, breathing effort via a soft chest belt, blood oxygen levels (SpO2) via a finger clip, pulse rate, and body position. For adults with a high clinical probability of moderate to severe OSA, no significant cardiac or respiratory comorbidities, and no suspicion of central apnea, the home sleep study in Hyderabad is the appropriate test. The AASM has recommended HSAT as a first-line diagnostic tool for uncomplicated OSA since its 2017 clinical practice guideline.
In-lab polysomnography (PSG)
Polysomnography is the full overnight sleep study conducted in a clinic. Sensors measure up to 20 parameters: brain waves, eye movements, oxygen levels, heart rhythm, breathing effort, leg movements, snoring, and body position.
When a home test is not appropriate
In-lab PSG is required when central sleep apnea is suspected, when a prior home test was inconclusive, when the patient has significant heart failure, advanced COPD, or a neuromuscular condition, when another sleep disorder such as REM behaviour disorder is also suspected, or when the patient is a child. If your doctor recommends an in-lab study, it is because your clinical picture is more complex than a home test can capture.
What Happens During a Home Sleep Test
The night of the test, you sleep at home. In your bed, in your own room, with the lights you like. Nothing about the routine changes except the equipment you wear.
The recorder itself is about the size of a slim paperback. It hangs from a strap across your chest. There are three sensors: a thin nasal cannula that sits just inside the nostrils, a soft elasticated belt around the chest picking up breathing effort, and a small clip on the index finger that reads blood oxygen and pulse. Fitting all three takes five to ten minutes. Most patients tell us they were aware of the nasal cannula for the first ten minutes and then forgot it was there.
In the morning, you remove the device and return it to the clinic or arrange collection. At Respire, a pulmonologist reviews the raw data from the recorder, not just the automated software output. Results are usually ready within 48 to 72 hours.
Two things to avoid on the test night
Avoid alcohol: even one or two drinks relax the upper airway muscles enough to push your AHI up artificially, and the result will not reflect a typical night. Also avoid sleeping tablets: sedatives change your breathing pattern. Unless your doctor has specifically told you to continue them, leave them out for that one night.
What Your AHI Score Means
When the recording is processed, one number rises to the top of the report: the AHI, or Apnea-Hypopnea Index. It tells us how many times an hour your breathing was either fully blocked or significantly reduced during sleep. The AHI does most of the work in setting the diagnosis and shaping what we do next.
Source: American Academy of Sleep Medicine, Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea (Kapur et al., J Clin Sleep Med 2017).
| OSA Severity | AHI Range | What It Means Clinically |
|---|---|---|
| Normal | Below 5 events/hour | No OSA diagnosis. If symptoms persist, look for another cause. |
| Mild OSA | 5 to 14 events/hour | Treatment is indicated if symptoms are significant. |
| Moderate OSA | 15 to 29 events/hour | Treatment recommended. CPAP is usually first-line. |
| Severe OSA | 30 or above events/hour | Treatment strongly indicated. CPAP and close follow-up. |
AHI is not the only number that matters
Your report will also show oxygen desaturation data. The most important figure is the T90 index: the percentage of recording time your SpO2 fell below 90%. A patient with even a mild AHI but a high T90 may need urgent review, particularly if they also have heart disease.
What if my home test result is normal but I still have symptoms?
A home test AHI under 5 does not always mean sleep apnea is ruled out. If clinical suspicion is high, an in-lab PSG may be the next step. Upper airway resistance syndrome (UARS) produces significant sleep fragmentation and daytime sleepiness without meeting the AHI threshold for OSA. It is diagnosed on full PSG, not on a home study.
The Respire Diagnostic Pathway: Four Steps
Here is what the diagnostic process actually looks like at Respire, from the first call to your treatment plan.
Initial consultation (30 to 45 minutes)
The consultant works through your symptoms, sleep history, Epworth score, medical background, and an airway exam. By the time you leave, you know whether a sleep study has been recommended and which kind.
Home sleep study arranged
If the home test is right for you, the device is handed over at the clinic with fitting instructions. Some patients take it home that evening. Others book a convenient night later in the week.
Pulmonologist review of the raw data (48 to 72 hours)
Dr. Pradyut Waghray or Dr. Kunal Waghray sits down with the recorder data, not the auto-generated summary. AHI is calculated, oxygen profiles mapped, and position-dependent events flagged. You receive a written report.
Diagnosis consultation and treatment plan
The follow-up appointment is where the result is discussed and a plan is agreed. Most patients leave the second appointment with a written diagnosis and a written plan in one sitting.
If OSA is confirmed, the treatment plan might include CPAP therapy at Respire, positional therapy, weight management, a mandibular advancement device, or a surgical referral. See our wider page on sleep apnea treatment in Hyderabad for the full set of options.
When You Do Not Need an In-Lab Study
Most adults with suspected OSA do not need a hospital sleep lab. A home test does the job.
It does not do the job for everyone. If you have moderate or severe heart failure, advanced COPD, neuromuscular disease, suspected central sleep apnea, or a previously failed CPAP titration, in-lab polysomnography is the proper test. Telling someone with congestive cardiac failure to do a home test because it is cheaper and easier is not kind. It delays a real diagnosis, and in those patients, delay matters.
For everyone else: one night, one device, one careful pulmonologist read. That is usually all it takes.
Your specialists
Sleep apnea diagnosis and treatment at Respire Airway Clinics is led by our senior respiratory physician and interventional pulmonologist, with combined experience spanning four decades.
Frequently asked questions
Can sleep apnea be diagnosed without a sleep study?
No. A confirmed sleep apnea diagnosis requires a sleep study. Questionnaires such as the Epworth Sleepiness Scale or STOP-Bang can indicate a high probability, but they are screening tools, not diagnostic ones. A sleep study, either at home or in a clinic, is needed to measure the AHI and confirm how often breathing is being interrupted.
How long does it take to get diagnosed with sleep apnea in India?
With a home sleep test, the timeline is short. An initial consultation, the home test on a convenient night, results reviewed within 48 to 72 hours, and a follow-up to discuss findings. The full process from first appointment to confirmed diagnosis is typically completed within a week. In-lab polysomnography may take longer depending on slot availability.
What is an AHI score and what does it mean?
AHI is the Apnea-Hypopnea Index. It counts the number of times per hour that breathing was either fully paused or significantly reduced during sleep. In adults, an AHI below 5 is normal, 5 to 14 indicates mild OSA, 15 to 29 is moderate OSA, and 30 or above is severe OSA. The full diagnosis also accounts for symptoms and oxygen desaturation.
Can I get a sleep apnea test done at home?
Yes. For most adults with suspected OSA and no major cardiac or respiratory comorbidities, a home sleep apnea test is the recommended first-line diagnostic. The device is provided by the clinic, worn overnight at home, and returned the next morning for review by a pulmonologist.
How accurate is a home sleep apnea test?
For uncomplicated obstructive sleep apnea in adults, a home sleep test is accurate and clinically validated. The AASM recommends it as a first-line diagnostic tool. Home tests measure fewer parameters than in-lab PSG and can modestly underestimate AHI because they calculate against recording time rather than confirmed sleep time. A sleep physician accounts for this when interpreting the result.
Do I need a referral to see a sleep specialist?
No. You can book a consultation at Respire directly. A referral from a general practitioner is not required.
What happens if my sleep study shows severe sleep apnea?
A result with an AHI of 30 or above means treatment is strongly recommended. For most patients, CPAP therapy is the first-line treatment and is highly effective. Your pulmonologist will discuss the full set of options at the follow-up appointment, including BiPAP, positional therapy, weight management, and surgical evaluation where appropriate. A severe result is not an emergency, but it does call for prompt action.
Does sleep apnea go away on its own?
Obstructive sleep apnea rarely resolves without treatment. It usually worsens over time, particularly with weight gain, ageing, or changes in upper airway structure. Untreated OSA carries documented risks including cardiovascular disease, metabolic complications, and cognitive impairment.
Book a Sleep Consultation
You started reading this page because something about your sleep is not right. For most of the patients who walk into our clinic, that thought first arrived months or years ago. They waited because they assumed diagnosis would be complicated. It usually is not. A home sleep study takes one night. A pulmonologist reviews the data. Within a week, you have an answer.
Respire Airway Clinics, Basheer Bagh and Jubilee Hills. All consultations are strictly confidential. No referral needed.
Reviewed by Dr. Pradyut Waghray, MBBS, MD, FRCP (London), FCCP, FAMS. 35+ years in pulmonology and sleep medicine.