Otorhinolaryngology focuses on the ear, nose, and throat. Learn about the diagnosis and treatment of hearing loss, sinusitis, tonsillitis, and voice disorders.
Send us all your questions or requests, and our expert team will assist you.
Diagnosis and tests are the cornerstone of effective sleep apnea management, especially for international patients seeking specialist care in Istanbul. Whether you experience loud snoring, daytime fatigue, or unexplained hypertension, a thorough evaluation can pinpoint the underlying cause and guide personalized treatment. According to recent epidemiological data, up to 1 in 5 adults worldwide shows signs of obstructive sleep apnea, yet many remain undiagnosed.
This page is designed for patients, caregivers, and referring physicians who need a clear, step‑by‑step overview of the diagnostic pathway offered at Liv Hospital. We will walk you through the clinical interview, physical examination, sleep study options, imaging techniques, and ancillary laboratory assessments. By understanding each component, you can make informed decisions and feel confident about the care journey ahead.
Our multidisciplinary sleep‑medicine team combines state‑of‑the‑art technology with a 360‑degree international patient service, ensuring smooth coordination from your first appointment to post‑diagnostic counseling.
Sleep apnea is a spectrum of breathing disorders that interrupt normal respiration during sleep. The most common form, obstructive sleep apnea (OSA), occurs when the upper airway collapses, leading to brief pauses in breathing that can last from a few seconds to over a minute. Central sleep apnea, though less frequent, involves a failure of the brain to send proper signals to the breathing muscles.
Beyond nighttime symptoms, untreated sleep apnea can contribute to cardiovascular disease, metabolic dysfunction, cognitive decline, and reduced quality of life. Recognizing these risks underscores why accurate diagnosis and tests are essential. At Liv Hospital, we assess both the severity of airway obstruction and its systemic consequences, tailoring the work‑up to each patient’s medical history and lifestyle.
Key indicators that prompt a full diagnostic work‑up include:
The first step in the diagnosis and tests pathway is a detailed clinical interview. Our sleep specialists collect information about sleep patterns, daytime symptoms, comorbid conditions, and lifestyle factors such as alcohol use or smoking. A structured questionnaire, often incorporating the STOP‑Bang or Berlin tools, helps quantify risk and prioritize further testing.
During the physical examination, clinicians focus on airway anatomy and cardiovascular health.
The gold standard for diagnosis and tests in sleep apnea is overnight polysomnography (PSG) performed in a sleep laboratory. PSG records brain waves, eye movements, muscle activity, heart rhythm, airflow, respiratory effort, and oxygen saturation. This comprehensive data allows precise calculation of the apnea‑hypopnea index (AHI), which classifies severity as mild (5–15 events/hour), moderate (15–30), or severe (> 30).
For patients who travel internationally or prefer a less intrusive setting, Liv Hospital also offers a Home Sleep Apnea Test (HSAT). HSAT devices monitor airflow, respiratory effort, and oxygen levels, providing a reliable AHI estimate for patients with a high pre‑test probability of OSA. While HSAT cannot capture sleep stages, it is a cost‑effective alternative when full PSG is not immediately feasible.
Below is a quick comparison of the two modalities:
Our sleep laboratory adheres to international standards, offering a quiet, temperature‑controlled environment and a team of certified technologists to ensure data quality and patient comfort.
When clinical evaluation suggests structural contributors to airway collapse, imaging becomes an integral part of the diagnosis and tests protocol. Computed tomography (CT) and magnetic resonance imaging (MRI) provide three‑dimensional views of the nasopharynx, oropharynx, and hypopharynx, revealing soft‑tissue enlargement, tonsillar hypertrophy, or skeletal abnormalities.
Dynamic imaging, such as drug‑induced sleep endoscopy (DISE), allows real‑time visualization of airway behavior during a sedated state that mimics sleep. DISE helps surgeons identify the exact level of obstruction, informing decisions about surgical interventions like uvulopalatopharyngoplasty or mandibular advancement devices.
Additional specialized tests include:
All imaging studies are performed using low‑dose protocols and interpreted by radiologists experienced in sleep‑disorder anatomy, ensuring accurate, clinically relevant reports.
Sleep apnea often coexists with metabolic and cardiovascular disorders. As part of the comprehensive diagnosis and tests package, Liv Hospital orders baseline laboratory panels to screen for dyslipidemia, glucose intolerance, and inflammatory markers. These tests help identify patients who may benefit from concurrent medical management.
Cardiovascular evaluation may include an electrocardiogram (ECG), echocardiography, and ambulatory blood pressure monitoring. Persistent nocturnal hypoxia can lead to left ventricular hypertrophy and arrhythmias; early detection enables timely cardiology referral.
For patients with suspected central sleep apnea, arterial blood gas analysis and nocturnal capnography are valuable. These tests assess CO₂ retention and guide decisions about adaptive servo‑ventilation or supplemental oxygen therapy.
After completing the suite of diagnosis and tests, our multidisciplinary team convenes to synthesize findings. The apnea‑hypopnea index, oxygen desaturation patterns, anatomical imaging, and comorbidity profile together shape the treatment roadmap.
Typical pathways include:
Our patient coordinators assist international travelers with scheduling follow‑up appointments, arranging interpreter services, and organizing accommodation near the hospital. This seamless support ensures that the diagnostic journey translates into effective, sustained treatment.
Liv Hospital is a JCI‑accredited, internationally recognized center that combines cutting‑edge technology with a dedicated 360‑degree patient service. Our sleep‑medicine program is staffed by board‑certified specialists, experienced technologists, and multilingual coordinators who understand the unique needs of patients traveling from abroad. From the initial consultation to post‑diagnostic care, we provide a seamless, compassionate experience designed to deliver accurate diagnosis and optimal outcomes.
Ready to take the first step toward better sleep? Contact Liv Hospital today to schedule your comprehensive sleep assessment and experience world‑class care in Istanbul.
Our international patient team will guide you through every detail, from travel logistics to personalized treatment planning.
Liv Hospital Ulus
Asst. Prof. MD. Mustafa Taştan
Otorhinolaryngology
Liv Hospital Ulus
Prof. MD. Abdulkadir Özgür
Otorhinolaryngology
Liv Hospital Ulus
Prof. MD. Ömer Erdur
Otorhinolaryngology
Liv Hospital Vadistanbul
Prof. MD. Ahmet Hakan Birkent
Otorhinolaryngology
Liv Hospital Vadistanbul
Prof. MD. Arzu Yasemin Korkut
Otorhinolaryngology
Liv Hospital Vadistanbul
Prof. MD. Selçuk Güneş
Otorhinolaryngology
Liv Hospital Bahçeşehir
Op. MD. Musa Musayev
Otorhinolaryngology
Liv Hospital Bahçeşehir
Op. MD. Sevim Pırıl Karasu
Otorhinolaryngology
Liv Hospital Bahçeşehir
Prof. MD. Hakan Göçmen
Otorhinolaryngology
Liv Hospital Bahçeşehir
Prof. MD. Kamil Hakan Kaya
Otorhinolaryngology
Liv Hospital Bahçeşehir
Spec. MD. Murat Benzer
Otorhinolaryngology
Liv Hospital Topkapı
Op. MD. Ayfer Ulçay
Otorhinolaryngology
Liv Hospital Topkapı
Op. MD. Recep Haydar Koç
Otorhinolaryngology
Liv Hospital Ankara
Asst. Prof. MD. Bahar Kayahan Sirkeci
Otorhinolaryngology
Liv Hospital Ankara
Asst. Prof. MD. Merve Tunca
Otorhinolaryngology
Liv Hospital Ankara
Op. MD. Sevinç Bayrak
Otorhinolaryngology
Liv Hospital Ankara
Prof. MD. Doğan Atan
Otorhinolaryngology
Liv Hospital Ankara
Prof. MD. Taylan Gün
Otorhinolaryngology
Liv Hospital Gaziantep
Assoc. Prof. MD. Mustafa Çelik
Otorhinolaryngology
Liv Hospital Samsun
Op. MD. Tunç Üstün
Otorhinolaryngology
Liv Hospital Samsun
Op. MD. Yunus Karadavut
Otorhinolaryngology
Liv Bona Dea Hospital Bakü
Spec. MD. REŞAD QUVALOV
Otorhinolaryngology
Op. MD. Aydın Eroğlu
Otorhinolaryngology
Spec. MD. Reşad Guvalov
Otorhinolaryngology
Send us all your questions or requests, and our expert team will assist you.
Patients who present with persistent loud snoring or choking episodes during sleep should be evaluated for sleep apnea. When a bed partner reports observed apneas, the suspicion increases. Excessive daytime sleepiness measured by the Epworth Sleepiness Scale is another red flag. Cardiovascular signs such as resistant hypertension or atrial fibrillation, especially in the presence of obesity, large neck circumference, or craniofacial abnormalities, also prompt a full diagnostic work‑up. Recognizing these indicators early helps prevent long‑term complications.
Polysomnography is the gold‑standard sleep study performed overnight in a sleep laboratory. It captures brain waves, eye movements, muscle tone, heart rhythm, airflow, respiratory effort, and oxygen saturation, allowing precise calculation of the apnea‑hypopnea index (AHI) and sleep stage analysis. In contrast, a home sleep apnea test uses a portable device that typically measures airflow, respiratory effort, and oxygen saturation only. HSAT is suitable for patients with a high pre‑test probability of obstructive sleep apnea and provides a reliable AHI estimate, but it cannot assess sleep architecture or detect certain disorders that require full PSG.
When structural contributors are suspected, computed tomography (CT) and magnetic resonance imaging (MRI) offer three‑dimensional views of the nasopharynx, oropharynx, and hypopharynx, revealing soft‑tissue enlargement, tonsillar hypertrophy, or skeletal abnormalities. Dynamic imaging with drug‑induced sleep endoscopy (DISE) allows clinicians to visualize the airway in a sedated, sleep‑like state, pinpointing the exact level of collapse. Additional tools such as acoustic rhinometry, cephalometric X‑ray, and upper airway resistance testing can further characterize nasal geometry and airflow limitation.
Sleep apnea frequently coexists with metabolic and cardiovascular disorders. A baseline laboratory panel screens for dyslipidemia, impaired glucose tolerance, and systemic inflammation, helping to identify patients who may need concurrent medical management. Cardiovascular assessment often includes an electrocardiogram (ECG), transthoracic echocardiography, and 24‑hour blood pressure monitoring to detect left ventricular hypertrophy, arrhythmias, or nocturnal hypertension. For suspected central sleep apnea, arterial blood gas analysis and nocturnal capnography evaluate CO₂ retention and guide therapy such as adaptive servo‑ventilation.
During DISE, a sedative replicates the muscle relaxation of natural sleep while a flexible endoscope records real‑time video of the upper airway. The procedure identifies the exact site(s) of obstruction—nasal, palatal, tongue base, or epiglottic—allowing surgeons to plan targeted interventions. DISE is typically ordered after a clinical evaluation and imaging suggest anatomical contributors but the precise level of collapse remains unclear. It is especially valuable for patients being considered for surgical procedures such as uvulopalatopharyngoplasty, nasal valve repair, or hypoglossal nerve stimulation.
BlogEar Nose ThroatMar 13, 2026Dizziness is a common problem that affects millions globally. It’s a big reason for visits to the eme...
BlogEar Nose ThroatMar 11, 2026Snoring is a common sleep issue that affects both men and women. But, its causes and prevalence can differ ...
BlogEar Nose ThroatMar 11, 2026Loud snoring is more than just a nighttime nuisance. It’s often a warning sign of underlying health i...
BlogEar Nose ThroatMar 11, 2026Imagine sleeping soundly through the night, without the interruptions of snoring. NightLase, a new non-inva...
BlogEar Nose ThroatMar 11, 2026Snoring is a common sleep issue that many adults face. Studies show that over 30% of adults snore. This num...
BlogEar Nose ThroatMar 11, 2026Imagine waking up feeling refreshed, without the annoying sound of snoring. New medical technologies are ch...
Get instant answers from our medical team. No forms, no waiting — just tap below to start chatting now.
Start Chat on WhatsApp or call us at +90 530 174 28 17