Lung Function Testing in Istanbul

What Are Lung Function Tests?

Lung function tests assess different aspects of breathing. Spirometry is one of the most commonly used methods and measures airflow and exhaled volume during a controlled procedure. Other pulmonary function tests can investigate lung volumes or gas transfer, so the term lung function testing does not describe one identical appointment everywhere.

This page focuses mainly on spirometry and, when appropriate, assessment after a bronchodilator. At Istanbul Allergy, children and adults can enquire about a consultation and suitable breathing tests. Tell our team what symptoms or previous findings need review before booking. Confirm the actual assessment scope if a specialised investigation has been requested; this page does not promise every laboratory lung-function procedure. The aim is an understandable explanation of what the measurements mean and how they contribute to the next step in care.

What Is Spirometry?

Spirometry measures the air exhaled during a breathing manoeuvre through a mouthpiece connected to a spirometer. The patient takes a full breath and then exhales forcefully and for long enough to produce an acceptable recording. The test is performed with guidance rather than by simply breathing normally into a tube.

Ask the operator to explain and demonstrate the manoeuvre before you begin. It can take practice to coordinate the full breath, seal around the mouthpiece and continued exhalation. The aim is a technically useful measurement, not to achieve a particular number through extra effort or repeat attempts without supervision. If the procedure is difficult, tell the team. The interpretation should take account of how the test was performed as well as the values printed on the report.

When Might a Breathing Test Be Useful?

Spirometry can contribute to investigation of respiratory symptoms and review of an established condition. It may be considered when asthma or another airflow problem is suspected, but the test is interpreted with the clinical history rather than used to label every cough or episode of breathlessness on its own.

Explain whether symptoms involve wheeze, chest tightness, coughing, reduced exercise tolerance or intermittent breathing difficulty. Tell the clinician what has already been investigated and whether you are seeking a first assessment or a second opinion. Ask how the result could change the diagnosis, treatment discussion or follow-up. If the clinical question needs another investigation, that should be clarified rather than assuming a general lung-function booking answers every possible respiratory concern.

What to Prepare Before the Consultation

Prepare a concise timeline of symptoms, existing diagnoses, urgent-care visits and treatment. Describe patterns across the day, during sleep, with exercise, at work and in different seasons. Bring earlier spirometry reports, other relevant tests and a current medication list.

Include the names of inhalers and how you actually use them, rather than only what was prescribed. Explain recent illness and any important health changes. For a child, caregiver observations and changes in play or school activity can help. If earlier reports seem inconsistent, bring the complete documents with dates and test conditions. A useful consultation connects the measurements with the symptom pattern; it should not rely only on how the patient feels during the short period when the test is performed.

Spirometry in Children

Children need to understand and perform the required breathing manoeuvre to obtain a useful spirometry result. A trained operator can coach the technique and use age-appropriate explanations. Suitability depends on the individual child and test requirements rather than an assumption that every child of a given age will perform identically.

When booking, provide the child’s age and any previous experience with breathing tests. Ask how to explain the appointment and whether a caregiver can support the child during instruction. Describe it as following a breathing game or demonstration, without promising that the result is a pass-or-fail measure of effort. If an acceptable recording cannot be obtained, the clinician can explain whether another attempt or a different assessment is appropriate. Difficulty completing spirometry does not by itself prove or exclude asthma.

Adult Respiratory Assessment

Adults may seek spirometry for new respiratory symptoms, review of a known diagnosis or questions about an earlier result. The assessment should consider the symptom pattern, current treatment, smoking and relevant exposures. Spirometry is one part of this review, not a substitute for examining other possible causes of symptoms.

Tell the clinician about work materials, exercise limitation and other health conditions. Explain whether the main concern is diagnosis, treatment response or a change over time. If another specialist is involved, bring their reports so the assessment can build on existing information. Patients travelling to Istanbul should confirm what the booked consultation includes and whether a more specialised respiratory service is needed. Clarifying that before travel helps match the appointment to the clinical question rather than an expectation that every lung test is performed in one setting.

The Role of Spirometry in an Asthma Assessment

Asthma assessment combines a suggestive clinical history with appropriate objective evidence. Spirometry can contribute information about airflow, and additional testing may be needed depending on the findings, age and treatment. The diagnostic pathway should explain how each result supports or leaves uncertainty about the diagnosis.

If asthma is suspected, describe symptoms between episodes as well as during attacks. Tell the clinician whether treatment has already started and how it changed the pattern. Do not independently stop an effective inhaler to make the test more abnormal. Our Asthma Treatment page explains the broader care pathway. A useful assessment should clarify what has been established, whether another investigation would help and how symptoms should be managed while the diagnostic discussion continues.

What Is Bronchodilator Response Testing?

When appropriate, spirometry can be repeated after an inhaled bronchodilator to assess the change in airflow measurements. The team first obtains a baseline recording, administers the selected medicine under the agreed procedure and repeats testing after the required interval. This is also commonly called reversibility testing.

Ask why this step is relevant to your assessment and whether it has been included in the appointment. Tell the team about medicines already used that day and relevant health conditions. A before-and-after comparison requires suitable recordings and clinical interpretation; it is not simply a trial of whether you immediately feel better. The operator should explain the breathing procedure and what to report if you experience symptoms. Do not recreate a challenge at home by changing inhaler doses to test your own response.

How a Bronchodilator Response Is Interpreted

A response describes the change in measured lung function under the test conditions. The clinician considers its size, the method used and the wider clinical picture. A response is not a promise of permanent reversal of a respiratory condition, and absence of a significant response on one occasion does not settle every diagnostic question.

Ask which measurements changed and what the finding contributes to the assessment. Was the test performed on or off the relevant treatment, according to the planned purpose? Were the recordings technically acceptable? If the history and result do not agree, ask what next step would be useful rather than choosing whichever information seems most reassuring. Your report should describe the interpretation and any remaining uncertainty clearly enough to support the clinician managing future care.

Inhalers and Other Medicines Before Testing

Preparation depends on the clinical purpose and actual medicines. Some appointments require an agreed interval without particular bronchodilators, while others assess lung function during usual treatment. The instruction must fit the prescription and patient. Do not stop inhalers or other essential medicines independently.

Send the active ingredients and schedule where possible, including combination inhalers, occasional relievers and recent steroid treatment. Ask for written instructions rather than applying one generic stopping time to every product. If you need a reliever because symptoms worsen, follow your prescribed care plan and inform the team. Do not leave breathing symptoms untreated just to preserve an appointment. Report anything taken after preparation instructions, including the name and time, so the clinician can decide how it affects the assessment.

Food, Smoking, Clothing and Exercise Preparation

Patient instructions may address smoking, alcohol, strenuous exercise, a large meal and clothing that restricts a full breath. Follow the preparation supplied for your actual booking, including the relevant time intervals. Requirements can differ when several investigations are planned together.

Arrive with enough time to explain any preparation difficulty and ask questions before starting. You do not need to make broad dietary changes or deliberately expose yourself to an allergen for spirometry. If you are also having FeNO or another assessment, ask for a combined plan that distinguishes the instructions for each. Bring inhalers and relevant reports as requested. For a child, comfortable clothing and a calm explanation may help more than rehearsing repeated forceful blows without clinical guidance.

When Suitability Needs Review Before the Test

Spirometry involves a forceful breathing manoeuvre, so relevant medical history and current health must be reviewed. Recent surgery, significant cardiovascular events, an infection or other conditions may affect the balance of benefit and risk. Some factors are relative precautions rather than automatic permanent exclusions; the clinician decides what is appropriate.

Tell the team about a recent operation, new chest pain, fainting, changes in health or any concern raised by another clinician. Do not assume that a test must proceed because it has already been booked. Ask whether consultation can still be useful if the procedure is deferred. International patients should report a significant change before travel, particularly when several tests are planned. A clear suitability review helps ensure that the visit is organised around the patient’s needs rather than only the available testing slot.

What Happens During Spirometry?

The team checks relevant details and explains the breathing manoeuvre. A mouthpiece is used, and a nose clip may help prevent air escaping through the nose. The operator guides the full inhalation and the forceful, sustained exhalation, with repeated attempts as needed to obtain acceptable measurements.

Listen for instructions throughout the blow rather than stopping as soon as the first effort feels complete. If a seal is difficult or you cough, tell the operator so the attempt can be assessed appropriately. You can ask for a pause or further demonstration. The goal is reproducible, interpretable information. The operator should not simply print the first number without considering the recording, and you should not feel that a difficult attempt has to be concealed to avoid disappointing the team.

Why Technique and Repeatability Matter

Test quality is central to interpretation. An incomplete breath, early termination, cough, leakage or inconsistent attempts can affect the recording. ATS/ERS technical standards address performance and quality so that a result can be considered in light of how reliably it represents the patient’s lung function.

Ask whether the session produced technically acceptable recordings and whether any limitation should be noted on the report. Multiple attempts are intended to support quality, not to make the lungs improve through repetition. If the test remains limited, the clinician can discuss what can still be inferred and whether another assessment is useful. Do not compare a low-quality earlier attempt with a later reliable session as if every numerical difference must represent disease progression or recovery.

Understanding FEV1, FVC and the Ratio

FVC is the volume exhaled during a full forced manoeuvre. FEV1 is the volume exhaled in its first second. The FEV1/FVC ratio compares those measurements and contributes to assessment of airflow patterns. These are physiological measures, not percentages of lung damage or oxygen levels.

Ask the clinician to explain the combination rather than focus on whichever line is coloured or marked low. The curves and test quality also matter. A number that looks reduced can have more than one explanation, and the history helps determine what further assessment is appropriate. Keep the complete report with its units, reference information, date and treatment circumstances. That makes it more useful for future comparison than a photograph of one isolated value or a remembered statement that the lungs were a certain percentage normal.

Predicted Values, Lower Limits and z-Scores

Lung-function interpretation compares measurements with appropriate reference values. Age, height and other relevant characteristics are considered through the reference equations. Lower limits of normal and z-scores can help interpretation; one fixed percentage should not be applied as a complete universal rule to every patient.

Ask whether the reference information is appropriate and clearly reported. For children, changing body size is important when comparing visits. Adults should also provide accurate details rather than assume a prediction is an individual target that must be reached exactly. A value near a reference boundary needs clinical interpretation, not an automatic diagnosis from the label alone. The report should explain the pattern and significance in relation to symptoms and quality, rather than leave the patient to calculate a diagnosis independently.

Obstructive, Possible Restrictive and Other Patterns

Spirometry can suggest an airflow-obstruction pattern or findings that require further investigation. A low FVC does not by itself confirm restriction; lung-volume measurement may be needed to resolve that question. Physiological patterns should not be treated as a complete diagnosis of a specific disease without clinical assessment.

Ask what the observed pattern means and whether any additional test would change care. If a specialist lung-volume or gas-transfer assessment is proposed, confirm the appropriate service and availability separately. This page does not promise every advanced pulmonary-function investigation at the clinic. A useful explanation distinguishes a finding that can be interpreted now from one that needs another method. Avoid assuming an unfamiliar pattern on the report means a particular serious condition before the clinician has reviewed the full information.

Can Spirometry Be Normal Despite Symptoms?

A normal recording on one occasion does not exclude every cause of respiratory symptoms or every asthma presentation. Symptoms can vary, and treatment and timing matter. An assessment may need additional evidence when the clinical history remains suggestive despite a reassuring session.

Tell the clinician whether the testing day differed from usual and what treatment was used. Do not deliberately provoke symptoms before a repeat test. Ask what remains uncertain and whether another investigation, planned monitoring or review of a different diagnosis is appropriate. A normal result should narrow the question in a useful way rather than dismiss persistent symptoms. Equally, it should not automatically lead to repeated testing without a plan for how another result would change the assessment.

How Does FeNO Fit With Spirometry?

FeNO measures nitric oxide in exhaled breath and can provide information about a particular airway-inflammatory pattern. Spirometry measures airflow and volume during a different breathing manoeuvre. These methods can contribute complementary information and are not interchangeable versions of the same test.

Ask why one or both methods are proposed and how the findings will be considered together. A high FeNO does not identify a specific allergen, while spirometry does not measure every aspect of airway inflammation. Our FeNO Testing page explains that pathway. Confirm preparation for the complete appointment, since the requirements may differ. The team should explain the sequence and interpretation so that several test reports become one coherent assessment rather than a collection of unrelated high or low values.

Peak Flow and Other Breathing Measurements

Peak flow monitoring and other respiratory investigations may be used for defined clinical questions, but they are not all equivalent to a full spirometry session. Ask what the requested measurement can show and how it fits the assessment. A home reading should be used according to a clinician’s plan rather than treated as a complete diagnosis.

If you already keep a peak-flow record, bring the dates, device details and associated symptoms or treatment changes. Do not select only the best and worst values without the surrounding context. If another specialist test is proposed, clarify its purpose and whether a separate appointment is required. The appropriate combination depends on the clinical question and patient, not on the assumption that completing every available test at once is always more useful.

Discomfort, Dizziness and Bronchodilator Effects

Repeated forceful breathing can feel tiring, and dizziness or discomfort should be reported promptly. If a bronchodilator is administered, effects such as shakiness or a faster heartbeat can occur. Relevant medicines and rhythm problems should be disclosed before that part of the appointment.

Tell the operator immediately if you feel unwell, need to stop or do not understand the instructions. Do not push through significant pain or concerning symptoms to complete another blow. Ask what to expect after the test and when the team would want you to seek advice. If the procedure is stopped, the report should reflect what was completed and why. A useful assessment does not depend on ignoring symptoms or treating every patient as able to perform the same number of attempts without difficulty.

Appointment Duration and Receiving the Result

The time needed depends on the consultation, explanation, acceptable attempts and any additional procedure. A bronchodilator comparison includes an interval before repeat measurements. Children may need extra time for instruction or rest. Confirm the expected duration for your actual booking instead of assuming one brief blow completes the visit.

Ask whether the clinical interpretation is discussed that day or in a separate appointment. Before leaving, check how you will receive a copy and whether another result is still pending. Patients travelling from abroad should allow time for the assessment rather than plan an immediate onward journey around the shortest possible device time. The appointment should leave you understanding what the recording showed, how reliable it was and what action, if any, follows.

Using Spirometry During Treatment Follow-Up

A follow-up review should consider symptoms, activity, attacks, treatment and relevant objective measurements together. A change in spirometry can be useful, but its interpretation needs the broader clinical history and quality information. One improved value does not independently prove permanent resolution of a respiratory condition.

Bring previous reports and explain what changed between visits, including actual inhaler use and recent illness. Ask what improvement the plan is intended to achieve and when reassessment is useful. If treatment remains difficult to follow, describe why so the plan can be made more practical. Our Asthma Treatment page covers broader management questions. A useful review translates findings into an understandable care plan rather than uses the printout as a replacement for discussing how the patient is actually doing.

Comparing Earlier Reports and Repeat Testing

For a second opinion, provide complete reports with dates, baseline and post-bronchodilator measurements where performed, reference information and quality comments. A numerical comparison is more meaningful when the circumstances and purpose of both sessions are known.

Ask whether repeating spirometry would answer an unresolved question now or merely duplicate an adequate recent assessment. If a repeat is appropriate, clarify what decision it will inform. Do not assume every difference between laboratories reflects a change in disease; technique, preparation and reporting can matter. For children, growth also needs to be considered. The clinical review should explain whether the apparent change is meaningful and what further information is needed, rather than turn two isolated percentages into a conclusion about progression or recovery.

Planning Lung Function Testing in Istanbul

Contact Istanbul Allergy with the patient’s age, main symptoms, current medicines and previous investigations. Explain whether the request is an initial assessment, review of an existing diagnosis or interpretation of earlier spirometry. Ask about a consultation with Prof. Dr. Ahmet Akçay and confirm the appropriate service scope before travel.

Our address is Harbiye Mah., Teşvikiye Cad., Karaosmanoğlu Apartmanı, No: 37, Floor 3, Şişli, Istanbul, opposite City’s Shopping Mall. Confirm consultation language, arrival details and how records should be shared. Ask whether translation is needed. The Plan Your Visit page offers practical preparation information. Report a new illness or significant health change before departure so that the planned investigations can be reviewed rather than assumed suitable regardless of circumstances.

Costs, Online Review and Care After Returning Home

Ask what the consultation and spirometry fees include, whether bronchodilator response testing or FeNO is priced separately and whether interpretation and later review are included. No universal package covering every pulmonary-function test is promised on this page. Confirm the quotation for the actual planned assessment.

Selected history discussions or report reviews may be suitable for an online consultation. A spirometry measurement needs appropriate equipment and supervision; an ordinary video appointment does not perform the test. If you live abroad, ask how findings should be shared with your usual clinician and what follow-up can be arranged locally. Before the visit ends, make sure the next decision is clear, including any remaining uncertainty, treatment advice and the circumstances that require earlier clinical review.

When Breathing Symptoms Need Immediate Care

A planned breathing test is not treatment for a serious asthma attack or acute respiratory deterioration. Follow the prescribed action plan and seek urgent local care for severe or worsening breathing difficulty. In Turkey, call 112 for an emergency. Do not wait for a spirometry appointment or a routine WhatsApp response.

If symptoms require treatment before objective testing can be completed, do not withhold necessary care to obtain an untreated result. Tell the clinicians what medicines have already been used and keep any urgent-care records. The later assessment can interpret results in that context and consider which investigations remain useful. A scheduled visit should support care after the immediate problem has been addressed, not become a reason to delay seeking help during a dangerous episode.

YOUR QUESTIONS

Lung Function Testing: Frequently Asked Questions

Scientific Sources & Further Reading

General information does not establish an individual respiratory diagnosis or authorise independent medicine changes. Suitability, preparation, test scope and follow-up are confirmed through clinical assessment.

1. NHS: Spirometry. ↗
2. American Thoracic Society: Pulmonary function tests. ↗
3. ATS/ERS: Standardisation of spirometry, 2019 update. ↗
4. ERS/ATS: Interpretive strategies for routine lung function tests, 2022. ↗
5. ERS: Clinical interpretation of spirometry. ↗
6. United Lincolnshire Hospitals: Bronchodilator response testing. ↗
7. North Tees and Hartlepool NHS: Breathing tests in children. ↗
8. Great Ormond Street Hospital: Lung function tests. ↗
9. Evelina London: Children’s allergy assessment and lung-function testing. ↗
10. NHS England: FeNO testing. ↗
11. NHS: Asthma. ↗
12. BTS/NICE/SIGN: Asthma diagnosis, monitoring and management, NG245. ↗