An incentive spirometer is a handheld breathing device that encourages you to take slow, deep breaths to keep your lungs fully expanded. It’s most commonly handed to patients after surgery or during recovery from a lung illness like pneumonia. The device gives you visual feedback as you inhale, so you can track how deeply you’re breathing and watch your lung capacity improve over time.
How It Works
The device mimics what your body does naturally when you sigh or yawn. When you breathe in slowly through the mouthpiece, you create negative pressure inside your chest cavity, which pulls your lungs open more fully than normal shallow breathing would. This deeper expansion reaches the smallest air sacs in your lungs, helping to clear out mucus and fluid that can settle there when you’re inactive or recovering from illness.
Inside the clear plastic chamber, a piston or ball rises as you inhale. The higher it goes, the more air you’re pulling into your lungs. Most devices have volume markings in milliliters along the side so you can see exactly how much air you took in with each breath. A small indicator on the side of the device also tells you whether you’re breathing in at the right speed. Breathing too fast is a common mistake, because it inflates only the upper parts of your lungs. Slow, steady inhalation is what gets air deep into the lower lobes where fluid tends to collect.
Why It’s Used After Surgery
Surgery, especially on the chest or abdomen, makes deep breathing painful. Your natural instinct is to take short, shallow breaths to avoid discomfort. The problem is that shallow breathing leaves portions of your lungs underinflated, and those collapsed areas quickly become breeding grounds for bacteria. Pneumonia is one of the most common complications after major surgery for exactly this reason.
An incentive spirometer gives you a concrete goal to work toward, turning deep breathing from an abstract instruction into something measurable. After open heart surgery, abdominal procedures, or any operation that limits your mobility, the device helps you maintain lung function during the days or weeks when you’re spending most of your time in bed. It also helps restore normal oxygen levels, which often drop after surgery or serious illness.
Conditions Beyond Surgery
The device isn’t limited to post-operative care. It’s regularly used for several other situations:
- Pneumonia: When air sacs fill with mucus and fluid, an incentive spirometer helps loosen that buildup so you can cough it out more effectively.
- COPD: The lung damage from COPD is permanent, but regular use of the device can help manage symptoms by exercising the remaining healthy lung tissue.
- Cystic fibrosis: Mucus buildup is a constant challenge, and the deep breathing exercises help keep airways as clear as possible.
- Rib injuries: A cracked or bruised rib makes every breath painful, so patients tend to breathe shallowly. The spirometer encourages them to push past that tendency in a controlled way.
How to Use One
Sit upright if you can, either on the edge of your bed or propped up with pillows. Holding the spirometer upright in front of you, exhale normally, then seal your lips tightly around the mouthpiece. Breathe in slowly and steadily, watching the piston rise. The goal is to inhale as deeply as you can while keeping the flow indicator in the correct zone, which tells you your speed is right.
Once you’ve inhaled as far as possible, hold your breath for about 3 to 5 seconds. This pause is important because it gives the air time to reach and open up the smallest airways deep in your lungs. Then remove the mouthpiece and exhale normally. After a set of breaths, cough gently. That cough is doing real work: it helps move loosened mucus up and out of your airways.
Most patients are asked to do about 10 breaths per session, repeating sessions every 1 to 2 hours while awake. Your provider will set a volume target based on your age, height, and condition, and that target typically increases as you recover. It’s normal for your first few sessions to feel difficult, especially if you’re dealing with surgical pain. The numbers will climb as your lungs regain strength.
Reading the Numbers
The volume markings on the chamber typically range from about 500 mL to 4,000 mL or higher. Where you start depends entirely on your baseline. A healthy adult might easily reach 2,500 mL or more, while someone fresh out of surgery might struggle to hit 1,000 mL. Neither number is “bad” on its own. What matters is the trend. Your provider will give you a target volume to aim for, and you should see gradual improvement over days of consistent use.
If your numbers plateau or drop, that can signal a problem worth mentioning to your care team, such as worsening fluid in the lungs or an emerging infection. But for most people, steady practice leads to steady improvement, and the visual feedback of watching that piston climb higher each day is surprisingly motivating during a recovery that can otherwise feel slow.
Getting the Most Out of It
The biggest mistake people make is treating the spirometer like a one-time exercise rather than a recurring habit throughout the day. Doing 10 perfect breaths once in the morning and then ignoring it doesn’t provide the same benefit as shorter sessions spread across your waking hours. Consistency matters more than any single impressive number.
The second most common error is breathing in too quickly. A fast, sharp inhale will shoot the piston up, but it only fills the large central airways. Slow inhalation is what generates the sustained negative pressure that pulls open the smaller, deeper air sacs. Think of it less like gasping and more like a long, controlled yawn.
If you’re using the device at home after discharge, keep it within arm’s reach so you remember to use it. Incentive spirometers are single-patient devices, meaning they’re meant for one person only and shouldn’t be shared. Rinse the mouthpiece with warm water regularly and let it air dry to keep it clean. The device itself doesn’t need batteries or refills, and most are disposable once your recovery is complete.