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www.lung.org/lung-health-and-diseases/how-lungs-work/lung-capacity-and-aging.html

Forced vital capacity: the maximum amount of air you can forcibly exhale from your lungs after fully inhaling. It is about 80 percent of total capacity, or 3.8 liters, because some air remains in your lungs after you exhale. Forced vital capacity can decrease by about 0.2 liters per decade, even for healthy people who have never smoked.

lunginstitute.com/blog/lung-capacity-what-does-it-mean

While lung capacity refers to the maximum amount of air that your lungs are able to hold, lung function refers to how quickly you can inhale and exhale air from your lungs and also how effectively your lungs both oxygenate and remove carbon dioxide from your blood. Both lung capacity and lung function are affected by the various stages of COPD.

www.reference.com/health/normal-range-lung-capacity-41df60df76e20807

Lung capacity varies widely depending on a person’s age, sex, weight and activity level. Females have a 20 to 25 percent lower total lung capacity than males on average, and people who smoke also have much lower lung capacities, states The Physics Factbook.

www.healthtap.com/topics/60-percent-lung-capacity

Helpful, trusted answers from doctors: Dr. Munshower on 60 percent lung capacity: Iron panel sometimes is confusing, your panel number is one of them. Let me ask you why your iron panel was checked? If your lab originally showed anemia and this are supplementary test to see what is the reason for your anemia, i would say that you have very mild iron deficiency.

www.reddit.com/.../38hlbi/percentages_of_lung_capacity_used_during_various

A while ago I heard a statistic about what percentage of our lung capacity we use during various activities. I'm going to use ballpark numbers so I could be off by a good chunk, but this should give you guys an idea of what I'm looking for.

en.wikipedia.org/wiki/Lung_volumes

Lung volumes and lung capacities refer to the volume of air in the lungs at different phases of the respiratory cycle. The average total lung capacity of an adult human male is about 6 litres of air. Tidal breathing is normal, resting breathing; the tidal volume is the volume of air that is inhaled or exhaled in only a single such breath.

www.wisegeek.com/what-should-i-know-about-lung-capacity.htm

Total lung capacity refers to the maximum amount of air a person’s lungs can hold, about four to six liters (4000 to 6000 cm 3) for the average human.Only a third of this capacity is used during normal activity, but this fraction increases during strenuous activity when the body requires more oxygen.On average, males have a 20-25% higher capacity than females, and tall individuals have a ...

livehealthy.chron.com/lung-capacity-woman-9841.html

Forced Vital Capacity. Lung capacity is typically measured as forced vital capacity, or the maximum amount of air you can breathe out after a full inhalation. To test your forced vital capacity, your doctor will have you blow air into a device called a spirometer, which measures the volume of air you expel in liters.

healthunlocked.com/blf/posts/130081624/is-a-lung-function-test-of-70-good

If you have had a lung function test and your fev1 is 70% it would be classed as moderate however it's really on how you are feeling and what symptoms you have. If you have your sprimority results contact the a BLF nurse and go through your numbers.

www.worker-health.org/breathingtestresults.html

Understanding Your Breathing Test Results. There are many ways that a doctor can tell if your lungs are working properly. First, the doctor can do a physical exam using a stethoscope. The doctor will listen to hear if any of the “breath sounds” are abnormal.