What should be your normal blood oxygen level?
Different methods are used, to measure the blood oxygen levels. Blood testing and pulse-oximeter monitoring, are the common means to estimate oxygen saturation levels. Oxygen saturation (SpO2) that is the amount of oxygen in the blood for adults, should be 95% to 100%. A SpO2 level below 90% is known as ‘hypoxemia’. For patients who have chronic lung conditions and other breathing problems, the normal SpO2 range of 95% to 100% does not apply. Such individuals should consult with their doctors, to determine the acceptable oxygen levels for their unique state of health. If the blood oxygen saturation level is below 80%, then, it may impair the functioning of the heart and brain, which could lead to respiratory failure or cardiac arrest.
Oxygen concentrators are meant to provide oxygen for patients with chronic obstructive pulmonary disease (COPD) and in higher concentrations, for chronic hypoxemia and pulmonary edema.
However, not all COVID-19 patients need oxygen, points out Dr. Nikhil Kulkarni, consultant – internal medicine, Fortis Raheja, Mumbai. “Some COVID-19 patients experience shortness of breath and oxygen deprivation. Patients with fluctuating oxygen levels may require hospitalization. The SARS-COV-2 virus can cause inflammation in the lungs that impacts the supply of oxygenated blood in the body. In such cases, the use of oxygen concentrators can raise the oxygen level,” Kulkarni explains.
What is an oxygen concentrator?
Air is made up of 78% nitrogen and 21% oxygen. An oxygen concentrator works by absorbing the oxygen from the air and filtering out the nitrogen. It concentrates the oxygen, which is then dispensed through a pressure valve that regulates the flow to the nasal cannula. An oxygen concentrator cuts down the need for constant refilling, as it draws oxygen from the surrounding air.
Should you buy or rent an oxygen concentrator for your home?
Although blood oxygen levels below 90% are considered as concerning, experts maintain that not all cases of oxygen imbalance require intensive care support or hospitalization. Mild cases can be managed with oxygen concentrators, under proper guidance from a doctor, especially at a time when securing hospital access is difficult. Nevertheless, an oxygen concentrator is also no substitute for situations where hospitalization is necessary.
“An oxygen concentrator is prescribed as a temporary respite or stop-gap till hospitalisation or to aid recovery at home for patients with low oxygen, depending on the patients’ health. Use of oxygen therapy at home can help raise oxygen levels. It is compulsory to have a doctor’s approval to use the device and should be used only as advised. An oxygen concentrator can help in those critical hours, between oxygen levels dropping and the patient being admitted to the hospital. A doctor’s guidance is needed on how much oxygen has to be given, as oxygen toxicity can have adverse effects,” cautions Kulkarni.
What is the difference between an oxygen concentrator and an oxygen cylinder?
Oxygen concentrators can serve as alternatives to cylinders in some cases but they can only supply five to 10 liters of oxygen per minute. Critical patients may need 40-50 liters of oxygen per minute. Concentrators are moveable and need no special temperature to operate. While oxygen cylinders can run out of oxygen and need to be refilled, a concentrator will never run out of oxygen, as long as a power supply for the unit is available. Oxygen concentrators can produce oxygen 24 hours and last five years or more.
Experts are of the opinion that the 90%-95% pure oxygen generated by oxygen concentrators, is good enough for mild and moderate COVID-19 patients with oxygen saturation levels above 85%. However, this oxygen is not advisable for ICU patients, who need 99% Liquid Medical Oxygen (LMO).
Oxygen concentrator price
Oxygen concentrators are available in various sizes, models, styles, and brands. Oxygen concentrators cost around Rs 40,000 to Rs three lakhs and more, whereas cylinders are priced between Rs 8,000 and Rs 20,000. Concentrators are usually a one-time investment, besides the electricity/battery and maintenance that it may need. In India, oxygen concentrators are imported from China, Taiwan, and the USA. The two leading manufacturers of domestic-use oxygen concentrators in the country are BPL Medical Technologies and Philips.
The demand for oxygen concentrators is high in India now, due to the surge in COVID-19 cases. Consequently, there is a shortage of oxygen concentrators and there are cases of panic hoarding and black marketing. If one is unable to buy, then, one can also opt for an oxygen concentrator for rent.
How to choose an oxygen concentrator based on flow rate
When buying an oxygen concentrator, always check the ‘flow rate’ capacity. The oxygen concentrator must be used, based on the doctor’s prescription – the doctor will recommend the flow requirement in liters per minute (LPM), based on the patient’s condition and how much supplemental oxygen therapy is needed. Some oxygen concentrators may have flow rates in the range of 250 to 750 milliliters per minute, while others may offer flow rates in the range of two to 10 liters per minute. It is advisable to opt for a unit that has more capacity than necessary – for example, if one needs 3.5 LPM, then, choose an oxygen concentrator with a 5 LPM flow rate.
Portable oxygen concentrator
There are mainly two types of oxygen concentrators – large stationary ones, which cannot be moved around and are made to supply more oxygen, and small oxygen concentrators, which can be transported during traveling and for outdoor use. Portable oxygen concentrators typically weigh between two and four kgs and come with pulse flow and continuous flow modes, depending on one’s need and doctor’s advice. Pulse flow portable oxygen concentrators supply oxygen only when the patient inhales. Continuous flow oxygen concentrators supply oxygen at a constant rate, regardless of the patient’s breathing.
How much power does an oxygen concentrator need?
It is better to opt for a concentrator that has the lowest power consumption. There are various models that also work on batteries. The battery time varies per product. Also, continuous flow oxygen concentrators have a shorter battery life than pulse flow oxygen concentrators, because they put out more oxygen.
Oxygen concentrator operating noise level
All oxygen concentrators make noise but due to progress in technology, the products have become quieter. One should ideally opt for models where the sound levels range from 31 to 60 decibels.
Additional tips for buying an oxygen concentrator
- An oxygen concentrator can only be used under a doctor’s prescription and under medical supervision. It is not to be considered as a treatment for COVID-19.
- If the power supply is an issue, then, also buy a standby generator, a solar power inverter, or a backup battery and voltage stabilizer, to keep it safe during power fluctuations.
- Always choose a reputed brand and one which offers a warranty.
Safety tips for using oxygen concentrator at home
- Keep the oxygen concentrator at least 10 ft away from gas stoves. It should be placed in a well-ventilated area, away from sources of ignition.
- Never keep a matchbox, lighters, burnt candles or diffusers, near it.
- Do not smoke or let anyone smoke near the oxygen concentrator.
- Keep it at least two ft away from the walls and furniture when in use, to allow sufficient air intake.
- Avoid using anything flammable near the unit, including hand sanitizers and aerosol sprays, petroleum-based products like vaseline or air fresheners. Ensure that alcohol-based solutions and oil do not come into contact with oxygen supply devices.
- As the oxygen concentrator becomes hot when in use, keep it in a well-ventilated area, away from curtains.
- Avoid using an extension cord; use a proper electrical outlet.
- Keep the oxygen container upright and turn off the system when it is not being used.
- Always have a fire extinguisher nearby.
Oxygen concentrator in India
Philips Oxygen Concentrator
The Philips Respironics Everflo Oxygen Concentrator provides up to five liters of airflow which is up to 93%-96% pure and weighs 14 kgs.
BPL Oxy 5 Neo Oxygen
It provides up to five liters of oxygen supply with up to 93% oxygen purity level. It also has a built-in nebulizer, displays the operation time on LCD, and has a timer with turn-off the function.
Airsep New Life Elite Oxygen Concentrator
It provides up to five liters of a continuous flow of oxygen. It has a battery-powered alarm system that sounds in case of a power failure. It has an ‘Economy Mode’ for low power consumption.
Inogen One G5
It is a lightweight model which has smart Bluetooth connectivity and has six oxygen flow levels that can be adjusted as per the need. It has a battery run-time of up to 13 hours.
Dedakj DE-1S Oxygen Concentrator
It is lightweight and can provide up to six to eight liters of oxygen at up to 93% purity levels. It supports double oxygen absorption function, which enables two people to use it simultaneously.