By pulseoxymeter, every 4 hr, below 93%

Before placing your finger inside the oximeter, remove nail polish, false nails etc., and warm your hand by rubbing against each other, if it's cold. > Before taking the measurement, one should rest for at least five minutes. > Rest your hand on your chest at heart level and hold it still. > Then switch on the oximeter and place it on either the middle or the index finger. The reading may fluctuate. Wait for it to be stable. Keep the oximeter in place for at least a minute or longer if the reading is not stable. > Record the highest result once it has not changed for five seconds. > Identify each recording carefully. > Start recording from baseline and record three times a day at the same time.

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You can use a portable device called - PULSE OXYMETER Interval time - 4-6 hourly Alarming levels ( normal individual ) - below 93% It is called oxygen saturation levels which is displayed on the pulse oxymeter

94 percentage and above is normal. You can check it with pulse oximeter keeping it on the finger, if the spo2 reading is dropping below 93 percentage it is alarming.