Spirometer / Pulse Oximeter FAQs
If I blow air down the tube, how do I clean the SpiroCard?
Air doesn't go down the tube, only pressure travels through the tube. There is a static pressure column created between the end of the mouthpiece and the pressure transducer inside the SpiroCard. The patient's exhalation follows the path of least resistance, the vents on the side of the mouthpiece, thereby preventing moisture from entering the pressure tube.
To illustrate take a pressure tube that can be discarded. Attach the pressure tube to the mouthpiece and cover the opposite end of the pressure tube with your finger. Breathe through the mouthpiece. Notice the lack of moisture in the pressure tube behind the mouthpiece. Now remove your finger from the end of the pressure tube and repeat. Moisture will be present.
This demonstrates that if used properly the pressure tube will not become contaminated. If a patient covers the vents on the mouthpiece or uses the pressure tube when it is not properly connected to the spirometer, the pressure tube must be replaced.
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When do I need to replace the Pressure Tube?
The pressure tube can be reused on different patients. QRS suggests replacing the pressure tube if condensation forms in the tube or if the tube is kinked or becomes occluded. If a patient covers the vents on the mouthpiece or uses the pressure tube when it is not properly connected to the spirometer, then the pressure tube must be replaced.
Store the pressure tube in a cool dry place to avoid condensation forming in the tube.
How many times can I use the mouthpiece?
Mouthpieces are single patient use only but can be used up to 20 times over a 10 day period for that patient, if the fabric does not become contaminated. The patient should open, handle and dispose of his/her own mouthpiece and should return it to its plastic bag to avoid contamination if future use is anticipated. Never use the same mouthpiece on different patients.
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How does the mouthpiece handle cross-contamination?
Mouthpieces are single patient use only. The patient should open, handle and dispose of his/her own mouthpiece and should return it to its plastic bag to avoid contamination if future use is anticipated. Never use the same mouthpiece on different patients! 
Mouthpiece construction and cross-contamination.
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Do we have to calibrate the spirometer/how often does it need to be calibrated?
The QRS product line of spirometers are pre-calibrated as are the mouthpieces. QRS spirometers do not require calibration, however, the software does allow for calibration checks in the field with the use of a 3-liter syringe. If you believe your device is out of calibration after testing several mouthpieces, please contact QRS Technical Support.
QRS calibration process and why our spirometers do not require calibration.
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How is the lung age calculated?
Lung age is equal to the predicted FEV1 that matches the patient's actual FEV1. Lung age is calculated for patients between 20-84 years old. If anyone falls out side this age range then the Lung Age will not be calculated. Also if anyone's calculated Lung Age falls out side of 20-84yrs old then a Lung Age will not be displayed by the software. Note - lung age may differ based on the predicted equation chosen. Reference: Morris JF, Temple W.; Spirometric "lung age" estimation for motivating smoking cessation. Prev Med. 1985 Sep: 14)5):655-62. Age Range: 20-84.
Lung Age calculations.
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What sensors can I use with my OxiCard (CF Version)?
QRS includes the 210 Adult Finger Clip Sensor with the OxiCard (CF version). This sensor can be used on both Adults and Pediatrics > 30 kg. Customers that wish to purchase a different type of sensor, such as a Neonate sensor, can do so by visiting http://www.dolphinmedical.com/dolphinone.htm. Note - only the Dolphin One product line of sensors will work with the QRS OxiCard.
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What Operating System does my hardware run on?
Your hardware relies on drivers that ship with the Office Medic software.
Which Operating Systems are supported by my version of Office Medic?Back to Top