You should also read Deceptions of the Douglas Bag Validation Method
in Dr. Andrew's Corner.
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The following components are required:
- Gas Analyzers
O2 Analyzer: See our
CO2 Analyzer: See our 17630
If you are using brand "X" gas analyzer you may also need our model 17503 Pump/Flow Controller, our own gas analyzers have a built-in pump.
If you need a drying column for your gas analyzer Click here
- How to measure volume:
a. Dry Gas Meter # 17150
b. Model 17125 or 17130 Turbine Volume Meter, the best choice because it may later be incorported into a computerized metabolic measurement system, or
c. A Calibration Syringe to evacuate the gas collection bag in measured increments. We suggest the 7-liter size because if you test an athlete with 120 liter minute ventilation and you have a 1-liter syringe, it will take 120 strokes to evacuate the bag. Think about it!
If you choose the syringe method you will need the stopcock in (4) below.
- A Patient Interface
mouthpiece , noseclip and
breathing valve or
a more comfortable Air Cushion Mask.
If you choose a mouthpiece and noseclip, we suggest you use the R2700B valve with saliva trap and either the R2726 or R2766 Head Support.
If you choose a face mask, we suggest you use the R2700 valve with the number KM295A mask starter kit.
- Gas Collection bags and related accessories
This usually means so-called "Douglas Bags", we suggest the 200 liter size for use in exercise.
Each bag will need a number K-5311 closing valve.
To prevent damage to the bag, they should be suspended. Either rig a suspension wire in your lab or consider our number 1195-R Suspension Rack.
Each rack can hold 3 filled bags.
In addition to the closing valve, you need a manual
stopcock. We suggest number R2100C. The purpose of the stopcock is two-fold:
a. To switch the test subject from exhaling into air to exhaling into the bag on command, and
b. To connect the evacuation syringe alternately to the bag and to air.
- Barometric Pressure, Humidity & Temperature.
Required for BTPS, ATPD, ATPS and STPD corrections.
(We have the formulas if you need them)
Last Updated: 31 Dec 2018
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