1. 
   BTPS
   Symbol indicating that a gas volume has been expressed as if it were saturated with water vapor at body temperature (37°C) and at the ambient barometric pressure; used for measurements of lung volumes. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?BTPS
   
   
2. 
   BTPS
   body temperature and pressure, saturated; denoting a volume of gas saturated with water vapor at 37° C and ambient barometric pressure.
   Found op http://www.encyclo.co.uk/local/21001
   
   
3. 
   BTPS
   Type: Symbol Definitions: 1. Symbol indicating that a gas volume has been expressed as if it were saturated with water vapor at body temperature (37°C) and at the ambient barometric pressure; used for measurements of lung volumes.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=12604
   
   
4. 
   btps
   1) Without ... (unprotected)
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/btps/1
   
   

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