B737 FA'S REPORT USING ONE AND A HALF PORTABLE OXYGEN BOTTLES ON A SICK PAX MUCH TO THE CAPT'S CHAGRIN. CAPT BELIEVES SECOND BOTTLE IS FOR FA USE DURING CABIN DECOMPRESSION.

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'D' FLT ATTENDANT WENT TO EXIT ROW TO CHK ON FEMALE PAX WHO WAS LOSING CONSCIOUSNESS AND FEELING NAUSEOUS. MEDICAL OXYGEN PORTABLE OXYGEN BOTTLE WAS ADMINISTERED TO THE PAX; FLT ATTENDANTS PAGED FOR MEDICAL HELP; AND F/D WAS NOTIFIED. MEDICAL COMPANY WAS CONTACTED; DOCTOR ATTENDED PATIENT; AND PAX WAS MOVED TO A DIFFERENT ROW. AFTER MEDICAL PORTABLE OXYGEN BOTTLE WAS DEPLETED; A SECOND PORTABLE OXYGEN BOTTLE WAS ATTACHED AND FLT ATTENDANTS CONTINUED MONITORING THE PAX. FLT ATTENDANTS GAVE THE FD THE CABIN DISCREPANCY RPT SAYING THAT 2 THERAPEUTIC PORTABLE OXYGEN BOTTLES WERE USED. THE CAPT INFORMED FLT ATTENDANTS THAT HE SHOULD HAVE BEEN NOTIFIED PRIOR TO THE SECOND PORTABLE OXYGEN BOTTLE BEING ADMINISTERED; AND THAT OUR SECOND PORTABLE OXYGEN BOTTLE WAS A DECOMPRESSION; AND NOT A THERAPEUTIC PORTABLE OXYGEN BOTTLE. DECOMPRESSION OXYGEN (SECOND PORTABLE OXYGEN BOTTLE) WENT BELOW 1500 PSI DURING FLT. A BRIEFING WITH THE FLT ATTENDANTS; AN ONBOARD FAA INSPECTOR; AND THEN WITH THE CAPT AND FO FOLLOWED.