Narrative:

Approximately 15-20 minutes into our flight; first officer informed the captain that he wasn't feeling well and he needed to go to the lavatory. He was gone roughly 15 minutes and returned. He was sweating profusely and complained of abdominal discomfort. He then proceeded to head back to the lavatory a second time and never returned to the flight deck. The captain asked that I remove myself from the pilot jump seat and sit in the first officer's chair until he returned to his station; if able. Roughly an hour from touchdown it was clear that the first officer would remain in the cabin. Captain then [used] emergency authority and asked that I act as the pilot not flying (PNF). I agreed to his request and the remainder of the flight was uneventful. Emt's met us at the gate to assist the first officer.nothing I could have done to prevent the first officer from becoming ill. I thought the captain did a nice job addressing the situation. We could have contacted medical early on. However; we didn't have a clear understanding of the severity of the situation until much later into the flight. The first officer indicated abdominal issues; which we interpreted as a 'sour stomach.' nonetheless; next time I'll certainly get medical involved early on. I acted as the PNF once the captain exercised emergency authority and asked that I assist.

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Original NASA ASRS Text

Title: A321 flight crew reported the First Officer became ill and was unable to resume his duties.

Narrative: Approximately 15-20 minutes into our flight; First Officer informed the Captain that he wasn't feeling well and he needed to go to the lavatory. He was gone roughly 15 minutes and returned. He was sweating profusely and complained of abdominal discomfort. He then proceeded to head back to the lavatory a second time and never returned to the flight deck. The Captain asked that I remove myself from the pilot jump seat and sit in the First Officer's chair until he returned to his station; if able. Roughly an hour from touchdown it was clear that the First Officer would remain in the cabin. Captain then [used] emergency authority and asked that I act as the Pilot Not Flying (PNF). I agreed to his request and the remainder of the flight was uneventful. EMT's met us at the gate to assist the First Officer.Nothing I could have done to prevent the First Officer from becoming ill. I thought the Captain did a nice job addressing the situation. We could have contacted medical early on. However; we didn't have a clear understanding of the severity of the situation until much later into the flight. The First Officer indicated abdominal issues; which we interpreted as a 'sour stomach.' Nonetheless; next time I'll certainly get medical involved early on. I acted as the PNF once the Captain exercised emergency authority and asked that I assist.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.