Definition:
The reactions assessed are isolated febrile type (not associated with other specific reaction categories), allergic and hypotensive reactions occurring up to 24 hours following a transfusion of blood or components, for which no other obvious cause is evident.
SHOT has collected data on febrile, allergic and hypotensive reactions (FAHR) since 1996. Originally, this category was called acute transfusion reactions (ATR).
Since 2012 SHOT has excluded ‘mild reactions’, and now only collects data on moderate or severe reactions according to the International Society for Blood Transfusion/International Haemovigilance Network (ISBT/IHN) definitions.
Recent Recommendations
Give appropriate targeted treatment and if needed, preventative cover for future transfusion
Haematology registrars should receive training in classification, appropriate investigation and management of transfusion reactions in the laboratory induction at the start of their programme
Action: Hospital transfusion teams, Haematology training programme directors
FAHR Resources

FAHR Annual Report Chapters
Febrile Allergic and Hypotensive Reactions (FAHR) 2023
Febrile Allergic and Hypotensive Reactions (FAHR) 2022
Febrile Allergic and Hypotensive Reactions (FAHR) 2021
Febrile Allergic and Hypotensive Reactions (FAHR) 2020
Febrile Allergic and Hypotensive Reactions (FAHR) 2019
Febrile Allergic and Hypotensive Reactions (FAHR) 2018
Febrile Allergic and Hypotensive Reactions (FAHR) 2017
Acute Transfusion Reactions Allergic Hypotensive and Severe Febrile (ATR) 2016
Acute Transfusion Reactions Allergic Hypotensive and Severe Febrile (ATR) 2015
Acute Transfusion Reactions (ATR) 2014
Acute Transfusion Reactions (ATR) 2013
Acute Transfusion Reactions (ATR) 2012
Acute Transfusion Reactions (ATR) 2011
Acute Transfusion Reactions (ATR) 2010
Acute Transfusion Reactions (ATR) 2009
Acute Transfusion Reactions (ATR) 2008
Acute Transfusion Reactions (ATR) 2007
Acute Transfusion Reactions (ATR) 2006
Acute Transfusion Reactions (ATR) 2005
Acute Transfusion Reactions (ATR) 2004
Acute Transfusion Reactions (ATR) 2003
Acute Transfusion Reactions (ATR) 2001-02
Acute Transfusion Reactions (ATR) 2000-01
Acute Transfusion Reactions (ATR) 1999-00
Acute Transfusion Reactions (ATR) 1998-99
Acute Transfusion Reactions (ATR) 1997-98