Which of the following questions should be asked when investigating a transfusion reaction?

The Blood Bank laboratory needs to be informed of any suspected transfusion reaction as soon as possible.

Routine blood tests for Transfusion Reaction investigations;

  • 6ml EDTA (pink) for repeat cross match and group and screen
  • 6ml clotted sample for U&E’s, LFT’s, LDH, Haptoglobin
  • 4ml EDTA (purple) for Full Blood Count
  • 2.7ml citrate (blue) for coagulation screen

As well as the above samples, the following needs to be sent to the laboratory:

  1. Donor pack causing reaction including giving set
  2. All other units transfused in this episode
  3. Completed transfusion reaction form (liaise with Blood Bank / Transfusion Practitioner if unable to locate)
  4. Blood tests as outlined above, including blood cultures if infection is suspected

All reactions considered to be a result of transfusion, except minor allergic or febrile reactions, and without a history of comparable, non-serious reactions, must be investigated with a standard set of laboratory tests together with additional investigations based on the symptoms. The table below summarises the investigations to be completed according to the symptoms presented.

Symptoms Investigation
Fever (> 2oC rise or ≥ 39 oC), and or chills, rigors, myalgia, nausea or vomiting and/or loin pain Standard investigations: FBC, Coagulation screen, Renal and liver function tests, G&S for repeat compatibility testing and assessment of urine for Haemoglobin. Specific investigations: DAT, LDH and haptoglobin.Blood cultures from patient
Mucosal swelling (angiodema) Standard investigations: FBC, Coagulation screen Renal and liver function tests, G&S for repeat compatibility testing and assessment of urine for Haemoglobin. Specific investigations: Measure IgA lvel
Dyspnoea, wheeze or features of anaphylaxis Standard investigations: FBC, Coagulation screen Renal and liver function tests, G&S for repeat compatibility testing and assessment of urine for Haemoglobin. Specific investigations: Check O2 saturation's or blood gases, Chest x-ray
If severe or moderate allergy suspected, measure IgA level
If severe allergy/anaphylaxis suspected, consider measurement of serial mast cell tryptase (immediate, 3hr, 24hr)
Hypotension (isolated fall of ≥ 30mm resulting in level ≤ 80mm) As for fever. If severe or moderate allergy suspected, measure IgA level. If severe allergy/anaphylaxis suspected, consider measurement of serial mast cell tryptase (immediate, 3hr, 24hr)

Sample Requirements

EDTA tube - 4mL

Which of the following questions should be asked when investigating a transfusion reaction?

EDTA tube - 6mL

Which of the following questions should be asked when investigating a transfusion reaction?

Gold-top SST - 6mL

Which of the following questions should be asked when investigating a transfusion reaction?

Pulmonary Complications of Transfusion

Transfusion Associated Circulatory Overload (TACO), Transfusion Related Acute Lung Injury (TRALI) and Transfusion Associated Dyspnoea (TAD) contribute significantly to major morbidity after transfusion, and often these are potentially preventable. Early recognition and intervention / treatment is vital. The following video has been created by the SHOT team and provides an overview of pulmonary complications following blood component transfusion.

Watch Pulmonary Complications of Transfusion on YouTube.

Turnaround times

  • Preliminary report one working day
  • Full report one week

As soon as you suspect a transfusion reaction:

  1. Stop the transfusion immediately and activate emergency procedures if required. 
  2. Check and monitor the patient’s vital signs.
  3. Maintain intravenous (IV) access (do not flush the existing line and use a new IV line if required).
  4. Repeat all clerical and identity checks; ensure the right pack has been given to the right patient.
  5. Notify your Medical Officer and Transfusion Service Provider. 

After the transfusion has been stopped (except for some types of mild reaction), you may be required by the Transfusion Service Provider to send freshly collected blood and urine samples along with the component pack and IV line. Follow the relevant organisational occupational health and safety policies at all times (e.g. do not transport IV lines with the insertion spike (sharp end) exposed).

Document the reaction in the patient’s medical record and complete an incident report if required by local policies.

Common adverse reactions to blood products and guide to appropriate clinical action

Fever (≥38°C or rise ≥1°C) and/or chills, rigors
38°C to <39°C (no other symptoms)    
Possible etiology Action Investigation
Febrile non-haemolytic transfusion reaction (FHNTR) STOP transfusion. Exclude serious adverse events. Give anti-pyretic. 
Recommence cautiously if reaction subsides.
Reaction form to transfusion laboratory. Further investigations not usually required.
 
38°C to <39°C (no other symptoms)    
Possible etiology Action Investigation

Bacterial contamination or acute haemolytic transfusion reaction (AHTR)

May become a medical emergency

STOP transfusion. 
Check patient ID with label. IV antibiotics if septic. Maintain good urine output.

Sepsis work-up
Gram stain on blood product bag; blood
cultures on both patient and products.


Incompatible blood work-up
Group, screen and DAT on pre and
post-transfusion samples.


Haemolysis work-up
FBC, LDH, bilirubin, haptoglobin,
electrolytes, creatinine, urinalysis.


DIC work-up
Disseminated intravascular coagulation (DIC) may complicate a severe reaction – perform aPTT, PT, fibrinogen, D-Dimer (or FDP).

Rash or Urticaria (hives)
<2/3 body (no other symptoms)    
Possible etiology  Action Investigation
Minor allergic reactions STOP transfusion. Antihistamine. 
Recommence if reaction subsides.
None.
>2/3 body (no other symptoms)    
Possible etiology Action Investigation
Severe allergic reactions STOP transfusion. Antihistamine  
+/- corticosteroid.
None.
With dyspnoea, airway obstruction, hypotension (this is a medical emergency)    
Possible etiology Action Investigation
Anaphylaxis 
(consider IgA deficiency)
STOP transfusion. 
Initiate basic life support. 
Notify Lifeblood.
Check haptoglobin, tryptase and IgA levels. Test for anti-IgA if IgA deficient.
Dyspnoea, shortness of breath, decreased oxygen saturation
With/without hypertension, tachycardia    
Possible etiology Action Investigation
Transfusion associated circulatory overload (TACO) STOP transfusion. Assess chest X-ray for pulmonary oedema.  Diuretics. Oxygen. Sit patient upright. Check BNP/N-terminal pro-BNP.  Elevated levels are more common in TACO.
With/without hypotension    
Possible etiology Action Investigation

(Transfusion-related acute lung injury (TRALI)

May become a medical emergency

STOP transfusion. 
Assess chest X-ray for infiltrates. Oxygen. Possible intubation, ventilation. 
Notify Lifeblood
HLA and HNA typing and antibodies. 
TRALI is a clinical diagnosis – investigations to exclude other reactions.
Check BNP/N-terminal pro-BNP. Normal levels are more common in TRALI.

Bacterial contamination or acute haemolytic transfusion reaction (AHTR)

May become a medical emergency

STOP transfusion. 
IV antibiotics if sepsis. Check patient ID with label. Maintain good urine output. 
Notify Lifeblood

Sepsis work-up
Gram stain on blood product bag; blood
cultures on both patient and products.


Incompatible blood work-up
Group, screen and DAT on pre and
post-transfusion samples.


Haemolysis work-up
FBC, LDH, bilirubin, haptoglobin,
electrolytes, creatinine, urinalysis.

DIC work-up
Disseminated intravascular coagulation (DIC) may complicate a severe reaction – perform aPTT, PT, fibrinogen, D-Dimer (or FDP).

Note that this is a guide only. You must follow your hospital guidelines. Inform Lifeblood of any adverse reaction that may: 

  • relate to the quality of the product which will prompt Lifeblood to recall any associated products, e.g. transfusion transmissible infections, and TRALI; or
  • require an alternative product to be requested e.g. washed red cells in patients with repeated anaphylactic reactions or IgA deficient products. 

Clinical management must be tailored to the patient’s specific situation with the treating Medical Officer, Haematologist or Transfusion Service Provider.

Explore this topic further

How do you investigate transfusion reaction?

On discovery of a suspected transfusion reaction: Stop transfusion of blood product immediately where a suspected reaction has occurred and verify patient ID, ABO group of patient and donor unit immediately. Medical advice should be sought immediately from the patient's team and/or the haematology team.

What is the first step in the investigation of a transfusion reaction?

Terms in this set (101) What is the first step in the laboratory investigation of a transfusion reaction? C. Repeat ABO and Rh typing of patient and donor unit.

What are the signs of blood transfusion reaction?

The most common signs and symptoms include fever, chills, urticaria (hives), and itching. Some symptoms resolve with little or no treatment. However, respiratory distress, high fever, hypotension (low blood pressure), and red urine (hemoglobinuria) can indicate a more serious reaction.

Which of the following is the most common transfusion reaction?

Febrile non-hemolytic transfusion reactions are the most common reaction reported after a transfusion. FNHTR is characterized by fever or chills in the absence of hemolysis (breakdown of red blood cells) occurring in the patient during or up to 4 hours after a transfusion.