Transfusion Triggers

The Blood Transfusion department in Peterborough uses the national guidelines for the use of transfusion triggers. Below are listed explanations of the transfusion trigger codes and the rationale for introducing the system.
The appropriate code should be used when making your blood transfusion request. The code will then be available within the laboratory for audit purposes.
TRANSFUSION CODES - RED CELL CONCENTRATES |
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CODE |
EXPLANATION |
INDICATION |
R1 |
Acute Bleeding |
• Patients with acute blood loss and haemodynamic instability. |
R2 |
Hb ≤70g/L stable patient |
• Use an Hb threshold of 70g/L and a target Hb of 70-90g/L to guide red cell transfusion. |
R3 |
Hb ≤80g/L if cardiovascular disease |
• Use an Hb threshold of 80g/L and a target Hb of 80-100g/L to guide red cell transfusion. |
R4 |
Chronic transfusion dependent |
• Transfuse to maintain an Hb which prevents symptoms. Suggest an Hb threshold of 80g/L initially and adjust as required. |
R5 |
Radiotherapy maintain Hb |
• There is some evidence for maintaining an Hb of 100g/L in patients receiving radiotherapy for cervical and possibly other tumours. |
R6 |
Exchange Transfusion |
• Code only to be used for exchange transfusions. |
TRANSFUSION CODES - FFP (15ml/kg) |
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CODE |
EXPLANATION |
INDICATION |
F1 |
Major Haemorrhage |
Early use in trauma – 1 unit FFP: 1 unit red cells. Other settings at least 1 unit FFP: 2 units red cells. Once bleeding controlled, use thresholds below. |
F2 |
PT Ratio/INR >1.5 with bleeding |
Without major haemorrhage. Keep PT/APTT ratio of <1.5. |
F3 |
PT Ratio/INR >1.5 and pre-procedure |
e.g. Disseminated Intravascular Coagulation (DIC) with risk of significant bleeding. |
F4 |
Liver disease with PT ratio/INR >2 and pre-procedure |
Not usually required if no bleeding or before invasive procedure if PT ratio/INR is <2. |
F5 |
TTP/plasma exchange |
|
F6 |
Replacement of single coagulation factor |
Where factor concentrate unavailable. |
TRANSFUSION CODES - PROTHROMBIN COMPLEX CONCENTRATE (i.e. Octaplex®) |
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PCC1 |
Emergency reversal of VKA |
For severe bleeding or head injury with suspected intracerebral haemorrhage |
PCC2 |
Emergency reversal of VKA for pre-emergency surgery |
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TRANSFUSION CODES - CRYOPRECIPITATE (2 pooled units for adult) Use with FFP unless isolated fibrinogen deficiency |
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CODE |
EXPLANATION |
INDICATION |
C1 |
Clinically significant bleeding and fibrinogen <1.5g/L (<2g/L in obstetric bleeding) |
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C2 |
Fibrinogen <1g/L and pre-procedure |
With risk of bleeding |
C3 |
Bleeding associated with thrombolytic therapy |
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C4 |
Inherited hypofibrinogenaemia |
When fibrinogen concentrate not available. |
TRANSFUSION CODES - PLATELET CONCENTRATE (1 unit = 1 adult therapeutic dose or ATD) |
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CODE |
EXPLANATION |
INDICATION |
PROPHYLACTIC PLATELET TRANSFUSION |
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P1 |
Plt <10 x 109/L, reversible bone marrow failure |
Not indicated in chronic bone marrow failure if not on intensive treatment, and not bleeding |
P2 |
Plt 10-20 x 109/L, sepsis/haemostatic abnormality |
Or other additional risk factor for bleeding |
PRIOR TO INVASIVE PROCEDURE OR SURGERY - to prevent bleeding associated with invasive procedures |
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P3a |
Plt <20 x 109/L, central venous line |
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P3b |
Plt <40 x 109/L, pre lumbar puncture/spinal anaesthaesia |
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P3c |
Plt <50 x 109/L, pre liver biopsy/major surgery |
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P3d |
Plt <80 x 109/L, epidural anaesthaesia |
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P3e |
Plt <100 x 109/L, pre critical site surgery |
e.g. CNS / eye. Transfusion prior to bone marrow biopsy not required. |
THERAPEUTIC USE TO TREAT BLEEDING (WHO BLEEDING GRADE ≥2) |
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P4a |
Major haemorrhage, Plt <50 x 109/L |
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P4b
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Empirically in a Major Haemorrhage Pack / Protocol |
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P4c |
Critical site bleeding, Plt <100 x 109/L |
e.g. CNS. |
P4d |
Clinically significant bleeding, Plt <30 x 109/L |
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SPECIFIC CLINICAL CONDITIONS |
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P5a |
DIC pre procedure or if bleeding |
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P5b |
Primary immune thrombocytopaenia (emergency pre-procedure/severe bleeding) |
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PLATELET DYSFUNCTION |
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P6a |
Consider if critical bleeding on anti-platelet agent |
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P6b |
Inherited platelet disorders directed by haemostasis specialist |
The indications for transfusion above are taken from UK national guidelines for the use of blood components (see references). Although it is accepted that clinical judgment plays an essential part in the decision to transfuse or not, the purpose of drawing available transfusion guidelines together into one short document is to help clinicians decide when blood transfusion is appropriate, and to minimise unnecessary exposure to transfusion.
Each indication has been assigned a number, which may be used by clinicians when requesting blood or for purposes of audit. Specific details regarding the patient’s diagnosis and any relevant procedures to be undertaken should also be provided.
These are current guidelines (updated Janaury 2020) and may change depending on new evidence.
References
https://nationalbloodtransfusion.co.uk/transfusion-training-hub/national...- Select "27632 Indication Codes for Transfusion - An Audit Tool (windows.net)" link