Transfusion Triggers

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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

 CODE

 EXPLANATION

INDICATION

R1

Acute Bleeding

• Patients with acute blood loss and haemodynamic instability.
• Decisions about the use of red cell transfusion in acute blood loss situations should be made by
experienced clinicians.
• Hb may be unreliable.
• When normovolaemic use Hb thresholds below

R2

Hb ≤70g/L stable patient
Acute anaemia

• Use an Hb threshold of 70g/L and a target Hb of 70-90g/L to guide red cell transfusion.
• Follow local protocol for indications such as post
cardiac surgery, traumatic brain injury, acute cerebral ischaemia

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
anaemia

• Transfuse to maintain an Hb which prevents symptoms. Suggest an Hb threshold of 80g/L initially and adjust as required.
• Haemoglobinopathy patients require individualised Hb thresholds depending on age and diagnosis.

R5

Radiotherapy maintain Hb
≥100g/L

• 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)

 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®)

PCC1

Emergency reversal of VKA

For severe bleeding or head injury with suspected intracerebral haemorrhage

 

PCC2

Emergency reversal of VKA for pre-emergency surgery

 

TRANSFUSION CODES - CRYOPRECIPITATE (2 pooled units for adult) Use with FFP unless isolated fibrinogen deficiency

 CODE

 EXPLANATION

INDICATION

C1

Clinically significant bleeding and fibrinogen <1.5g/L (<2g/L in obstetric bleeding)

 

 

C2

Fibrinogen <1g/L and pre-procedure

 

 With risk of bleeding

C3

Bleeding associated with thrombolytic therapy

 

C4

Inherited hypofibrinogenaemia

When fibrinogen concentrate not available.

TRANSFUSION CODES - PLATELET CONCENTRATE (1 unit = 1 adult therapeutic dose or ATD)

 CODE

 EXPLANATION

INDICATION

PROPHYLACTIC PLATELET TRANSFUSION

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

P3a

Plt <20 x 109/L, central venous line

 

P3b

Plt <40 x 109/L, pre lumbar puncture/spinal anaesthaesia

 

P3c

Plt <50 x 109/L, pre liver biopsy/major surgery

 

P3d

Plt <80 x 109/L, epidural anaesthaesia

 

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)

P4a

Major haemorrhage, Plt <50 x 109/L

 

P4b

 

Empirically in a Major Haemorrhage Pack / Protocol

 

P4c

Critical site bleeding, Plt <100 x 109/L

e.g. CNS.

P4d

Clinically significant bleeding, Plt <30 x 109/L

 

SPECIFIC CLINICAL CONDITIONS

P5a

DIC pre procedure or if bleeding

 

P5b

Primary immune thrombocytopaenia (emergency pre-procedure/severe bleeding)

 

PLATELET DYSFUNCTION

P6a

Consider if critical bleeding on anti-platelet agent

 

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