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Table 2 Application of risk analysis (severity score against occurrence and detection) in blood transfusion process (Risk matrix*: O – D - S)

From: Preventing blood transfusion failures: FMEA, an effective assessment method

Sa

1

2

3

4

5

Ob Ă— Dc

5

5

10

15

20

25

10

10

20

30

40

50

15

15

30

45

60

75

20

20

40

60

80

100

25

25

50

75

100

125

  1. The RPN or Risk matrix is calculated by multiplying the severitya (S), occurrenceb (O), and detectabilityc (D) of the hazard. For example, a hazard that has “major severity” (rate 5), that occurs “often” (rate 4), and that has a “low probability of detection” (rate 4) has an RPN of 5 × 4 × 4 = 80
  2. Score more than 80 = emergency for intervention (eliminated)
  3. Score 40–75 = urgent for intervention (programing & controlled)
  4. Score 20–30 = need to program (programing & controlled)
  5. Score less than 20= need to monitor (accepted)