Essential thrombocythaemia
Meaning of essential thrombocythaemia: For the purposes of this Statement of Principles, essential thrombocythaemia: (a) means a chronic, Philadelphia-chromosome negative myeloproliferative neoplasm characterised by bone marrow megakaryocytic proliferation, resulting in excessive, clonal platelet production and marked thrombocytosis in peripheral blood; and (b) excludes secondary or reactive thrombocytosis.
Reasonable Hypothesis (RH) — Statement of Principles No. 91 of 2021
At least one of the following factors must as a minimum exist before it can be said that a reasonable hypothesis has been raised connecting essential thrombocythaemia or death from essential thrombocythaemia with the circumstances of a person's relevant service:
- (1)having smoked tobacco products: (a) in an amount of at least 10 pack-years before the clinical onset of essential thrombocythaemia; and (b) commencing at least 5 years before the clinical onset of essential thrombocythaemia; and if smoking has ceased before the clinical onset of essential thrombocythaemia, then that onset occurred within 15 years of cessation;
Note: one pack-year is defined in the Schedule 1 - Dictionary.
- (2)inability to obtain appropriate clinical management for essential thrombocythaemia;
Aggravation-only factors: the factors in subsection 9(2) apply only to material contribution to, or aggravation of, the condition where it was suffered or contracted before or during (but did not arise out of) the person’s relevant service.
Balance of Probabilities (BoP) — Statement of Principles No. 92 of 2021
2 factors
At least one of the following factors must exist before it can be said that, on the balance of probabilities, essential thrombocythaemia or death from essential thrombocythaemia is connected with the circumstances of a person's relevant service:
- (1)having smoked tobacco products: (a) in an amount of at least 10 pack-years before the clinical onset of essential thrombocythaemia; and (b) commencing at least 5 years before the clinical onset of essential thrombocythaemia; and if smoking has ceased before the clinical onset of essential thrombocythaemia, then that onset occurred within 15 years of cessation;
Note: one pack-year is defined in the Schedule 1 - Dictionary.
- (2)inability to obtain appropriate clinical management for essential thrombocythaemia;
Aggravation-only factors: the factors in subsection 9(2) apply only to material contribution to, or aggravation of, the condition where it was suffered or contracted before or during (but did not arise out of) the person’s relevant service.
