Antiphospholipid syndrome is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Antiphospholipid syndrome, or a subtype of Antiphospholipid syndrome, affects less than 200,000 people in the US population.
Ophanet, who are a consortium of European partners, currently defines a condition rare when if affects 1 person per 2,000. They list Antiphospholipid syndrome as a "rare disease". More information about Antiphospholipid syndrome is available from Orphanet
The term 'prevalence' of Antiphospholipid syndrome usually refers to the estimated population of people who are managing Antiphospholipid syndrome at any given time. The term 'incidence' of Antiphospholipid syndrome refers to the annual diagnosis rate, or the number of new cases of Antiphospholipid syndrome diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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