What's the plural form of thrombocytopaenia? Here's the word you're looking for.
Answer
The noun thrombocytopaenia can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be thrombocytopaenia.
However, in more specific contexts, the plural form can also be thrombocytopaenias e.g. in reference to various types of thrombocytopaenias
or a collection of thrombocytopaenias.