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