De or het cholesterolbepaling?

The correct Dutch article is:

de cholesterolbepaling

Rule Words ending in -ing: almost always de. See the rule

How to use cholesterolbepaling

the cholesterolbepalingde cholesterolbepaling
this cholesterolbepalingdeze cholesterolbepaling
that cholesterolbepalingdie cholesterolbepaling
our cholesterolbepalingonze cholesterolbepaling
your cholesterolbepalingjouw cholesterolbepaling
every cholesterolbepalingelke cholesterolbepaling
which cholesterolbepaling?welke cholesterolbepaling?
a big cholesterolbepaling / the big cholesterolbepalingeen grote cholesterolbepaling, de grote cholesterolbepaling