ʻO ka pahu ʻike vitamin D (colloidal gold) he kūpono ia no ka ʻike semi-quantitative o ka vitamina D i loko o ke koko venous kanaka, serum, plasma a i ʻole ke koko peripheral, a hiki ke hoʻohana ʻia e nānā i nā maʻi no ka hemahema o ka vitamin D.