Hoʻohana maʻamau ʻia nā pahu V no ka mālama ʻana i nā laʻana a i ʻole nā mea hoʻonā a hoʻohana pinepine ʻia i nā laboratories analytical a biochemical. ʻO kēia ʻano vial kahi lalo me kahi ʻano V-like groove, hiki ke kōkua maikaʻi i ka hōʻiliʻili ʻana a me ka wehe ʻana i nā laʻana a i ʻole nā hopena. ʻO ka hoʻolālā V-lalo e kōkua i ka hōʻemi ʻana i nā koena a hoʻonui i ka ʻili o ka hopena, he mea pono ia no nā pane a i ʻole ka nānā ʻana. Hiki ke hoʻohana ʻia nā pahu V no nā noi like ʻole, e like me ka waiho ʻana o nā laʻana, centrifugation, a me nā hoʻokolohua analytical.