The Compendium of Caraka 8.1.15

8.1.15

dvitrān saviṭkānapanīya vegānmeyaṃ vireke vamane tu pītam/
kramāt kaphaḥ pittamathānilaśca yasyaiti samyagvamitaḥ sa iṣṭaḥ//

In purgation, the measure is taken after setting aside two or three bouts containing stool; but in emesis, [it is measured after setting aside] what was drunk. / One from whom kapha, then pitta, and then vāta come out sequentially is considered properly vomited.