There are 3 altars (Madbahas) at Poruvazhy church. The main madbaha, the central one, is in the name of Mar Baselious Mar Gregorious. This is used for regular services of the church.
There are 2 altars on the north and south of the main one. The altar on the northern side is consecrated to St.Gregorious(Parumala Thirumeni). and the altar on the southern side is consecrated in the name of St.George..