Various biomarkers, including proteins, serological, inflammatory, molecular, volatile, and hormonal, are of potential diagnostic and therapeutic value for giardiasis; however, the most notable ones are VSPH7, VSP5G8, α-1-giardin, α- and β-tubulins, Hsp70, Hsp90, rCWP2, GSA 65, SIgA, and miR5. Here, GNAS is linked to giardiasis.