In various embodiments, the present disclosure pertains to methods for measuring a size of a body lumen. A method may comprise: (a) inserting a balloon comprising a circumference, a proximal end, and a distal end into the body lumen, wherein the balloon is at least partially compliant (b) introducing an inflation fluid into the balloon inside the body lumen until a point in time where the circumference of the balloon engages an inner wall of the body lumen (c) measuring an amount of the inflation fluid introduced into the balloon and (d) determining the size of the body lumen based at least in part upon a total amount of inflation fluid introduced into the balloon at a point in time. In various embodiments, the present disclosure pertains to apparatuses for measuring an inner diameter of a body lumen.
