A fluid containment structure that includes a substrate with a gasket surface and a form-in-place gasket disposed on the gasket surface and a method for forming the fluid containment structure are described. The form-in-place gasket is disposed around and marks the perimeter of an interior area on the substrate. The interior area and the form-in-place gasket define a well that is adapted for retaining a fluid. The fluid containment structure may be associated with or form a portion of an analysis site where a sample fluid retained in the fluid containment structure may be analyzed.