This happens about 2-3% of the time in people with celiac disease and can lead to false-negative test results. Common tests for celiac disease include: 1  Anti-tissue transglutaminase antibody (anti-tTG), IgA: detects antibodies to tissue transglutaminase, an enzyme that causes the crosslinking of certain proteins. 2  Anti-tTG, IgA is the most sensitive and specific blood test for celiac disease.
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.
Jake Sutton/Flickr. Definition: A contour is the line which defines a form or edge-an outline. Contour drawing is the place where most beginners start, following the visible edges of a shape. The contour describes the outermost edges of a form, as well as dramatic changes of plane within the form. ' Blind contour drawing ' is when contour drawing is done without looking at the paper.