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.
contour. 1  the outline of a figure or body; the edge or line that defines or bounds a shape or object. 2  contour line. 3  Phonetics. a distinctive pattern of changes in pitch, stress, or tone extending across all or part of an utterance, especially across a sentence, and contributing to meaning. 4  to mark with contour lines.