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 line. n. A line on a map that joins points of equal elevation. contour line. n. (Physical Geography) a line on a map or chart joining points of equal height or depth. Often shortened to: contour. conâ²tour line`. n. a line representing the locus of points at the same elevation on a topographic surface. [1835â45]