IgG levels of all calves should be routinely measured after first suckling (between 24-48 hours old). Calves are born with no circulating antibodies (IgG) and must receive adequate antibodies from the cow's colostrum. Up to 40% of newborn calves have low IgG levels, placing them at high risk for infection, serious illness, or death. Low IgG may result from premature lactation, poor suckling, malabsorption, or low-quality colostrum. An IgG test measures whether a calf's IgG level is normal, low, or very low.
Color intensity on Test Line is proportional to Bovine Calf IgG concentration.
Compare the relative intensities of the cassette lines to the Interpretation chart in the instructions.

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