IgG levels of all calves should be 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. The Immuno-Chek G™ IgG test is a point of care test that measures whether a calf’s IgG level is normal, low, or very low.
Color intensity on Test Line is proportional to Calf IgG concentration.

Compare the relative intensities of the cassette lines to the Interpretation chart in the instructions.