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a test for identifying fetal blood by the addition of sodium hydroxide and water to a specimen.
a test for blood in the stool of a newborn. The test differentiates between maternal and newborn blood. The presence of newborn blood indicates active GI bleeding or necrotizing enterocolits.
[Leonard Apt, U.S. pediatric ophthalmologist]
A test used originally to identify the source of black (bloody) stools in newborn infants; it is now used in modified form to distinguish fetal from maternal hemoglobin in blood samples from any source, e.g., the umbilical cord or the gastrointestinal tract.See: swallowed blood syndrome