Immunoreactive Trypsin
Also known as: Trypsin-like immunoreactivity; serum trypsinogen
Formal name: Immunoreactive trypsin (IRT)
Related tests: Sweat Chloride, CF gene mutation
At a Glance
Why Get Tested?
To screen for cystic fibrosis (CF) in newborn infants
When to Get Tested?
When a newborn infant has signs and symptoms of cystic fibrosis particularly when it passes no stools in the first 24 to 48 hours of life (meconium ileus) () or where there is a high risk of the baby having the cystic fibrosis due to family history
Sample Required?
A blood sample taken from an infant’s heel, a spot of blood that is put onto filter paper
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