Urinalysis and Body Fluids 6th Edition by Majorie DiLorenzo, Susan Strasinger

Exercise 10

A watery black stool from a neonate is received in the laboratory with requests for an APT test, fecal pH, and a Clinitest.

a. Can all three tests be performed on this specimen? Why?

b. If the Clinitest is positive, what pH reading can be expected? Why?

c. The infant’s hemoglobin remains constant at 18 g/dL. What was the significance of the black stool?

d. Would this infant be expected to have ketonuria? Why or why not?

Step 1 of 4

a.

“APT test” is used to differentiate between the maternal blood and fetal blood in the feces of neonates.

In this specimen, APT test cannot be performed as the hemoglobin is denaturized that caused the black color of the stool.