Which fruits/food to eat if i am having low hb around 10, also prone to diarrhea and can i take calcium vitamins doctor diagnosed ca19-9 test do i need that?

Anemia at your age is concerning and must be explained since you're not menstruating. Initial studies would be red cell indices,retic count & include serum iron&iron binding capacity, vitamin B12 levels, serum electrophoresis, stool tests to look for occult bleeding. CA19-9 is a marker for cancer, but if not very elevated, won't tell the type or cause of your anemia. Bloody diarrhea causes anemi