Green poop tested positive for blood

Madison

Hey Mama’s so my daughter has had dark green poop since she was just a couple weeks old. She’s now 15 weeks and 4 days. So about 3 weeks ago they tested it for blood and there was blood so they thought it was a cows milk protein allergy so they put her on Neocate formula, since Allimentum just wasn’t doing the trick. Her poop was still the same color and had it tested again yesterday and there is still blood. Has any mamas had a similar experience and if so what was the cause?