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Hello, my name is***** and I'd like to help you and Kingsley. I would like to ask you some questions to better assess your situation.
1. You mentioned a fecal test showed parasites, do you know exactly what he was diagnosed with?
2. You mentioned blood work. Was anemia the only abnormality? Any mention of the liver, kidneys or thyroid?
3. What food besides the canned tuna are you feeding?
4. Any diarrhea?
Thank you, ***** ***** forward to helping you
I'm sorry, it has been a busy week at work! I am reviewing the blood test you attached and will reply back shortly.
Ok, so looking at the bloodwork, your cat is anemic (low red cell count). You also mentioned he is positive for Giardia. Has your vet done any additional work up to find out why your cat has a low red cell count? Giardia does not typically cause bleeding in the GI tract.
Is Metronidazole the only medication you have been prescribed? Giardia is not known to cause vomiting, so I am concerned that there is something else going on and the Giardia was randomly found (it can cause diarrhea, but I see plenty of pets with Giardia positive fecals that are 100% normal).
You mentioned they wanted to do an ultrasound, have they already done a radiograph?
Vomiting is a very broad symptom with many potential diagnoses. The fact that the overall blood work is normal is great, that rules out a lot of liver & kidney issues. The anemia is concerning, as that indicates blood loss (possibly through his stomach or GI tract). A second stool sample is not wrong, and would be a good place to start. I'm surprised they haven't done a trial of anti-nausea, as pancreatitis, mild liver inflammation, gastritis, gastro-enteritis are all possible causes of vomiting. All of these can occur with normal blood work.
I am so sorry, I did not see this reply back! Feel free to reply to this and I can address any questions you may still have.