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Hello. Thanks for the question.
In a young cat like this with vomiting and diarrhea, it's likely something infectious. This could be feline distemper, panleukopenia virus (feline parvo), a parasite (Coccidia, Giardia) or some other bacterial infection.
If it were an obstruction, I would not expect to see any diarrhea. The fact that it's the upper and lower GI, that makes it likely to be infectious.
The treatment is typically with fluids, antibiotics (Metronidazole) and GI meds to control the vomiting and diarrhea. Depending on her hydration, this may be done in the hospital on IV fluids or as an out-patient with sub Q fluids under the skin. Most cats will get back to normal within 2-3 days of starting treatment.
I hope this helps, let me know if you have any other questions.
Many infections are possible with indoor cats. Viruses (parvo, panleukopenia, corona) and bacterial infections are often times airborne. Most cats that we see are indoor cats, and we still see infectious and parasitic infections. Parasites are often passed from mom or when kittens. It may take a while for them to show clinical signs. A fecal exam will quickly rule those out.
The majority of GI infections are not diagnosed with bloodwork. We just treat them symptomatically and they usually resolve.