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When the vet tests a stool sample for parasites, how accurate is it?


  1. ✯Love✯ is a GSD *Please re-add!* says:

    Did the stool samples you sent in contain any of the "worms"? Rice-looking white things in the feces are a good indication of worms, and one should be taken in to the vet for them to ID

    A fecal is hit and miss, there are many things that could cause a POSITIVE animal to not have anything in the feces. They are basically looking for larva or eggs in the feces. They take one little speck from the stool sample and examine it with a microscope.

    Vets will use other symptoms to diagnose the cause, not just the fecal.

  2. Nekkid Truth! says:

    depends on how fresh, and how large, the sample is.

    All they can look for is the presence of segments or eggs, if there happens to be no segments or eggs in that particular sample, then the test will be negative.

    If she is on a wormer, then you will see worms in her stools. They have to come OUT somehow!

  3. UHave2BeKiddingMe says:

    Not terribly accurate.

    When I got my Pom puppy last year I took him into the vet the next day for his exam along with a fecal.

    Fecal came back negative. The vet did not worm him.

    Imagine my surprise when a few months later when one of my dogs was ill I took in a fecal and found out she had worms, as did the other two.

    The vet is sure it came from the puppy since my dogs have been clean all these years.

    Worms are only in the stool a certain percentage of the time which is why the fecal is not always accurate.

  4. Dr Larry says:

    Fecal flotation tests are usually very accurate for diagnosing many intestinal parasites in dogs. The sample is mixed with a special solution that causes the eggs of the parasite to float to the top of the solution. The sample is then placed on a microscope slide to look for the presence of eggs.
    A single negative sample does not mean that your dog is free from parasites because the adult worms may not be producing eggs at that specific time. A series of examinations may be needed in some cases to positively rule out intestinal parasites.

  5. Lynne says:

    It sounds like you are finding tapeworms, which do not show up on a fecal float. During a fecal float the vet is looking at some stool that has been soaked in a solution that causes the eggs of the parasites to float to the top. Tapeworm eggs are very heavy and do not float, so seeing them in the stool is usually the only way to check for them. Tapeworms are caused by your dog consuming fleas as she grooms herself, or by eating dead birds and other animals. They will not be cured by pyrantel worming paste, different parasites need different meds to kill them. Get some cestex from the vet, make sure she doesn’t have fleas, wash all bedding in hot water, vaccumm, and clean the yard of her stool regularly to help prevent her getting them again.

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