Kudos for taking your rabbits in to the vet for checkups, it's something not a ton of rabbit owners do. Even if your rabbits are perfectly healthy, it's a good thing to get them in to see your vet once a year or so, the same as if you had a dog or cat. That way your vet will know them better and know more of what's normal for your pet, and hopefully be able to better pick out when something is wrong.
I've never heard of anything saying that taking blood from a rabbit is any different than taking it from any other animal. Running blood work in rabbits is often times a very important diagnostic tool. Getting blood drawn once in awhile even when your rabbit is healthy can be a good thing because it allows you and your vet to set a standard for what's normal for your rabbit. That way, if he/she does become sick in the future, blood samples can be compared to the sample results that where taken while the animal was healthy, which can make it easier for vets to pick out any abnormalities.
My rabbit vet recommends blood testing to be done yearly as part of the annual physical, especially in older rabbits as blood work done yearly can track the condition of their internal organs. In the best case senerio, it helps set a base line for what is normal for your pet. Worst case, blood tests can be used to detect a number of different medical problems sometimes even before the rabbit has started to show any signs of being sick. I also always have blood tests done before any surgeries as well, just for my peace of mind.
I personally also have my vet do fecal exams once a year as well. If your rabbits are indoors only, and don't have any access to other house hold pets, you may be able to get away with testing less often. My rabbits are indoors but love to spend time with my dog, and I worry that he could potentially pass on parasites to them so I'm overly cautious and just opt for the testing. Parasites kind of creep me out haha, so I usually want to check for them just to be sure.
Talk to your vet about what they recommend though. A good rabbit savvy vet who has lots of experience working with rabbits will be able to tell you what tests and such they feel are important to do on a regular bases.
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