Sub Q fluids before blood/urine testing or not??

I wonder if anyone knows if giving sub Q fluids can impact any blood or urine tests.
I have posted to a separate thread about my lionhead Madelyn. She has been fussy eating, especially hay; was not drinking much, and had small poos. Meds and sub Q fluids have helped.
She has a vet appointment in the morning (12 hours from now). I wanted to take a urine sample with me (if I can get one in the morning), so it can be checked for crystals, bacteria, microscopic blood.
I am deciding if I should or should not give her sub Q fluids before bedtime tonight. If I give her fluids, vet may not be able to see if she is dehydrating without fluids or not. I also wonder if giving fluids will dilute her urine and impact any urine test.

As noted in my other post, my Raven is having another dental on Tuesday. In October he had a dental and blood work and blood work was well within normal values, including his kidney values. At that time he was getting sub Q fluids for over a week before his blood work. He has been having stasis and issues for a few weeks so I am having another dental done on Tuesday to determine if his teeth are a factor this time. Could his October blood work be inaccurate if he was getting fluids for days before his testing even if he was processing the fluids quickly?

I think that if SQ fluids have been given for several days prior to blood testing then there may be a chance of the blood results being unreliable. I think it would depend on why the SQs were being given in the first place and if the Rabbit has any pre-existing illnesses such as compromised renal function. Over infusion can cause problems of it's own. So how much is given is also relevant.

All that said, as you know I am totally unqualified so it is definitely a question you'd need to ask a Vet. Can you contact an out-of-hours service for telephone advice ? I hope all goes well for Raven's Dental and that Madelyn's Vet check may give some clues as to what may be wrong. xx

Jack's-Jane said:

I think that if SQ fluids have been given for several days prior to blood testing then there may be a chance of the blood results being unreliable. I think it would depend on why the SQs were being given in the first place and if the Rabbit has any pre-existing illnesses such as compromised renal function. Over infusion can cause problems of it's own. So how much is given is also relevant.

All that said, as you know I am totally unqualified so it is definitely a question you'd need to ask a Vet. Can you contact an out-of-hours service for telephone advice ? I hope all goes well for Raven's Dental and that Madelyn's Vet check may give some clues as to what may be wrong. xx

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I appreciate your sharing your thoughts. Raven was receiving fluids because he was not drinking much and his poo was very hard and sparse
. I consider normal drinking habits, amount drinking, speed of absorption, and output when giving fluids. IMO best if the bunny drinks on their own. He had no prior diagnosis of renal failure.

When I cleaned Madelyn's litterbox five hours ago it contained nice poos. Now she is passing a mix that includes several very small hard poos . The mystery continues.