Due to the infections,ulcers,rupturing of internal tissues,chronic disorders due ill health conditions.
Something serious. See a doctor
White blood cells are usually not found in the urine due to the kidney. When there are white blood cells in the urine this if due to an infection. The kidney becomes inflamed and this allows the passing of white blood cells.
This is probably not blood from the urinary tract but mixed in with the urine as it is discharged from the uterus and vagina. If you are concerned a post foaling evaluation of the mare's reproductive and urinary tract may be advisable.
It is the urine not the blood. It comes from amino acids being broken down. Could you be pregnant?
No, blood in your urine has absolutely nothing to do with menstruation. Urine comes from your bladder via your urethra, whereas menstrual flow comes from your uterus via your vagina - two completely different bodily parts. The first day of menstruation is the first day of bleeding from your vagina. If you have blood in your urine it's a sign of a urinary tract infection so you should talk to your doctor.
You should see the doctor. It might just be caused by lifting something very heavy but it could be worse.
what causes inflamation to be in ones urine
Blood is not "converted" into urine. Urine is EXTRACTED from the blood by the two organs called the "kidneys".
Urea is one of the substances in urine, and urine is in your blood stream until the kidney extract the urine from your blood.
Urine comes from your urethra, not your vagina - menstruation comes from the vagina. If you are peeing blood then you have a urinary tract or bladder infection so should seek immediate medical attention.
Testing depends on what they are testing to see what problems you have related. Does your passing urine burn, contain blood? Generally speaking no tests are bad but supply proper answers to help that person.
As you can proably guess, a Chihuahua does not have a large amount of blood. You should have your dog looked at by a vet.