Cloudy urine can be caused by a variety of conditions, including vaginal discharge, sexually transmitted diseases, dehydration, certain autoimmune disorders, as well as infection, inflammation, or other conditions of the urinary tract (kidneys, ureters, bladder and urethra).loudy urine can be caused by a variety of conditions, including vaginal discharge, sexually transmitted diseases, dehydration, certain autoimmune disorders, as well as infection, inflammation, or other conditions of the urinary tract (kidneys, ureters, bladder and urethra).
Blood cholesterol, triglyceride and glucose levels are the most common tests that require fasting. Vitamin levels, such as vitamin E or A, also need to be drawn when the patient is fasting. Typically at least a 12-hour fast is required for cholesterol and triglyceride screenings.
Quick Answer. Patients should fast for at least 12 hours before they have a fasting blood test, according to St. John Providence Health System. Not all blood tests require patients to fast, but those that do require that patients abstain from food or any type of beverage besides water before their test. Continue Reading.