Hi there, the normal ranges are:-
800 to 2000 ml/day (with a fluid intake of about 2 L/day)
Decreased urine output is defined as producing less than 500 milliliters of urine in a 24 hour period. It's medical term is Oliguria
Although a significant decrease in urine output
may indicate a serious, even life-threatening condition, adequate urine output can be restored with prompt medical treatment.
The most common causes are dehydration due to vomiting, diarrhea, or fever, with a lack of adequate fluid intake. Urinary tract obstruction or an infection. Some medications may also affect output.
Some possible questions to answer are:-
When did this begin?
Did it occur suddenly?
Has it rapidly become worse?
Quality
How much do you drink each day?
Does drinking more increase your urine output?
How much urine do you produce each day?
What color is the urine?
Has there been fever?
Has there been diarrhea?
Has there been vomiting? With or without nausea?
Is thirst decreased?
What other symptoms do you have?
What medications do you take?
Do you have any allergies?
Do you have access to adequate fluids?
Have you had any recent injuries such as burns?
Have you been sick?
Do you have a history of a problem with your kidneys or bladder?
You have done the right thing in contacting doctor and I hope they sort this out for you very soon.