What is the ammount necessary for a urine test sample?

My urine sample for a uriculture came back as contaminated specimen and I had to repeat it but this time I gave little urine like less than a quarter (or so I think) of the cup which might be about 2 ounces. I told them that was all I could pass and they said nothing so I left. I am worried the urine isn't... show more My urine sample for a uriculture came back as contaminated specimen and I had to repeat it but this time I gave little urine like less than a quarter (or so I think) of the cup which might be about 2 ounces. I told them that was all I could pass and they said nothing so I left. I am worried the urine isn't enough and I have to come back again and I can't ask for more permits at work. Does anybody know if urine volume affects the results or something?
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