Early morning sample of urine is usually taken for mootra pariksha. The first stream of urine after waking up is avoided.
Vata aggravated urine is less in amount, has a yellow hint to it, and dries quickly.
Pitta aggravated urine is reddish to dark yellowish and produces burning.
Kapha dominance causes watery, very white urine.
Rakta vitiated urine is presented with blood and is hot.