If albumin is detected in a urine sample collected at random, over 4 hours, or overnight, the test may be repeated and/or confirmed with urine that is collected over a 24-hour period (24-hour urine).
Say, for my $20 pedicure, I gave $3 tip to my foot scrubber and leg massager/toenail painter. The 2 ladies I went with gave nothing. It felt awkward, but my husband having worked in the restaurant and retail worlds, insists we tip due to personal experience. If your facial is $40, tip $6-$10. I average on an 18% scale, but 15-20% is perfectly acceptable and very generous. For mother's day, we give my mom a hot stone massage and a pedicure. We always send her with $25-$30 extra for tips.
After reading through the above, you know why and when to tip your limo or town car driver, but exactly how much is appropriate? Most etiquette websites such as EmilyPost.com suggest a gratuity of 15-20% of the fare, although anywhere between 10% and 20% is considered perfectly acceptable.