Yes, the underwater weight test is the most accurate. It also provides
B.M.I. information, %age of body fat, which is also important! It's also easy, isn't it? Unless, of course, you're a baby who is afraid to get your face wet. Would you like a little cheese with that whine? ;) Where's Sis? Why isn't she so shocked at Mom?
Now, WHY would your mom want an extremely accurate weight test performed on you AND your sister? Are you stealing auto parts and building a car in your bedroom? Sneaking pallets of Oreos and then denying that you ate them? Did Mom schedule you both for H2O tests every week, same day? Are you supposed to be on a diet but you're cheating? Are you diabetic, and lying? Well, that would be SO dumb, since you can kill yourself! Over a handful of sweets? I don't think so!! Oh, how old are you and Sis ? So, you didn't shower. Ewww. Wahhh. And you had to squeeze your giant self into tight pants? Bragging? AGAIN? :D
So, update us and give us the REASON you believe that making you go for a weight test is "Stooping so low"! Then, with those facts, perhaps you'll get answers.
I'd offer this, though, JUST on the facts you gave us.
You are darn stinking LUCKY to have a Mom who would drop everything to get you to the doctor's, and I hope you appreciate it! You probably even ate lunch 'out'. Right? Ohh, poor you. Unless you're already 'gordo', sneaking food, etc., and we're waiting for that answer.
The fact that YOUR MOM cares about your health, your weight, and, YIKES, she probably makes you do homework, too! How RUUUDE. Does she make you play sports? Ride your bike? Have time limits on TV & computer? Go to (oh, how embarrassing!) Back To School Nights? Because she cares about the bonehead teenager who probably still doesn't refill the toilet paper roller because HE doesn't need it that often?
YOU better get OFF your high-horse, get down on your knees and thank your MOM in 3 language!