If your T-score is –2.5 or less: you have osteoporosis, even if you haven't yet broken a bone.

The term T-minus refers to the amount of time before this time of interest. T represents some point in time (of interest). Technically, the T in T-minus is an indicator of the main sequence countdown time, which serves as a synchronization device for most devices and procedures that must be completed before, during, and after launch. d-day h-hour t-Time We are at T-minus 1 minutes.

If your T-score is between –1 and –2.5: you have low bone density, known as osteopenia, but not osteoporosis. In a NASA countdown to a rocket launch, T-minus means time minus the T stands for the exact time at which the rocket is to be launched.

If your T-score is –1 or greater: your bone density is considered normal.

The World Health Organization has established the following classification system for bone density: The DEXA scan or ultrasound will give you a number called a T-score, which represents how close you are to average peak bone density. DEXA accomplishes this with only one-tenth of the radiation exposure of a standard chest x-ray and is considered the gold standard for osteoporosis screening-though ultrasound, which uses sound waves to measure bone mineral density at the heel, shin, or finger, is also used at health fairs and in some medical offices. While this technology can measure bone density at any spot in the body, it is usually used to measure it at the lumbar spine (in the lower back), hip (a specific site in the hip near the hip joint), and femoral neck (the top of the thighbone, or femur). And it's simple: you lie on a table while a scanner passes over your body. It means that there are 43 hours until the scheduled liftoff according to the countdown clock.There are numerous 'built-in holds', where unscheduled problems can be corrected, and still launch 'on-time'.

The process is quick, taking only five minutes. What does 'T' stand for The 'T' in 'T Minus 43 Hours' means 'Time until launch'. For this procedure, a machine sends x-rays through bones in order to calculate bone density. Several technologies can assess bone density, but the most common is known as dual energy x-ray absorptiometry (DEXA).

What does t minus