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--- home:tests:dexa [01.03.2019] – [Notes and comments] sallieq
+++ home:tests:dexa [01.03.2019] – [Further Information] sallieq
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 Your T-score compares you to a young adult of your gender with peak bone mass. Any T-score larger than -1 is considered normal.
-The Z-score reflects the amount of bone you have compared to other people your same size, age and gender. This number is related to percentiles. Originally, only Z-scores were calculated, but when bone density machines became commercially available beginning in the 80's, T-scores were devised because different manufacturers could not agree on a standard measurement. You can read about calculating and interpreting both scores here.
+The Z-score reflects the amount of bone you have compared to other people your same size, age and gender. This number is related to percentiles. Originally, only Z-scores were calculated, but when bone density machines became commercially available beginning in the 80's, T-scores were devised because different manufacturers could not agree on a standard measurement.
-Still confused about what DEXA scores mean - in simple terms? Read this from the NIH.
-How to read DEXA reports
-There are step-by step directions on how to read DEXA reports in this tutorial.
 Checking against previous BMD results to assess if the rate of loss has slowed may show the turnaround.. see also..
+===
+Problems With DEXA Scores ===
-Problems With DEXA Scores
 The reproducibility of DEXA scores is frequently reported at 1-2 percent. That 1-2 percent is the average, but the range of reproducibility can vary as much as 7 percent. Variations come from changes in machine reading (using the same machine), technologists who are doing the test, and slight changes and body positioning, all of which can affect the end results. The most frequent source of error in repeat tests is patient positioning. The technology is limited because BMD is a two-dimensional image of a three-dimensional object.
-A few more issues related to DEXA scores are covered in this Wikipedia article which says, inter alia, "It is important for patients to get repeat BMD measurements done on the same machine each time, or at least a machine from the same manufacturer. Error between machines, or trying to convert measurments from one manufacturer's standard to another can introduce errors large enough to wipe out the sensitivity of the measurments."
+A few more issues related to DEXA scores are covered in this Wikipedia article which says, inter alia, "It is important for patients to get repeat BMD measurements done on the same machine each time, or at least a machine from the same manufacturer. Error between machines, or trying to convert measurments from one manufacturer's standard to another can introduce errors large enough to wipe out the sensitivity of the measurments." https://en.wikipedia.org/wiki/Dual-energy_X-ray_absorptiometry
-This Medscape article (registration required, but it is free) reviews the uses and limitations of BMD measurements and the relationship between BMD and bone strength.
 ==== Other Techniques ====
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 A Review - Vitamin D and Calcium in Sarcoidosis (7-5-03)
 http://www.sarcinfo.com/calcium.htm
+ Epidemiological study finds a strong association between high 1,25 D levels and osteoporosis. Relationships between bone mineral density, serum vitamin D metabolites and calcium:phosphorus intake in healthy perimenopausal women. Brot C, Jorgensen N, Madsen OR, Jensen LB, Sorensen OH.
+The Danish epidemiologist Brot studied 500 healthy women ( that is they were not drawn from a population with particular health issues) aged 42 to 58 and concluded that in this group bone density was strongly inversely proportional to 1,25 D levels ( that is low bone density was strongly associated with high 1,25 D levels) and only rather weakly directly proportional to 25 D levels. The sample was chosen randomly - and was not done to test the impact of any particular treatment programme. (({{pubmed>long:10363752}}))
+Influence of smoking (({{pubmed>long:10602348}}))
+vitamin K(1) intake was not associated with effects on BMD or fracture risk.   (({{pubmed>long:16683180}}))
 === Medications to Avoid ===

home/tests/dexa.txt · Last modified: 09.14.2022 by 127.0.0.1