i**********d
发帖数: 853 | 1 2011 FA 471页上，有阴影的表格中，在“prerenal,renal和postrenal”的情况下，
Urine Osmolality分别是“>500, <350和<350”,而Urine Na分别是“<10, >20和>40”.
我的问题是：
我的理解：Urine Osmolality是由尿中Sodium的浓度决定的，所以Urine Osmolality和
Urine Na应当是成正比的关系。
但是FA 471页上却显示的是两者成负比的关系，请哪位高手给解释一下？
十分感谢！ | r*********s
发帖数: 1027 | 2 不是,血浆渗透压和钠相关，urine取决于尿素、肌酐和其它代谢产物。
In general, urine consists of urea and other organic and inorganic chemicals
dissolved in water. Considerable variations in the concentrations of these
substances can occur as a result of the influence of factors such as dietary
intake, physical activity, body metabolism, endocrine function, and even
body position. Urea, a metabolic waste product produced in the liver from
the breakdown of protein and amino acids, accounts for almost half of the
total dissolved solids in urine. Other organic substances include primarily
creatinine and uric acid. The major inorganic solid dissolved in urine is
chloride, followed by sodium and potassium. Small or trace amounts of many
additional inorganic chemicals are also present in urine. The concentrations
of these inorganic compounds are greatly influenced by dietary intake,
making it difficult to establish normal levels. Other substances found in
urine include hormones, vitamins, and medications. Although they are not a
part of the original plasma filtrate, the urine may also contain formed
elements such as cells, casts, crystals, mucus, and bacteria. Increased
amounts of these formed elements are often indicative of disease.
”.
【在 i**********d 的大作中提到】
: 2011 FA 471页上，有阴影的表格中，在“prerenal,renal和postrenal”的情况下，
: Urine Osmolality分别是“>500, <350和<350”,而Urine Na分别是“<10, >20和>40”.
: 我的问题是：
: 我的理解：Urine Osmolality是由尿中Sodium的浓度决定的，所以Urine Osmolality和
: Urine Na应当是成正比的关系。
: 但是FA 471页上却显示的是两者成负比的关系，请哪位高手给解释一下？
: 十分感谢！
| i**********d
发帖数: 853 | 3 Thanks!
chemicals
these
dietary
primarily
【在 r*********s 的大作中提到】
: 不是,血浆渗透压和钠相关，urine取决于尿素、肌酐和其它代谢产物。
: In general, urine consists of urea and other organic and inorganic chemicals
: dissolved in water. Considerable variations in the concentrations of these
: substances can occur as a result of the influence of factors such as dietary
: intake, physical activity, body metabolism, endocrine function, and even
: body position. Urea, a metabolic waste product produced in the liver from
: the breakdown of protein and amino acids, accounts for almost half of the
: total dissolved solids in urine. Other organic substances include primarily
: creatinine and uric acid. The major inorganic solid dissolved in urine is
: chloride, followed by sodium and potassium. Small or trace amounts of many
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