Osmolality
Definition This test measures the osmolality (concentration of particles) of serum (the fluid portion of blood, without fibrinogen).
Why is the Test Performed?
Osmolality measures the concentration of particles in solution. Osmolality increases with dehydration and decreases with overhydration. In normal people, increased osmolality in the blood will stimulate secretion of ADH (antidiuretic hormone). This will result in increased water reabsorption, more concentrated urine, and less concentrated plasma. A low serum osmolality will suppress the release of ADH, resulting in decreased water reabsorption and more concentrated plasma.
Today's Top News Stories | • | Early Elective C-Sections Produce Complications - Jan 07, 2009, 17:00
Babies delivered at 37 weeks have double the troubles of those born at 39 weeks.
| • | Gene Governs Response to Leukemia Chemotherapy - Jan 07, 2009, 17:00
Acute lymphoblastic leukemia is most common pediatric cancer. | • | Teen Birth Rate Up in 26 States in 2006 - Jan 07, 2009, 14:00
Highest rates in South, Southwest; lowest rates in Northeast, government reports. | • | Clinical Trials Update: Jan. 7, 2009 - Jan 07, 2009, 09:58
- Hypertension (High Blood Pressure)
- Attention Deficit/Hyperactivity Disorder (ADHD - Pediatric)
- Memory Loss
| • | Study of Everest Climbers Questions Oxygen Use - Jan 07, 2009, 17:00
Whether low levels would work for ER patients with hypoxia remains unclear. |
|
