what is osmolal
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osmolality urine osmolality a measure of the number of dissolved particles per unit of water in the urine. A more accurate measure of urine concentration than specific gravity, urine osmolality is useful in diagnosing renal disorders of urinary concentration and dilution and in assessing status of hydration.
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- the concentration of a solution in terms of osmoles of solutes per kilogram of solvent. serum osmolality a measure of the number of dissolved particles per unit of water in serum. In a solution, the fewer the particles of solute in proportion to the number of units of water (solvent), the less concentrated the solution.
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Hypotonic hyponatremia Hypoosmolar hyponatremia is a condition where hyponatremia associated with a low plasma osmolality. The term Hypotonic hyponatremia is also sometimes used. When the plasma osmolarity is low, the extracellular fluid volume status may be in one of three states: low volume, normal volume, or high volume. 1 Cause.
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- Osmolality results are not diagnostic; they suggest that a person has an imbalance, but they do not pinpoint the cause. In general, if someone has an increased serum osmolality, it is due to either decreased water in the blood or increased solutes.
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Osmoregulation Osmoregulation is the active regulation of the osmotic pressure of an organism's body fluids, detected by osmoreceptors, to maintain the homeostasis of the organism's water content; that is, it maintains the fluid balance and the concentration of electrolytes (salts in solution) to keep the fluids from becoming too diluted or concentrated.
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- osmolality. the concentration of a solution in terms of osmoles of solutes per kilogram of solvent. serum osmolality a measure of the number of dissolved particles per unit of water in serum.
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Difference Between Osmolality and Osmolarity 4 osmolarity is expressed as osm l and osmolality is expressed as osm kg 5 osmolality is used to determine medical conditions like diabetes shock and dehydration while osmolarity is used for the detection of the concentration of dissolved particles in urine6 osmolality is the commonly used method of measurement in osmometry osmolarity is expressed as osm l and osmolality is expressed as osm kg 5 osmolality is used to determine medical conditions like diabetes shock and dehydration while osmolarity is used for the detection of the concentration of dissolved particles in urine
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Urine Osmolality A comparison of the urine osmolality to the serum osmolality yields additional information about water handling by the kidney or abnormalities of urine concentration or dilution, as does electrolyte studies. Typically, the ratio of urine osmolality to serum osmolality is 1-3.n a healthy state, the specific gravity of the urine corresponds to the urine osmolality. An evaluation of the osmolality, either routinely or under artificial conditions, indicates the kidney’s ability to maintain tonicity and water balance of the extracellular fluid.
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- Serum and Urine Osmolality. Osmolality of body fluid is a measure of its solute/water ratio. The osmolality of serum, urine, or other body fluids depends on the number of osmotically active ions and molecules dissolved in a kilogram of body water. Sodium, potassium, chloride, bicarbonate, glucose and urea are the osmotically important body fluid solutes.
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Molality Molality, also called molal concentration, is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution. A commonly used unit for molality in chemistry is mol/kg. A solution of concentration 1 mol/kg is also sometimes denoted as 1 molal.
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Diabetic hyperglycemic hyperosmolar syndrome This is called hyperosmolarity. It is a condition in which the blood has a high concentration of salt (sodium), glucose, and other substances. This draws the water out of the body's other organs, including the brain.
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Hyponatremia and Hypernatremia Water movement between body fluid compartments is regulated by the effective osmolality of the solutes within each compartment. Sodium is the main determinant of plasma osmolality, and water moves toward body compartments with higher osmolality and away from those with lower osmolality.
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- The osmolality urine test the concentration of particles in urine. Osmolality (particles/kg water) and osmolarity (particles/liter of solution) are sometimes confused, but for dilute fluids such as urine they are essentially the same.A blood test may also be done to measure osmolality.See: Serum osmolality.smolality (particles/kg water) and osmolarity (particles/liter of solution) are sometimes confused, but for dilute fluids such as urine they are essentially the same. A blood test may also be done to measure osmolality. See: Serum osmolality.
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What is a urine osmolality test? It’s the job of the kidneys to block or allow certain particles into the urine to maintain a balance within the body. Your doctor can use the urine osmolality test to check the levels of water and particles in your urine. Urine osmolality is a marker for how well the kidneys are working. It also helps your doctor diagnose certain problems. In most cases, a doctor may also order a blood, or serum, osmolality test. Levels of the following commonly affect blood osmolality: salt, or sodium, which is one of the most important electrolytes in blood and urine.
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Osmolarity and Osmolality Osmolarity and osmolality are units of solute concentration that are often used in reference to biochemistry and body fluids. While any polar solvent could be used, these units are used almost exclusively for aqueous (water) solutions.
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Urine Specific Gravity Osmolality is a more specific test for urine concentration. The urine specific gravity test is easier and more convenient, and is usually part of a routine urinalysis. The osmolality test may not be needed. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples.
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Osmolarity and Osmolality Post. Share. Both osmolarity and osmolality are defined in terms of osmoles. An osmole is a unit of measurement that describes the number of moles of a compound that contribute to the osmotic pressure of a chemical solution.Osmolarity is defined as the number of osmoles of solute per liter (L) of solution.oth osmolarity and osmolality are defined in terms of osmoles. An osmole is a unit of measurement that describes the number of moles of a compound that contribute to the osmotic pressure of a chemical solution. Osmolarity is defined as the number of osmoles of solute per liter (L) of solution.
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- (ɪˈmɔr tl) adj. 1. not mortal; not liable or subject to death: immortal souls. 2. not liable to perish or decay; everlasting: immortal wisdom. 3. perpetual; constant: an immortal enemy. 4. of or pertaining to immortal beings or immortality. 5. (of a laboratory-cultured cell line) capable of dividing indefinitely.
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Osmolality, Osmolarity and Fluid Homeostasis Osmolality and osmolarity are measurements of the solute concentration of a solution. In practice, there is negligible difference between the absolute values of the different measurements. For this reason, both terms are often used interchangeably, even though they refer to different units of measurement.
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- Osmolality and Osmolarity. Osmolality: concentration of. solute(particles) per kilogram of water. Osmolarity: concentration of. solute(particles) per liter of a solution (the. solvent does not have to be water) Osmotic pressure:pulling power of water. Silly definition stuff.
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Plasma osmolality The osmolar gap is the difference between the measured osmolality and the calculated osmolarity. The difference in units is attributed to the difference in the way that blood solutes are measured in the laboratory versus the way they are calculated.
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Serum Osmolality The serum or plasma osmolality is a measure of the different solutes in plasma. Among other applications, serum osmolality is indicated to evaluate the etiology of hyponatremia and may be used to screen for alcohol intoxication by means of the osmolal gap.
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- A urine osmolality test may be ordered along with blood testing when a health practitioner wants to compare urine results with the serum osmolality and/or when the person being tested is producing increased or decreased quantities of urine. Both may be ordered when is is suspected that the person may have diabetes.
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Is there a difference? Osmolarity vs. Osmolality.. Osmolarity is the number of milliosmoles/liter (mOsm/L) of solution. It is the concentration of an osmotic solution. This is the common bedside calculation used in clinical settings for osmotic activity. Example: Plasma and other body fluid osmolarity: 270 – 300 mOsm/L.
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Serum and Urine Osmolality Serum osmolality is usually ordered to investigate hyponatremia (Na+ <135 mmol/L or 135 mEq/L). Sodium is the main extracellular fluid cation and an important determinant of total body water homeostasis. Elevated serum sodium increases extracellular volume and decreases intracellular volume.
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2.3 Osmolality and Tonicity Osmolality is a measure of the number of particles present in solution and is independent of the size or weight of the particles. It can be measured only by use of a property of the solution that is dependent solely on the particle concentration.