An osmolality test measures the concentration of particles in a solution. In this case, the solution is urine.
ProcedureHow the test is performed: You are instructed to collect a "clean-catch" (midstream) urine sample. To obtain a clean-catch sample, men or boys should wipe clean the head of the penis. Women or girls need to wash the area between the lips of the vagina with soapy water and rinse well. As you start to urinate, allow a small amount of urine to fall into the toilet bowl (this clears the urethra of contaminants). Then, in a clean container, catch about 1 to 2 ounces of urine and remove the container from the urine stream. Give the container to the health-care provider or assistant. To collect a urine sample from an infant: Thoroughly wash the area around the urethra. Open a urine-collection bag (a plastic bag with adhesive paper on one end), and place it on your infant. For males, the entire penis can be placed in the bag with the adhesive attached to the skin. For females, the bag is placed over the labia. Place a diaper over the infant (bag and all). Check your baby frequently and remove the bag after the infant has urinated into it. The urine is then drained into a container for transport back to the health-care provider. No special preparation is necessary for this test.
ResultsGreater-than-normal measurements may indicate:
Lower-than-normal measurements may indicate:
Review Date: 08/21/2011
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
Osmosis? Osmolality? Osmolarity?
Osmotic Diuresis Water diuresis *High amount of H2O reabsoebed in *Normal absorption. PCT. *A lot of solutes are lost. *loss of solute amount is less. *Very high amounts of urine are *Amounts of urine produced are less produced. than that in osmotic diuresis. *Low medullary osmolality. *High medullary osmolality. *Normal *The limiting concentration gradient *The limiting gradient is not reached. for Na is reached at PCT. *Hyponatremia may occur. *Takes more time to get hyponatremia.
560mosmol/L
pretty sure it's green with your chemistry.
DefinitionThe 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 osmolalityHow the test is performedA "clean-catch" (midstream) urine sample is needed. For information on how to collect the sample, see clean catch urine culture.How to prepare for the testYour health care provider will tell you if you need to stop taking any drugs that may interfere with the test. Drugs that can increase specific gravity measurements include dextran and sucrose.Receiving intravenous dye (contrast medium) for an x-ray exam up to 3 days before the test can also interfere with results.Eat a normal, balanced diet for several days before the test.How the test will feelThe test involves normal urination, and there is no discomfort.Why the test is performedThis test helps evaluate your body's water balance and urine concentration.Osmolality is a more exact measurement of urine concentration than the urine specific gravity test.Normal ValuesNormal values are as follows:Random specimen: 50 to 1400 milliosmoles per kilogram (mOsm/kg)12 to 14 hour fluid restriction: Greater than 850 mOsm/kgNote: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.What abnormal results meanAbnormal results are indicated as follows:Greater-than-normal measurements may indicate:Addison's disease (rare)Congestive heart failureDehydrationGlycosuriaRenal artery stenosisShockSyndrome of inappropriate ADH secretionLower-than-normal measurements may indicate:Aldosteronism (very rare)Diabetes insipidus (rare)Excess fluid intakeKidney failureRenal tubular necrosisSevere pyelonephritisAdditional conditions under which the test may be performed:Complicated UTI (pyelonephritis)High blood sodium levelLow blood sodium levelExcessive urinationReferencesBazari H. Approach to the patient with renal disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 115.
Urine osmolality test. Urine osmolality is a measurement of the number of dissolved particles in urine.
50 mOsm/kg
The osmolality of isosmotic solution is 300milliosmolar.
Glucose is a substance that will increase a solutions osmolality.
Osmosis? Osmolality? Osmolarity?
Osmotic Diuresis Water diuresis *High amount of H2O reabsoebed in *Normal absorption. PCT. *A lot of solutes are lost. *loss of solute amount is less. *Very high amounts of urine are *Amounts of urine produced are less produced. than that in osmotic diuresis. *Low medullary osmolality. *High medullary osmolality. *Normal *The limiting concentration gradient *The limiting gradient is not reached. for Na is reached at PCT. *Hyponatremia may occur. *Takes more time to get hyponatremia.
you seriously don't know this??
Henles loop
560mosmol/L
increased plasma osmolality
lower the osmolality of the blood
ADH, anti-diuretic hormone.