## How do you calculate serum ethanol concentration?

The serum ethanol (mmol/L) was related to osmolal gap (mOsm/Kg) by the formula: Ethanol = 0.83 X osmolal gap. The factor 0.83 indicated that the behavior of ethanol in serum did not conform to that expected from ideal solutions. This equation accurately predicted serum ethanol in 32 additional samples (r = 0.988).

How do you calculate osmolarity of ethanol?

Our results demonstrated that the contribution of ethanol to serum osmolality can be calculated by dividing the serum ethanol level in mg/dl by 4.6.

### How is serum tonicity calculated?

The equation: Posm =2 [Na(+)]+glucose (mg/dL)/18+BUN (mg/dL)//2.8 is also the simplest and best formula to calculate plasma osmolality. The concentration of only effective osmoles evaluates effective osmolality or tonicity as: Eosm =2 [Na(+)]+glucose/18. The normal range of plasma tonicity is 275-295mOsm/kg of water.

What is ethanol 10 mg dL?

10 – 50 mg/dL. 0.01 – 0.05 g/dL. Mild euphoria, decreased inhibitions, diminished attention & judgement. 50 – 100 mg/dL.

## How do you calculate alcohol metabolism?

Thus we take the . 0302 BAC and subtract . 012 for one hour of metabolism and calculate that the estimated BAC at the end of one hour is . 0182 for a 128 pound male who has drunk a 12 ounce can of beer containing 4.5 percent alcohol by volume, assuming a conservative metabolic rate of .

How do you calculate serum osmolarity?

Specific therapies and toxins that affect an individual’s fluid balance should also be evaluated with serum osmolality. The 1975 Dorwart and Chalmers formula, serum osmolality = 1.86(Na) + (glucose/18) + (BUN/2.8) + 9 had been often used to calculate the plasma osmolality.

### How do you calculate osmolality of a solution?

Multiply the number of particles produced from dissolving the solution in water by the molarity to find the osmolarity (osmol). For instance, if your have a 1 mol solution of MgCl2: 1 x 3 = 3 osmol. Repeat multiplying the molarity by the number of particles for the other solution to find the osmolarity.

How do you calculate serum?

The 1975 Dorwart and Chalmers formula, serum osmolality = 1.86(Na) + (glucose/18) + (BUN/2.8) + 9 had been often used to calculate the plasma osmolality. In 1976, Smithline and Gardner, proposed to use serum osmolality = 2(Na) + glucose/18 + BUN/1.8 as a simpler formula.

## What is serum tonicity?

The serum tonicity is defined as the concentration of solutes that do not easily cross the cell membrane (effective osmoles). These solutes are primarily sodium salts in the extracellular space. As a result, serum sodium is used as a surrogate for assessing tonicity of the extracellular fluid.

How do you calculate osmolarity and osmolality?

Osmolarity and Osmolality

1. mOsmol/kg = n x mmol/L.
2. mOsmol/kg = (n x mg/dL x 10) ÷ mol wt (g)
3. mOsmol/kg = (n x mEq/L) ÷ valence.

### What is the formula for serum osmolality?

How do I calculate serum osmolality?

## What is serum sodium concentration?

Serum sodium concentration is the amount of sodium relative to the volume of water in the blood; it does not reflect total body sodium content. Hyponatremic and hypernatremic patients may have decreased, normal, or increased total body sodium.