SESSION 2 BLOOD GAS ANALYSIS AND OSMOMETRY Lab Report

SESSION 2 BLOOD GAS ANALYSIS AND OSMOMETRY - Lab Report Examplerescent molecule, it has to turn on through an optical isolator( black coating) to prevent interference by unspecific light with the light staining system.Os molality measures the total number of osmotic eachy active particles in a solution and is equal to the sum of the molalities of all the solutes present in that solution. The four colligative properties are changed by the dissolving of the solute in solvent.Osmolarity refers to osmoles per litre, whilst osmolality refers to osmoles per kg water( There is a slight difference between plasma molality and molarity because of the non-acqueous components present such as proteins and lipids that run up about 60% of the total volume. Thus serum is only 94% water and the molality of a substance in serum is about 6% higher than its molarity. Molality is preferred because it is fissiparous of temperature).The osmolality of physiological fluids is mainly determined by small m olecules that are present in high concentrations. For deterrent example in serum, sodium, potassium, chloride, bicarbonate, urea and glucose are the only components present in high enough concentrations to individually claim the osmolality. Together these make up over 95% of total osmolality of serum. Larger serum molecules generate subatomic to the overall osmolality. A useful estimate of the osmolality is calculated fromThe difference between the measured and the calculated osmolality is cognize as the osmolar gap. If there are unmeasured osmotically active species present then these will addition the gap. The normal osmolar gap is up to 10mmol/L and values in excess of this usually indicate the front of an exogenous agent. The most common is ethanol, but methanol, the ethylene glycol, acetone and isopropyl alcohol will also contribute if present.Different causes of hyponatraemia can be distinguished by serum osmolality measurement. It is increased in hyperosmolar hyronatra emia(eg hyperglycaemia), normal in psuedohyponatraemia and decreased in