Osmolality

Question 0

Unit for osmolality

Answer 0

Osmoles per kilogram of water

Question 1

What is a colligative property?

Answer 1

Property of solution influenced by the number of molecules and not the individual identity of the molecule

Question 3

Normal values for serum osmolality

Answer 3

275-295 mmol/kg

Question 4

What organ regulates the osmolality level inside the body ( be specific)

Answer 4

Hypothalamus

Question 5

How does the body regulate the osmolality level

Answer 5

Thirst or secretion of anti diuretic hormone (ADH)

Question 6

In healthy patients, what is the expected result of measured osmolality vs calculated osmolality?

Answer 6

Measured osmolality = Calculated osmolality

Question 7

4 types of colligative property?

Answer 7

Boiling point, freezing point, vapor pressure and osmotic pressure

Question 10

Effect of ingestion of water to osmolality

Answer 10

Osmolality will decrease

Question 11

Method utilized to measure the dissolved particles in the solution

Answer 11

Osmometry

Question 12

What is osmolal gap?

Answer 12

Represents the difference between the measured and calculated osmolality

Question 13

Types of osmometry ( give 3)

Answer 13

1. Serum and urine osmolality
2. Freezing point depression osmometry
3. Vapor pressure depression osmometry

Question 14

Type of osmometry useful in assessing electrolyte disorder and acid base status

Answer 14

Serum and urine osmolality

Question 16

The result of osmolality levels when ADH is produced inside the body

Answer 16

Increased levels of osmolality due to the water retention action of ADH

Question 17

Type of osmometry wherein the evaporation of the water is decreased due to the presence of solute particles in the solution

Answer 17

Vapor pressure osmometry

Question 18

Normal value for osmolal gap

Answer 18

Should be less than 15

Question 19

Relationship of decrease in temperature and the number of particles in the solution present

Answer 19

Directly proportional

Question 20

In vapor pressure osmometry, what is the relationship between the osmolality of a solution and the vapor pressure?

Answer 20

Inversely proportional ( pag mataas ang vapor pressure, low ang osmolality)

Question 21

Reasons for osmolal gap (give 3 reasons)

Answer 21

1. Excess production of Beta hydroxybutarate
2. Ingestion of toxins (ethylene glycol)
3. Ingestion of large amounts of alcohol

Question 22

Unit for serum osmolality?

Answer 22

millimoles per kilogram ( mOsm/kg)

Question 24

Major molecules measured by serum and urine osmolality?

Answer 24

Sodium, Chlorine , Urea and Glucose

Question 25

Particles in a solution cause the freezing point of pure water to be decreased.

Answer 25

Freezing point depression osmometry

Question 27

What is osmolality?

Answer 27

Number of dissolved particles in a solution

Question 30

Formulas used to calculate osmolality (give 2)

Answer 30

1.86Na + glucose/18 + BUN/2.8 + 9 = mOsm/kg

2Na + glucose/20+ BUN/3.0 = mOsm/kg