Normal Values - Surgical and Fluid Management

Surgical and Fluid Management

Normal Values

Blood volumes

·       Infant          80-85 ml/kg

 ·     Young child 80 ml/kg

·       Adult 70 ml/kg

Child’s body weight

·        Under 9 years: kg = 2*age + 9

·        9 and over: kg = 3*age

Electrolyte concentrations

 Extracellular       Intracellular

·        Sodium    140     12

·        Potassium           4          155

·        Magnesium        1          28

·        Chloride  100     10

·        Bicarbonate       28       10

·        Phosphate          1          105

Fluid Compartments and Control

·        Fluid Compartments in 70 Kg person:

o   Extracellular: 14 L

§  Intravascular: 3.5 L

§  Interstitial: 10.5 L

o   Intracellular: 28 L

·        Female: 55% water, male 60 % water

·        Control through ECF osmolarity:

o   Thirst

o   ADH: controls H2O excretion

o   Renal Na excretion: renin-angiotensin-aldosterone system