Blood Gas and pH measurements

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

What will diagnostic tests identify?

Back (Answer)

(and evaluate) dysfunction if patient’s history and physical examination reveal evidence of respiratory dysfunction

Front (Question)

one of the first test ordered to assess respiratory status because it helps evaluate gas exchange in lungs

Back (Answer)

Arterial blood gas *measures how well the person’s lung and kidneys are working and how well the body is using energy

Front (Question)

Any substance that can yield hydrogen (H+) or hydronium ion (H3O+) when dissolved in water

Back (Answer)

Acid release of proton or H+

Front (Question)

Substance that can yield hydroxyl ions (OH-)

Back (Answer)

Base ACCEPT proton or H+

Front (Question)

negative logarithm of the ionziation constant of an acid

Back (Answer)

pK or pKa

Front (Question)

pKa value of strong acids

Back (Answer)

Front (Question)

pKa value of strong bases

Back (Answer)

> 9 ^pKa ^pH

Front (Question)

It is the affinity of the acid whether or not to give out its H+

Back (Answer)

pKa

Front (Question)

negative logarithm of H+ concentration

Back (Answer)

pH represents hydrogen concentration *pH= pKa + log [base]/[acid]

#10

Front (Question)

combination of a weak acid and/or weak base and its salt

Back (Answer)

buffer *able to resist changes in pH

#11

Front (Question)

Effectiveness of buffer depends on

Back (Answer)

pK of buffering system pH of environment in which it is placed

#12

Front (Question)

Normal pH range, acidosis and alkalosis

Back (Answer)

Normal: 7.35-7.45 Acidosis: < 7.35 Alkalosis > 7.45

#13

Front (Question)

diagnostic procedure in which blood is obtained from an artery directly by an arterial puncture or accessed by a way of indwelling arterial catheter

Back (Answer)

Arterial Blood Gas

#14

Front (Question)

Arterial blood gas is only taken for (indications):

Back (Answer)

• To obtain information about patient ventilation (pCO2), oxygenation (pO2), and acid-base balance • To monitor gas exchange and acid-base abnormalities for patient on mechanical ventilator or not • To evaluate response to clinical intervention and diagnostic evaluation (oxygen therapy)

#15

Front (Question)

When is arterial blood gas most useful?

Back (Answer)

when a person’s breathing rate is increased or decreased when person has very high blood sugar levels, sever infection or heart failure

#16

Front (Question)

Components of ABG

Back (Answer)

pH pCO2 pO2 HCO3-

#17

Front (Question)

[Components of ABG] Measures hydrogen ion concentration in the blood, it shows blood acidity or alkalinity

Back (Answer)

pH normal value: 7.35-7.45

#18

Front (Question)

[Components of ABG] carried by the blood for excretion by the lungs, known as respiratory parameter

Back (Answer)

pCO2 It is the partial pressure of CO2 normal value: 35-45 mmHg

#19

Front (Question)

[Components of ABG] dissolved in the blood; reflects body’s ability to pick up oxygen from the lungs

Back (Answer)

pO2 (partial pressure of O2) normal value: 80-100 mmHg

#20

Front (Question)

[Components of ABG] metabolic parameter;; reflects kidneys ability to retain and excrete bicarbonate

Back (Answer)

HCO3- normal value: 22-28 mEq/L

#21

Front (Question)

T or F: The body constantly works to maintain a balance (homeostasis) between acids and bases

Back (Answer)

True

#22

Front (Question)

These are byproducts formed as cells use nutrients to produce energy

Back (Answer)

H+ and CO2

#23

Front (Question)

Where does Acid-base balance depend on?

Back (Answer)

regulation of free H+ *slight imbalances affect emtabolism and essential body functions

#24

Front (Question)

What conditions affect acid-base balance?

Back (Answer)

infection or trauma