Question 1:
PH = 7.475, that is mild alkalaemia.
pCO2 = 24 mmHg. So, we have respiratory alkalosis.
Category Archives: Lab Cases
Lab case 430
14-year-old girl, COVID day 2, presented with delirium. Her venous blood gases showed the following:
Ph = 7.475
pCO2 = 24 mmHg
Lab case 429 interpretation
Question 1:
PH = 7.31, that is mild acidaemia
PCO2 is high (51 mmHg). So we have respiratory acidosis. We don’t have enough information to decide if it is acute or chronic
Lab case 429
70 year old man presented with reduced level of consciousness.
His venous blood gas showed the following:
PH = 7.31
PO2 = 62 mmHg (on 6L O2)
Lab case 428 interpretation
Answers:
PH = 7.479, that is mild acidaemia.
HCO3 = 30 mmol/L (that is high). So, we have metabolic alkalosis.
Next we check the respiratory compensation for metabolic alkalosis. For That we use the following equation: Expected pCO2 = 0.7 x HCO3 + 20 (+/- 5).
Lab case 428
28 days old boy brought by his parents for multiple vomiting episodes. His venous gases showed the following:
PH = 7.479
pCO2 = 41 mmHg
pO2 = 34 mmHg
Lab case 427 interpretation
Question 1 answer
PH = 7.236, that is moderate acidaemia
HCO3 = 12.5 mmol/L. So we have metabolic acidosis.
Next we need to calculate the compensation and the the anion gap.
Lab case 427
21 year old man presented to ED with fatigue and weakness. His blood gases showed the following:
PH = 7.236
PCO2 = 30 mmol/L
Lab case 426 interpretation
Answers:
PH = 7.415, this is within normal range. slightly more to the alkelaemic side.
pCO2 = 34 mmHg, that is slightly low, this patient is hyperventilating. (Normal pCO2 is 40 mmHg on arterial blood and 48 mmHg on venous blood).
Lab case 426
60-year-old women presented to the emergency department compla ining of headache and fatigue. Her venous blood gases showed the following:
PH = 7.415
pCO2 = 34 mmHg