Saturday, November 15, 2008

Blood Gas Analysis - Review Questions

Name:

Clinical Chemistry 2 -Blood Gas Analysis



Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.

1.

Blood Gas Analysis is considered a routine test in clinical laboratories . This is because it is related to several common diseases.

2.

Partial pressure of oxygen (pO2) measurements determines the ability of the lungs to “oxygenate” the body.

3.

When computing for the pH values, carbonic acid is considered as dissolved carbon dioxide.

4.

The normal pH of arterial blood ranges from, 7.45-7.55.

5.

The normal ratio of carbonic acid to bicarbonate is 1:20.

6.

Respiratory alkalosis is usually demonstrated by increased blood bicarbonate levels.

7.

Hyperventilation causes acidosis because of the rapid excretion of carbon dioxide.

8.

When there is respirtory alkalosis, the kidneys will respond by increasing the exretion of bicarbonates.

9.

The best specimen for Blood Gas Analysis is heparinized blood.

10.

The lungs and the kidneys are the organs involved in maintaining normal blood pH.


Matching


a.
respiratory alkalosis
e.
all of the above
b.
respiratory acidosis
f.
none of the above
c.
metabolic alkalosis
g.
a & b only
d.
metabolic acidosis
h.
c & d only

11.

diarrhea

12.

bronchial asthma

13.

polyuria

14.

hypoventilation

15.

strenuous exercise

16.

carbon dioxide is involved

17.

bicarbonate is involved

18.

pH is 8.5 with a HCO3 value as 23 mmol/L

Problem

19.

A 20 year old female patient was admitted to the emergency ward. She complained of nausea, vomitting and polyuria. Her laboratory results were:
Hemoglobin - 13 mg/dL
White blood cells - 6,245 /cumm
FBS - 70 mg/dL
BUA - 3 mg/dL
BUN - 15 mg/dL
Serum creatinine - 1.2 mg/dL
TAG - 140 mg/dL
Cholesterol - 200 mg/dL
pCO2 - 38 mmHg
HCO3- 15 mmol/L

Answer the following questions:
1. What is the acid base status of the patient?
2. What are the abnormal results in her laboratory tests?
3. What is the pH of the blood?
4. What further tests can be performed?

Essay

20.

Discuss the compensatory mechanism of the body when there is metabolic alkalosis.




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