RBC Counting

Question 1

The red cell count is the number of red cells in _____.

Answer 1

1 cu.mm.

Question 2

The RBC Count is one of the tests that are used for _____.

Answer 2

Diagnosis of Anemia and Polycythemia

Question 3

Formula for RBC Count:

Answer 3

of RBC counted x area correction factor x depth correction factor x dilution factor

Question 4

Area used in the actual cell count:

Answer 4

1/5 mm^2

Question 5

Area correction factor:

Answer 5

5

Question 6

Depth of the counting chamber:

Answer 6

0.1 or 1/10mm

Question 7

Depth correction factor:

Answer 7

10

Question 8

Dilution:

Answer 8

1:200 or 1/200

Question 9

Dilution correction factor:

Answer 9

200

Question 10

Formula for RBC Count with values indicated:

Answer 10

of RBC Cells counted x 5 x 10 x 200 or # of RBC Cells counted x 10,000

Question 11

To diagnose Polycythemia or Erytheremia, the blood is drawn to _____ mark of the RBC pipette and the diluent up to _____.

Answer 11

0.3
101

Question 12

To diagnose Anemia, the blood is drawn to _____ mark of the RBC pipette and the diluent up to _____.

Answer 12

1
101

Question 13

Dilution factor for Polycythemia/Erythremia:

Answer 13

1/300 or 1:333

Question 14

Dilution factor for Anemia:

Answer 14

1/100 or 1:00

Question 15

Normal Value of RBC for Female:

Answer 15

3.6 - 5.6 x10^12/L

Question 16

Normal Value of RBC for Male:

Answer 16

4.2 - 6.0 x 10^12/L

Question 17

Normal Value of RBC at Birth:

Answer 17

5.0 - 6.5 x 10^12/L

Question 18

Physiologic Variation:

Answer 18

Increased count in dehydration
Increased count in exercise
Newborn children have higher count than adults
Women have lower counts than male
Individual living at higher altitude have higher counts

Question 19

Pathologic Variation:

Answer 19

Increased erythrocyte count in polycythemia
Increase in pulmonary tuberculosis and pulmonary fibrosis
Increase in acute poisoning
Decrease in anemia and after hemorrhages