Lab Practical Formulas

Question 1

RBC validity

Answer 1

<25

Question 2

WBC validity

Answer 2

<15

Question 3

RBC total in macroliters

Answer 3

• Average of chambers x 10,000
• Or just move decimal place to the left 2 places (903 -> 9.03)

Question 4

WBC total in macroliters

Answer 4

Average of chambers x 1,000 / 9

Question 5

Platelet total

Answer 5

Average of 10 random fields x 15,000

Question 6

MCV

Answer 6

PCV x 10 / Hemoglobin count

Question 7

MCH

Answer 7

Hemoglobin x 10 / RBC count

Question 8

MCHC

Answer 8

Hemoglobin x 100 / PCV

Question 9

Reticulocyte count

Answer 9

• Count the number of reticulocytes in either 500 or 1,000
• Number of reticulocytes x 100 / 500 or 1,000 (depending on how many you count)
• Don’t forget to include a decimal place! (ex: 1.0 %)

Question 10

WBC Corrected count

Answer 10

• If no NRBC’s: WBC total x 1,000 = Corrected count
• If NRBC’s: Uncorrected WBC count x 100 / 100 + NRBC counted = Corrected count

Question 11

Answer 11

Band cell

Question 12

Answer 12

Toxic neutrophil

Question 13

Answer 13

Neucleated RBC

Question 14

Answer 14

Reticulocyte