HEMA MIDTERMS COMPUTATIONS

Question 1

RBC Thoma Pipette Dilution

Answer 1

101-1/total amount of blood aspirated

Question 2

RBC Count (1:200)

Answer 2

no. of RBC x 10,000

Question 3

other RBC count formula

Answer 3

1. Ave. cell # x dilution factor / area counted x chamber depth
2. # of RBC x Area C.F x Depth C.F x Dilution C.F in 1/5 sq.mm

Question 4

WBC count (1:20)

Answer 4

Total # of cells in all 4 squares x 50

Question 5

OTHER formula for WBC

Answer 5

WBCs Counted x 10 x 20 / 4

Question 6

Dameshek’s Method

Answer 6

Platelets x RBC Count / 1,000

Question 7

Guy and Leake

Answer 7

Platelets per uL = Platelet x 5 x 10 x 100

Question 8

Rees and Ecker Method (platelet count)

Answer 8

No. of cells x Dilution Factor x Depth Factor / Area Factor

Question 9

Rees and Ecker Platelets/µL

Answer 9

Platelets Counted x 10 x 200 / 4

Question 10

Brecher-Cronkite Method

Answer 10

Platelets per uL = Platelet x 5 x 10 x 100

Question 11

Thrombocyte No. concentration

Answer 11

Platelet count x .01 = ______ x 10^9/L

Question 12

WBC Differential Count & WBC Absolute Count

Neutrophil

Answer 12

47-49
1.8 - 7.7 x 10^9/L

Question 13

WBC Differential Count & WBC Absolute Count

Lymphocyte

Answer 13

14-47
1 - 4.8 x 10^9/L

Question 14

WBC Differential Count & WBC Absolute Count

Monocytes

Answer 14

2-11
0 - .8 x 10^9/L

Question 15

WBC Differential Count & WBC Absolute Count

Eosinophils

Answer 15

0-7
0-.45 x 10^9/L

Question 16

WBC Differential Count & WBC Absolute Count

Basophil

Answer 16

0-2
0-.30 x 10^9/L

Question 17

WBC Differential Count & WBC Absolute Count

Stab or Band cell

Answer 17

0-7

Question 18

Hgb Concentration in Chemical Method

Answer 18

Iron content (mg/dL) / 3.47

Question 19

Cyanmethemoglobin

Answer 19

C test / C standard= A test/ A standard or C test = C standard x A test / A standard

Question 20

Wintrobe Hematocrit (QNS)

Answer 20

L1 x 100 / L2
L1 - height of red cell column
L2 - height of entire column

Question 21

Wintrobe Hematocrit (<5mL)

Answer 21

(Vol. of pRBCs/ Vol. of whole blood used) x 100

Question 22

Haden’s Modification

Answer 22

Hct % = vol of pRBCs x 20

Question 23

Haden’s Modification (<5mL)

Answer 23

Hct % = (vol of pRBCs / vol of whole blood used) x 100

Question 24

MCV

Answer 24

MCV = Hct/RBC Countx 10

Question 25

*

MCH

Answer 25

MCH = Hgb/RBC Count x 10

Question 26

MCH

MCHC

Answer 26

MCHC = Hgb/Hct x 100

Question 27

Rule of Three

Answer 27

Hemoglobin x 3 = Hematocrit ± 3
RBC x 3 = Hemoglobin ± 3

Question 28

%Reticulocyte

Answer 28

No. of reticulocytes x 100 / 1000

Newborn (within 2 weeks): 2-6%
Adults: 0.5-1.5%

Question 29

Absolute Reticulocyte Count

Answer 29

(Reticulocytes (%)/ 100) x RBC Count x 1000

RBC Count is in (x1012/L) format

Question 30

Retics/mm3

Answer 30

(% retics / 100) x RBC count in millions

Question 31

Reticulocyte No. Concentration

Answer 31

Retics/mmm3 x .001 = ___ x 10^9/L

Question 32

Corrected Reticulocyte Count

Answer 32

[Reticulocytes % x Hct (%)] / Normal Hct

Question 33

Retics/uL

Answer 33

Reticulocytes (%) / 100 x RBC Count

Question 34

Reticulocyte Production Index

Answer 34

CRC / Maturation days of Retics in blood

Question 35

Zeta Sedimentation Rate (ZSR)

Answer 35

ZSR% = (HCT (%) / Zetacrit) x 100