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Hema

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Questions and Answers

Hgb formula

RBC x 3

Hct (%) formula

Hgb x 3

MCV formula

(Hgb (%) x 10) / RBC count

MCV normal value

80-100 fL Signup and view all the answers

MCH formula

(Hgb (g/dL) x 10) / RBC count Signup and view all the answers

MCH normal value

26-32 pg Signup and view all the answers

MCHC formula

(Hgb x 100) / Hct (%) Signup and view all the answers

MCHC normal value

32-36 g/dL Signup and view all the answers

RDW formula

(SD ÷ MCV) x 100 Signup and view all the answers

RDW normal value

11.5 - 14.5 % sa adult and 14.2 - 19.9 sa newborn Signup and view all the answers

Poikilocyte (shape variation) grading 0-2

Normal Signup and view all the answers

2-10

+1 Signup and view all the answers

10-20

+2 Signup and view all the answers

20-50

+3 Signup and view all the answers

50

+4 Signup and view all the answers

Hematocrit layers

Fatty layer, plasma, buffy coat, packed RBC, clay, wax Signup and view all the answers

Hct centrifugation time

10 mins Signup and view all the answers

Hematocrit method

Adam's microhematocrit (10-15k x g for 5 mins) and Wintrobe's microhematocrit (2k-2300 x g for 3 mins) Signup and view all the answers

Sources of error

Overanticoagulation, overcentrifugation, undercentrifugation, trapped plasma (due to poikilocytes and false inc. in Hct) Signup and view all the answers

Hgb determination method

Cyanmethemoglobin using Drabkin's reagent, applicable except to sulfhemoglobin Signup and view all the answers