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Blood Components Quiz

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Questions and Answers

What does a decrease in Mean Cell Volume (MCV) indicate?

Normal-sized red blood cells

Presence of macrocytes

Presence of microcytes (correct)

Increased hemoglobin concentration

Which formula correctly calculates the Mean Cell Hemoglobin (MCH)?

MCH = $rac{Hct}{RBC ext{ ct.}} imes 10$

MCH = $rac{Hb}{Hct} imes 100$

MCH = $rac{Hb}{RBC ext{ ct.}} imes 10$ (correct)

MCH = $rac{Hct}{Hb} imes 10$

What is the reference range for Mean Cell Hemoglobin Concentration (MCHC)?

80 to 100 g/dL

30 to 40 g/dL

31 to 37 g/dL (correct)

26 to 32 g/dL

Which of the following conditions is associated with an increased MCHC?

<p>Hereditary spherocytosis</p> Signup and view all the answers

What occurs when the MCHC result exceeds 37 g/dL?

<p>The calculation should be rechecked</p> Signup and view all the answers

Study Notes

Hemoglobin and Hematocrit

A patient with 8.0 g/dL hemoglobin has a hematocrit expected range of 21% to 27%.

Erythrocyte Indices

Mean Cell Volume (MCV)

MCV is the average volume of an individual red blood cell (RBC).
Formula: MCV = (Hct / RBC count) x 10
Reference range: 80 to 100 femtoliters
High MCV = macrocytes
Normal MCV = normocytes
Low MCV = microcytes

Mean Cell Hemoglobin (MCH)

MCH is the average weight or amount of hemoglobin in an individual RBC.
Formula: MCH = (Hb/RBC count) x 10
Reference range: 26 to 32 picograms
High MCH = possible falsely elevated Hgb
Low MCH = falsely lowered Hgb

Mean Cell Hemoglobin Concentration (MCHC)

MCHC is the average concentration of hemoglobin in the average RBC.
Formula: MCHC = (Hb/Hct) x 100
Reference range: 31 to 37 g/dL or %
High MCHC = hereditary spherocytosis
Normal MCHC = normochromic
Low MCHC = hypochromic

Reminders

RBCs cannot accommodate more than 37 g/dL Hb.
MCH and MCHC have limited clinical value, but useful for quality control.

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Description

Test your knowledge on hemoglobin, hematocrit, and erythrocyte indices, including Mean Cell Volume (MCV), Mean Cell Hemoglobin (MCH), and Mean Cell Hemoglobin Concentration (MCHC). This quiz covers the formulas, reference ranges, and implications of various blood component measurements. Ideal for students in healthcare or biology.