RBC Indices lecture

What does MCV stand for and what does it measure?

MCV stands for Mean Corpuscular Volume and it measures the average size of red blood cells.

What is a normal range for MCV?

The normal range for MCV is 80 to 100 femtoliters.

What condition is indicated by a low MCV (less than 80)?

A low MCV is indicative of microcytic anemia.

What conditions can result in low MCV?

Iron deficiency anemia, sideroblastic anemia, and thalassemias can cause low MCV.

What does a high MCV indicate?

A high MCV indicates macrocytic anemia.

What types of macrocytic anemia are there?

Megaloblastic and non-megaloblastic anemias.

Name the vitamins associated with megaloblastic anemia.

Vitamin B12 and folate are associated with megaloblastic anemia.

How do alcoholic and burn-related non-megaloblastic anemia red cells appear?

They appear round and do not show hypersegmentation of neutrophils.

How is MCH calculated?

MCH is calculated as hemoglobin divided by red blood cell count in picograms.

What is the normal range for MCH?

The normal range for MCH is 27 to 31 picograms.

What does MCHC measure?

MCHC measures the average concentration of hemoglobin in a given volume of red cells.

What is the normal range for MCHC?

The normal range for MCHC is 320 to 360 g/L.

What is indicated by a high MCHC?

A high MCHC may indicate a hemolytic process or presence of spherocytes.

What can cause a falsely elevated MCHC?

Lipemia or agglutination of red blood cells can cause falsely elevated MCHC.

What does RDW stand for, and what does it indicate?

RDW stands for Red Cell Distribution Width and it indicates the variance in size of red blood cells.

What is a normal range for RDW?

A normal range for RDW is 11.5 to 14.5.

What is indicated by an elevated RDW?

An elevated RDW indicates a variation in red blood cell sizes.

What does polychromasia indicate?

Polychromasia indicates the presence of young and immature red blood cells.

What can you infer from a patient with low MCV and elevated RDW?

This could indicate iron deficiency anemia.

What is the 'Rule of Three' in hematology?

The 'Rule of Three' states that hemoglobin times three should equal red blood cell count.

How do you calculate hematocrit from RBC and MCV?

Hematocrit can be calculated as (RBC count × MCV × 10).

What hemoglobin count is generally considered critical?

A hemoglobin count below 80 g/L is considered critical.

What is the typical management for a patient with low hemoglobin and suspected iron deficiency?

To treat, iron supplementation via pills or infusions is typically considered.

What are the signs of anemia on a physical exam?

Symptoms can include pallor of the conjunctiva or inner eyelids.

What would likely indicate the need for a blood transfusion?

Hemoglobin levels around 40 g/L suggest a need for possible transfusion in acute settings.

What underlying condition could a 68-year-old male with numbness and tingling suggest?

It may suggest a vitamin B12 deficiency or other nutritional deficiency.

What do oval macrocytes suggest upon examination?

Oval macrocytes suggest the presence of megaloblastic anemia.

What is the relationship between hemoglobin level and oxygen delivery?

Lower hemoglobin levels lead to reduced oxygen delivery to tissues.

What can varying hemoglobin levels over time indicate?

Variations in hemoglobin levels can indicate changes in a patient’s anemia status.

What condition is most frequently associated with microcytic anemia?

Iron deficiency anemia is the most common microcytic anemia.

What laboratory tests are useful in evaluating anemia?

Iron studies, reticulocyte count, and vitamin level tests are useful.

What can the presence of spherocytes indicate?

The presence of spherocytes can indicate hemolytic anemia.

What is the significance of a hematocrit value of 0.28?

A hematocrit value of 0.28 indicates low red blood cell volume.

What are the units for measuring MCV?

MCV is measured in femtoliters (fL).

What does hypochromic mean in relation to red blood cells?

Hypochromic indicates that red cells have reduced hemoglobin content.

What can cause macrocytic anemia besides vitamin B12 deficiencies?

Liver disease, alcoholism, and certain medications can also cause macrocytic anemia.

What can cause solely elevated hemoglobin with normal MCH and MCV?

This could suggest dehydration or relative polycythemia.

At what MCHC level should immediate attention be given?

An MCHC level above 360 g/L warrants immediate attention.

What is a primary indicator of an ongoing hemolytic process?

An increased reticulocyte count indicates an ongoing hemolytic process.

In which type of anemia would you see target cells?

Target cells are often seen in liver disease or thalassemias.