Lab 1.1 Blood Cell Physiology Tests

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PhysioEx Blood Analysis Questions included

What does hematocrit measure? Why is that info valuable?

% of RBCs in blood

RBCs transport O2 so higher hematocrit the more RBCs available to carry O2

Would an individual suffering from aplastic anemia have higher or lower hematocrit than normal? Why?

Lower hematocrit b/c the bone marrow doesn't produce enough blood cells

What does sedimentation rate measure? Why is that info valuable?

The rate at which RBCs settle out the plasma when placed in a test tube

Some conditions identified by abnormal coagulation of RBCs (clump together)

Ex. myocardial infarction cause higher ESR

ESR for the menstruating female

ESR increases b/c of the loss of iron during menstruation

If patient complaining of chest pain, why might doctor order a ESR?

To see if the person is just experiencing chest pain or if they are having a heart attack

ESR is elevated during a heart attack (myocardial infarction)

What does a hemoglobin (Hb) test measure? Why info valuable?

Measures how much Hb is in RBCs

Useful for determining classification & causes of anemia

Does a male w/ polycythemia have a normal PCV to Hb? Do you think his RBCs contain enough Hb molecules? Why?

Yes, because there's increased RBCs & increased Hb so ratio is normal (3:1)

Why would you look at the PCV/Hb ratio?

If looking just at RBCs & there's an increase you may think there's a problem, but if Hb is increased then it's okay

What does blood typing measure? Why is info valuable?

Blood type determined by presence or absence of antigens A & B attached to surface of RBCs

It is important to prevent mismatch of blood transfusions

What antigen is present in blood if antibody A causes agglutination?

Antigen A

Why is type O considered to be the "universal donor"?

There are no antigens

What blood type is the "universal recipient"?

AB+

Anemia

Reduced O2 carrying ability of blood

Can result from low Hb or low RBC count

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