What are the normal ranges and key considerations for common blood tests like ESR and Bleeding Time, and what are the risks associated with blood transfusions?

Here are the answers from your document:

Question C (from previous section): Why must the ESR tube be kept perfectly vertical?
Even a slight tilt ($3^\circ$) can significantly increase the sedimentation rate, leading to a false-positive result.

Station 10: Bleeding Time (IVY vs. DUKE)

• Question A: Why is the Ivy Method considered more accurate than the Duke Method? Because it uses a standardized pressure ($40 \text{ mmHg}$) and a standardized site, making it more reproducible.

• Question B: Name one drug a patient might be taking that would prolong the Bleeding Time. Aspirin (or any NSAID that inhibits platelet aggregation).

• Question C: What is the normal range for Bleeding Time using the Ivy method? 2 to 9 minutes (ranges vary slightly by lab manual, check your local standard).

Station 11: Blood Grouping Hazards

• Question A: What is the most dangerous complication of a mismatched ABO blood transfusion? Acute Hemolytic Transfusion Reaction.

• Question B: Define "Agglutination" and distinguish it from "Coagulation." Agglutination is the clumping of particles (antigen-antibody reaction). Coagulation is the chemical process of forming a fibrin clot.

• Question C: Why do we use a white tile for the grouping practical? To provide maximum contrast so that the red clumps (agglutinates) are easily visible against the white background.