Chapter 7.2, Problem 5RQ

Why are thick or dense smears less likely to provide a good smear preparation for microscopic evaluation?

Why is there a need to puncture the skin at 3mm depth in doing the Duke's bleeding time test?

Why is it important to remove first the alcohol from the site before performing the puncture?

Why is it a mistake to use the same syringe, even with new , sterile needles?

Why is skin contamination such a big problem in blood culture test?

Background introduction about blood smear

Preparation of smear

A patient has subcutaneous nfection and the specimen is submitted on a swab . Explain why this is an unacceptable collection method . How shoul he sample be collected ?

Why is a dermal (capillary) puncture performed so that the cut runs across the fingerprint lines? To prevent hemolysis To prevent the puncture from piercing too deep To direct the blood along the lines of the fingerprint To deliver the best possible blood flow