24 Questions
What is the composition of capillary specimens?
A mixture of arterial, venous, and capillary blood
When is capillary puncture an appropriate method for adults and older children?
When there are no accessible veins or available veins are fragile
Why is capillary puncture the preferred method for obtaining blood from infants and young children?
Because it does not cause damage to veins and surrounding tissues
What is a reason why capillary blood is preferred for certain tests?
It is the preferred specimen for newborn screening tests
Why is capillary puncture a preferred method for patients with thrombotic or clot-forming tendencies?
Because it reduces the risk of clotting
What is a common use of capillary blood in point-of-care testing (POCT)?
Glucose monitoring
What is the recommended depth of incision for adults?
< 2.5 mm
Why is it important to warm the site before collecting a blood sample?
To increase blood flow
What is the primary purpose of using a gauze or gauze-type pad?
To wipe away the first blood drop
What is the recommended order of draw for capillary specimens?
EDTA, additive, serum
What is the maximum temperature of the water used for warming devices?
42°C
What should be done when venous blood is collected by syringe and put into microcollection containers?
Label it as venous blood
What is the primary reason for warming the site when collecting blood specimens?
To increase arterial flow into the area
Why is the first drop of blood typically wiped away?
Because it may contain excess tissue fluid and alcohol residue
What is the term used to describe a specimen obtained from a warmed site?
Arterialized
What is the proper procedure after puncturing the site?
Wipe away the first drop of blood and discard the lancet
What is the primary purpose of microhematocrit tubes?
To perform manual hematocrit determinations
What should be done with the used and contaminated materials?
Dispose of them
What is the final step in the procedure?
Transport the specimen to the laboratory
What is the purpose of sealants in microhematocrit tubes?
To seal one end of the tube
What is the recommended site for capillary puncture on adults and children older than 1 year?
The palmar surface of the distal or end segment of the middle or ring finger
Why should capillary puncture not be performed on the fingers or earlobes of newborns or infants under 1 year of age?
According to CLSI standards
What is the purpose of warming the site before capillary puncture?
To increase blood flow to the area
What is the difference between heparin and nonadditive microhematocrit tubes?
Heparin tubes are coated with heparin, while nonadditive tubes are not
This quiz covers the composition of capillary specimens, indications for capillary puncture, and its applications in adults and older children. It discusses the mixture of arterial, venous, and capillary blood, along with interstitial fluid and intracellular components.
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