What does warming a site for skin puncture do? Before capillary puncture is performed, the site may need to be warmed in order to
increase arterial blood flow to the puncture area
. There are several commercially available thermal packs also known as “heel warmers”, but a towel soaked in warm water can also do the trick. Heat should be applied for 3-5 minutes.
What is the purpose of warming the site for capillary puncture?
Warming the site will
increase blood flow, making it easier to collect the specimen
. b. As the specimen is being collected, ensure the blood is not running or smearing on the skin surface.
Why do you warm a site for skin puncture?
NOTE: It may be necessary to warm the skin puncture site
to increase blood flow to the site
. A warm, moist towl (or other warming devices) at a temperature no higher than 42
o
C may be used to cover the site for three to five minutes.
When warming the site for a skin puncture the warming device should not be higher than?
Warming the skin puncture site: If the finger or heel is cold to the touch, pre-warming the site for a few minutes with a warm compress or commercial heel warmer will increase the flow of blood through the capillary beds. The site should not be warmed to a temperature higher than
42EC
.
What does squeezing the skin puncture site do to the specimen?
Edematous patients may contribute significant tissue fluid to the sample. Excessive squeezing
may cause hemolysis or introduce tissue juices into the specimen
. Partial clotting at the site of the wound may cause consumption of some of the cellular elements, especially platelets.
What is the purpose of warming the site before skin puncture quizlet?
What is the purpose of warming the site before skin punctures? It
increases blood flow up to 7 times
.
Why do you wipe off the first drop of blood in capillary puncture?
Adult patients
Wipe away the first drop of blood
because it may be contaminated with tissue fluid or debris (sloughing skin)
. Avoid squeezing the finger or heel too tightly because this dilutes the specimen with tissue fluid (plasma) and increases the probability of haemolysis (60).
Why must the puncture site not be squeezed after a finger stick?
NOTE: Do NOT squeeze or apply strong repetitive pressure to the site. This
may result in hemolysis or increase tissue fluid in the blood causing incorrect glucose results
.
Why is it important not to penetrate the skin too deeply when performing a skin puncture?
Why is it important not to penetrate too deeply when performing a skin puncture?
The bone may be penetrated, which can result in osteochnodritis or osteomyelitis
.
What is the general site for skin puncture?
The distal end of the third or fourth finger
is the most commonly used site. The very tip of the finger should not be punctured because there is a greater chance of puncturing bone as the bone is close to the skin surface.
Which is the most correct method for performing a capillary puncture?
Which is the most correct method for performing a capillary puncture?
Squeeze the finger to get an adequate blood sample
.
What is the difference between a skin puncture and venipuncture?
| Pros Cons | potentially less traumatic to the patient greater potential for patient injury |
|---|
Which of the following is the correct temperature of heel warming device?
| Question Answer | the temperature of heel warming devices should not exceed 42 degrees celius | which of the following is the medical term for a finger bone phalanx | all of the following are required characteristics of capillary puncture lancets EXCEPT color-coding by width of blade |
|---|
Why are the thumb and little finger not pricked for blood?
The thumb has a pulse and is likely to bleed excessively. The index finger can be calloused or sensitive and
the little finger does not have enough tissue to prevent hitting the bone with the lancet
.
What is the major cause of specimen rejection?
Samples in incorrect containers
(e.g. cervical cytology must be a ThinPrep vial; urine cytology must be in a uricyte container). Insufficient sample received. No sample received. Labelling or form issues (mislabelled/unlabelled/no forms/no clinical information).
When performing a skin puncture on the finger you should?
When performing a fingerstick, the phlebotomist should
puncture either side of the fleshy pad of the middle or ring finger, but not the extreme side of the finger
. The exact center of the fleshy pad or the tip of either finger should also be avoided.
What is the best site for capillary puncture in an infant quizlet?
– Ideal site in infants is the
medial or lateral plantar surface of the heel
, with a puncture no deeper than 2 mm beneath the plantar heel skin surface and no more than half this distance at the posterior curve of the heel.
Why is the first drop of blood wiped away quizlet?
Why must the first droop of blood from a capillary puncture be wiped away?
To remove tissue fluid
.
Which of the following is normally a proper site for finger puncture on an adult *?
| Question Answer | Which of the following patient conditions would make capillary puncture a good choice for specimen collection Iatrogenic anemia | Which of the following is normally a proper site for finger puncture on an adult distal segment of the middle finger |
|---|
How long should a capillary puncture site be warmed?
Before capillary puncture is performed, the site may need to be warmed in order to increase arterial blood flow to the puncture area. There are several commercially available thermal packs also known as “heel warmers”, but a towel soaked in warm water can also do the trick. Heat should be applied for
3-5 minutes
.
Do I have to wipe the first drop of blood?
The first drop of blood can be used for self-monitored glucose testing, but only after washing hands. If washing hands is not possible and they are not visibly soiled or exposed to a sugar-containing product, it is acceptable to use the second drop of blood after wiping away the first drop.
Why is ring finger preferred for pricking?
The middle or ring finger is preferred as
having the greatest depth of tissue beneath the skin and hence offering the least chances of injury
. The thumb or index finger may be more likely to be calloused or scarred, as well as being much more sensitive, making the procedure more painful.
What is excessive massaging or squeezing of the finger should be avoided?
Excessive massaging or squeezing of the puncture site should be avoided in order
to prevent hemolysis, contamination of the blood with interstitial and intracellular fluid, and obstruction of blood flow
.
What should the phlebotomist do with the first drop of blood after a finger stick is performed?
Blot the first drop of blood on a gauze pad and discard pad in appropriate biohazard container. Apply a sterile adhesive bandage over the puncture site. Put on powder-free gloves
.
How deep does a lancet puncture the skin?
A lancet is a small blade that can pierce 2 to 4 millimeters into the skin. The puncture is shallow, but it will produce a few drops of capillary blood that can be used for testing.
What vein should be avoided?
While hand veins may be utilized for blood draws and intravenous infusions,
veins in the feet and legs
should be avoided for adults. Drawing from these sites can cause blood clotting and hemostasis.
Why should the tourniquet not be applied longer than 2 minutes?
A prolonged tourniquet time
may lead to blood pooling at the venipuncture site, a condition called hemoconcentration
. Hemoconcentration can cause falsely elevated results for glucose, potassium, and protein-based analytes such as cholesterol.
Can you use the same needle twice to draw blood?
Healthcare providers (doctors, nurses, and anyone providing injections)
should never reuse a needle or syringe either from one patient to another
or to withdraw medicine from a vial. Both needle and syringe must be discarded once they have been used.
What are the complication of skin puncture?
Complications of cuts and puncture wounds
a wound infection
. a blood infection, or sepsis. gangrene. an amputation.
What is the best site for dermal puncture quizlet?
position puncture site
below the heart
to aid in adequate blood flow. the first drop of blood with gauze (tissue contamination). or heel to help blood flow. avoid milking the site.
What could have been the errors of the phlebotomist in performing dermal puncture?
What could have been the errors of the phlebotomist in performing dermal puncture?
Elderly patients, their veins are very fragile
. Before performing the dermal puncture,the phlebotomist should greet the patient and properly identify the patient.
Why is my blood black when drawn?
Deoxygenated blood is found in veins, which take blood from the body back to the lungs.
Blood drawn from a vein will appear dark red or even black
. So your mom probably had a doctor take blood from a vein. So the color is completely expected and normal given how our body’s circulatory system works.
What are the 3 main veins to draw blood?
The most site for venipuncture is the antecubital fossa located in the anterior elbow at the fold. This area houses three veins: the
cephalic, median cubital, and basilic veins
(Figure 1).
Does warming the site before performing a skin puncture increase the blood flow?
NOTE:
Warming the skin-puncture site with a warm moist cloth, or a heel warming device, for 3 minutes can increase blood flow through the site
. Allow the heel to air dry.
When warming a dermal puncture site The temperature should not exceed?
It may be helpful to warm the site before performing a skin puncture. Warming the site increases blood flow to that area. A warm, moist, clean towel at a temperature no higher than
42
o
C (107.6
o
F)
can be used. 3.
What are disadvantages of skin puncture?
Infection (a slight risk any time the skin is broken) Scarring (occurs when there have been multiple punctures in the same area) Calcified nodules (sometimes occurs in infants, but usually disappear by 30 months of age)
