The recommended depth of incision is about 2 mm, anything deeper will present the risk of nerve or bone damage and should be avoided. For both finger and heel sticks, the first drop of blood produced should not be used and should be wiped away since it contains interstitial fluid which aids in the clotting process.
What is the maximum acceptable width for a dermal puncture?
Capillary stick. What is the maximum acceptable depth for a dermal puncture on an adult? 3 mm.
What is a proper skin puncture procedure?
Perform the puncture on the most medial or most lateral portion of the plantar surface of the heel. Avoid a previous puncture site. Punctures must never be performed on the posterior curvature of the heel, the arch of the foot, or on fingers of a newborn or infant less than one year old.
What is the general site for skin puncture?
The distal end of the third or fourth fingeris 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.
What is the maximum depth of a heel stick?
The heel puncture should be done on the most medial or lateral portions of the plantar surface of the heel, not on the posterior curvature, to avoid the calcaneous. The lancets are designed to enter no deeper than 2-3 mm. If using a scalpel blade, the blade should enter the skin no more than 2-3 mm.
What is the recommended depth of a heel puncture on an infant?
Therefore, in order to avoid calcaneal puncture and the risk of osteochondritis, heel puncture in the newborn should be done: (1) on the most medial or lateral portions of the plantar surface of the heel; (2) no deeper than 2.4 mm; (3) not on the posterior curvature of the heel; and (4) not through previous puncture …
For which blood tests is dermal puncture not recommended?
Capillary punctures are not suitable for blood culture testing and most coagulation tests. specific tests only. Refer to online test directory for each tests collection requirements. Capillary Specimens may be used immediately for point-of-care testing.
How deep does a lancet puncture the skin quizlet?
A lancet is a small blade that can pierce 2 to 4 millimeters into the skin.
What is the appropriate puncture site for newborns and infants?
The heel is the recommended site for collection of skin puncture specimens on infants less than 1 year old or not walking. However, it is important that the puncture be performed in an area of the heel where there is little risk of puncturing the bone. Skin punctures must not be performed on fingers of newborns.
What is the angle of entry that should be used for a skin puncture?
The needle should form a 15 to 30 degree angle with the surface of the arm. Swiftly insert the needle through the skin and into the lumen of the vein.
Article first time published on
How full should the capillary tube be filled in skin puncture?
The Capillary Tube must be filled to the fill line (50µl) for accurate results. Check to make sure that the tube is free of gaps and bubbles. After collection, wipe the Capillary Tube with gauze pad (wipe downward).
How long should a capillary puncture site be warmed?
Warming the skin-puncture site (optional) can increase blood flow through the site. A warm, moist, white, clean towel at a temperature no higher than 42 degrees C. may be used to cover the site for at least three minutes. This technique increases the blood flow and does not burn the skin.
What is the best site for dermal puncture in adults?
puncture site. Recommended skin puncture sites are the finger for adult patients and older children and the heel for infants and younger children.
What are disadvantages of skin puncture?
Fainting or feeling lightheaded. 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)
Why is it best to perform a puncture on geriatric?
The infant group is most susceptible to blood depletion, while the geriatric group there is likely probability of vein fragility, difficulty in accessing veins, thrombotic tendencies, etc. Therefore, a dermal puncture is preferred over venipuncture where too much blood may be inadvertently collected.
What is the typical depth of the dermal subcutaneous junction in babies?
The major blood vessels of the skin are located at the dermal-subcutaneous junction, which in the newborn’s heel is 0.35 to 1.6 mm beneath the skin surface.
What is the typical depth of the dermal subcutaneous junction in adults?
The range of skin + subcutaneous tissue thickness at abdomen is 2.20-28.05 mm in males and 5.15-27.40 mm in females [Table 10].
Why is blood taken from a baby heel?
The ‘heel prick test’ is when a blood sample is taken from a baby’s heel so that the baby’s blood can be tested for certain metabolic disorders. The blood sample is taken using an automated device called a lancet. The lancet is used to make a small puncture on the side of the baby’s heel.
When are dermal punctures not appropriate?
Dermal punctures should not be performed on previously punctured sites or swollen sites. Excess tissue fluid may contaminate the specimen. If the patient is dehydrated or has poor circulation, it may be impossible to get a quality specimen.
What fingers are acceptable for capillary collection?
But what is an appropriate site? Finger – Usually the third or fourth finger is preferred in adults and children. 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.
Is dermal puncture the same as capillary?
The dermal puncture minimizes the amount of blood taken from the patient. This will be important to consider, especially with infants in an intensive care nursery. However, some laboratory tests require larger amounts of blood for testing; in these cases, capillary collection is not an option.
Which is the safest area for infant heel puncture?
The safe area for heel puncture in an infant is: The most medial and lateral portion of the plantar surface.
What is the most acceptable puncture site for a 6 month old infant?
6 -12 months: lateral or medial planter surface of the heel is the preferred site, big toe or finger may be used Finger puncture capillary blood sampling is obtained from the lateral surface of finger near finger tip away from the nail bed. Puncture should occur across the fingertip, not parallel to it.
What is the most acceptable site for babies or infants?
The heel of the foot is the preferred site for dermal puncture and capillary blood collection for infants less than 12 months old.
When is a heel puncture used?
While fingers are the site of choice after infancy, heel sticks are appropriate for most babies, including premature infants, neonates, and even babies 4 to 7 months old. The only caveat is that babies discover other parts of their bodies, such as their feet and toes, as they grow older.
What type of blood is collected during a skin puncture quizlet?
Terms in this set (62) may also be used as an alternate method of blood collection for adult patient with whom venipunture procedure are too difficult. The blood specimen obtained during dermal puncture is a mixture of capillary blood, venous blood, and interstitual fluid (fluid between cells and tissue.)
What is the longest amount of time that a tourniquet should be left on a patient's arm during venipuncture?
Ideally, the tourniquet should be in place no longer than one minute to prevent hemoconcentration.
Where is the CLSI recommended puncture site for adults and children over 1 year of age?
The CLSI recommended site for capillary puncture on adults and children older than 1 year is palmar surface of the distal or end segment of the middle or ring finger of the non dominant hand.
Why should the MA wipe the first drop of blood from puncture site?
The first drop contains excess tissue fluid and must be wiped away. the finger. blood or cause bruising.
How do you properly warm the site of puncture?
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.
What is the order of draw?
The “Order of Draw” is designed to eliminate the possibility of cross contamination that may result in erroneous results. It is based on CLSI Procedures for Collection of Diagnostic Blood Specimens by Venipuncture; Approved Standard Sixth Edition, October 2007.
