middle of heel
Because of abundant capillary flow.
The recommended site for heel punctures is the lateral (outside) or medial (inside) plantar surface of the heel. In small or premature infants, the heel bone (calcaneus) may be no more than 2.0 mm beneath the skin surface and no more than half this distance at the posterior curvature of the heel. Puncturing deeper than 2.0 mm on the plantar surface of the heel of small infants may, therefore, risk bone damage. When using incision devices, puncturing the heel at a 90' angle to the length of the foot is recommended.5 Such incisions create a 'gap' puncture (one which opens when pressure is applied) and further enhance blood flow. For infants, punctures must not be performed on: The posterior curvature of the heel. The central area of an infant's foot (area of the arch). Punctures to this area may result in injury to nerves, tendons, and cartilage. The fingers of a newborn or infant less than one year old. Earlobes.
The depth of penetration is greater than the recommended 2.0mm for heel incision devices. Run the risk of nerve damage. In addition, 2.8mm lancet will not produce enough blood for the PKU, etc. testing requirements, Lastly, a puncture wound is typically of "lower quality sample" due to the puncture vs incision wound type.
Puncturing the posterior curvature of the heel can damage underlying structures, such as nerves, blood vessels, and tendons, leading to complications like pain, infection, or impaired mobility. This area is also rich in sensitive tissue, making it prone to excessive bleeding and prolonged healing. For safety and to ensure accurate blood sampling, it's essential to puncture the heel in designated areas, typically the lateral or medial aspects, where the risk of injury is minimized.
2.0mm
The most common site to draw blood from an infant is the heel, specifically the lateral or medial plantar surface. This area is preferred due to its rich blood supply and minimal risk of injury to the infant.
Usually the heel.
Water can get in your heel through blisters caused by friction between your skin and footwear, which creates a pocket of fluid. It can also occur if there's a puncture or break in the skin that allows water to enter. Additionally, in some cases, swelling from injury or inflammation may create a sensation of fluid in the heel area. Proper footwear and care can help prevent these issues.
Dermal puncture refers to a technique used to obtain capillary blood samples by pricking the skin using a lancet or needle. It is commonly done on the finger, heel, or other suitable site for blood collection in medical settings such as hospitals, clinics, or laboratories.
Posterior Curve >:)
The Clinical and Laboratory Standards Institute (CLSI) recommends a maximum depth of heel puncture not to exceed 2.0 mm. This guideline is aimed at minimizing the risk of injury to the underlying structures, such as bones and nerves, especially in neonates and infants. Proper technique and adherence to this depth are crucial for safe and effective blood sample collection from the heel.