Which site is considered most suitable for taking a blood sample in newborns?

Bihar CHO -2019

Child Health Nursing (Pediatrics)

Easy

Appeared in: Bihar CHO -2019

Explanation

The heel is the preferred site for capillary blood sampling in neonates due to its rich vascular bed.
The specific recommended areas are the medial and lateral aspects of the plantar surface, which avoids the calcaneus bone, major nerves, and arteries.
This method is relatively safe and provides adequate blood volume for common newborn screening tests and other routine monitoring like blood glucose.
Warming the heel before the procedure increases blood flow, making collection easier and reducing the need for excessive squeezing, which can damage blood cells.

Option B: The fingers of a newborn are very small, and a puncture risks injuring the bone, nerves, or tendons. The distance from the skin surface to the bone is minimal.
Option C: The neck contains major blood vessels (carotid artery, jugular vein) and vital structures like the trachea. It is never used for routine blood sampling due to the high risk of severe injury.
Option D: The back is not a standard or appropriate site for blood collection as it lacks easily accessible, safe, and sufficiently vascular areas for this purpose.

Clinical Relevance

Nursing practice connection: Knowing Newborn blood sampling sites and procedure helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Proper site selection and technique for heel pricks are critical nursing skills to prevent complications like osteomyelitis (bone infection), nerve damage, and scarring in newborns.
Ensuring the heel is warmed before the procedure significantly improves blood flow, reducing the need for excessive squeezing which can cause hemolysis (rupture of red blood cells) and lead to inaccurate test results.
What if? If a newborn requires frequent blood glucose monitoring and the heels are already bruised or swollen (edematous), a venous or arterial sample drawn by a specially trained practitioner may be necessary instead of repeated heel pricks to avoid further tissue damage.

How to Approach the Question

Identify the core of the question: it asks for the 'most suitable' blood sampling site in a 'newborn'.
Recall standard pediatric nursing procedures. Think about the unique anatomy and safety considerations for neonates, who are not just small adults.
Evaluate each option based on safety and accessibility. The heel is a well-known site for newborn screening. The hands (fingers) are too small and delicate. The neck contains critical structures. The back is not a vascular site for sampling.
Select the option that balances ease of access with the lowest risk of harm. The heel prick is the established standard of care for this specific patient population.

Concept Tested & Keywords

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 778-780

E6 textbook of Applied Biochemistry and Nutrition & DieteticsHarbans Lal (pp 26-464 of 479) p. 221-223

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 847-849