# Situation: A nurse works in the newborn nursery and the neonatal intensive care unit (NICU) of a government hospital. She is responsible for newborn screening and for the unit's newborn screening records. A preterm infant born at 33 weeks has been in the NICU since birth and is now 4 days old and stable. Newborn screening has not yet been done. A packed red blood cell transfusion is ordered for this afternoon. What should the nurse do about the screening sample?

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> subject: Nursing Practice II — Maternal and Child Health Nursing

## 문제

Situation: A nurse works in the newborn nursery and the neonatal intensive care unit (NICU) of a government hospital. She is responsible for newborn screening and for the unit's newborn screening records.

A preterm infant born at 33 weeks has been in the NICU since birth and is now 4 days old and stable. Newborn screening has not yet been done. A packed red blood cell transfusion is ordered for this afternoon. What should the nurse do about the screening sample?

## 보기

1. Report the screening as missed because the time limit has passed
2. Collect the sample today, before the transfusion is started **✔ 정답**
3. Defer the sample until the infant moves to the regular nursery
4. Collect the sample after the transfusion, once the infant is stable

**정답: 2**

## 해설

Two rules apply at once. Under RA 9288, infants in intensive care may have the sample collected by day 7 of life, so a 4-day-old NICU infant is still within the allowed period. The sample should also be collected before a blood transfusion, because donor blood can alter the screening results.

## 심화 해설

Clinical situation A preterm infant born at 33 weeks is now 4 days old in the NICU and stable. Newborn screening has not been done, and a packed red blood cell transfusion is scheduled for this afternoon.

Core reasoning Two rules operate together here. First, the timing rule: under RA 9288, an infant admitted to intensive care may have the screening specimen collected up to day 7 of life. A 4-day-old NICU infant is therefore still well within the allowable window, so the screening is not missed. Second, the transfusion rule: the sample must be obtained before any blood transfusion is given, because transfused donor blood can dilute or replace the infant’s own analytes and produce misleading screening results.

Why transfusion timing matters Newborn screening measures metabolites, enzymes, and endocrine markers from the infant’s own dried blood spot. When donor red blood cells are transfused, the circulating blood becomes a mixture of the infant’s blood and donor blood. Donor blood contains adult levels of many analytes and enzymes, and it also dilutes the infant’s endogenous markers. For disorders detected through enzyme activity or amino acid patterns, this can mask a true abnormality or create a false elevation. Collecting the sample before the transfusion preserves the infant’s own metabolic profile and keeps the screen valid.

The evidence supports this concern. One study examining pancreatitis-associated protein (PAP) in cystic fibrosis screening found that blood transfusion was among the variables investigated for its influence on marker concentration [2]. More broadly, prematurity itself alters levels of amino acids, enzymes, and endocrine markers obtained through newborn screening, which is why timing and collection conditions must be controlled carefully in preterm infants [3]. The AAP newborn screening fact sheets also emphasize that specimen collection conditions affect the reliability of screening results [1].

Watch out! Do not interpret “stable at 4 days old” as a reason to wait. Stability is not the deciding factor; the transfusion is. If the transfusion proceeds before collection, the sample may no longer reflect the infant’s own metabolic state.

Key point! For NICU infants, the collection window extends to day 7 of life, but the pre-transfusion requirement overrides any temptation to defer. When a transfusion is ordered, collect the screening sample first—even if it means doing it earlier in the day than originally planned.

| Option | Clinical judgment | Why correct or incorrect |
| --- | --- | --- |
| 1. Report as missed | Incorrect | A NICU infant at day 4 is within the extended day-7 window under RA 9288; the screening is not late. |
| 2. Collect today, before transfusion | Correct | Preserves the infant’s own analyte profile and stays within the allowable collection period. |
| 3. Defer until regular nursery | Incorrect | Unnecessary delay; the infant is eligible for collection now, and waiting risks transfusion contamination or exceeding the window. |
| 4. Collect after transfusion | Incorrect | Donor blood can alter enzyme, amino acid, and endocrine marker levels, invalidating the screen. |

Nursing priority The nurse should coordinate with the NICU team to obtain the heel-prick specimen before the packed red blood cell transfusion is started, document the collection time and the infant’s NICU status, and note that the sample was collected prior to transfusion. This sequence protects the integrity of the screening result while still meeting the legal timing requirement for intensive care admissions.References (research sources)

- [1]Newborn screening fact sheets.Research articleKaye CI, Committee on Genetics, Accurso F, La Franchi S, Lane PA, Hope N (2006) · DOI: 10.1542/peds.2006-1783

- [2]The influence of sex, gestational age, birth weight, blood transfusion, and timing of the heel prick on the pancreatitis-associated protein concentration in newborn screening for cystic fibrosis.Research articleVernooij-van Langen AM, Loeber JG, Elvers B, Triepels RH, Roefs J, Gille JJ (2013) · DOI: 10.1007/s10545-012-9498-6

- [3]Metabolomics of prematurity: analysis of patterns of amino acids, enzymes, and endocrine markers by categories of gestational age.Research articleWilson K, Hawken S, Ducharme R, Potter BK, Little J, Thébaud B (2014) · DOI: 10.1038/pr.2013.212

## 임상 시나리오

Newborn Screening Before TransfusionRA 9288 timing and transfusion interference
For NICU-admitted infants, RA 9288 permits collection up to day 7 of life. A 4-day-old stable preterm infant is still within the allowable window.

The sample must be collected before any blood transfusion. Transfused donor red cells can dilute or replace the infant's own analytes and enzymes, causing false-negative or false-positive screening results.

CautionDo not defer collection until after transfusion or until transfer to the regular nursery. Collect the dried blood spot today, before the transfusion is started, to preserve the infant's own metabolic profile.

## 핵심 개념

- **RA 9288** — Newborn Screening Act of 2004 in the Philippines, which mandates screening and defines timing rules, including extended windows for NICU infants.
- **Newborn Screening** — A public health program that tests newborns for certain genetic, metabolic, and endocrine disorders using a dried blood spot.
- **Packed Red Blood Cell Transfusion** — Administration of concentrated donor red cells, which can alter the infant's blood analyte levels and interfere with screening accuracy.
- **Dried Blood Spot** — A sample collection method where blood is blotted onto filter paper and dried for laboratory analysis.
- **NICU** — Neonatal Intensive Care Unit, where admitted infants may have newborn screening deferred up to day 7 of life under RA 9288.

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