Simon Fraser - Newborn Screening - Department of Education and

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Newborn Screening

Dr Simon Fraser

Senior Paediatrician

(Latrobe Regional Hospital)

Neonatal Advisor

(Maternity and Newborn Clinical Network)

Newborn Screening

• Newborn screening (heel prick) test

• Hearing screening

• Newborn and 6 week examination

Screening – principles

• Serious disorder

• Sufficient frequency to be cost effective

• Cheap reliable screening test available

• Early treatment/intervention beneficial

• Consequences of non-treatment severe

Newborn screening (heel prick) test

• Not diagnostic

• Follow up testing required for abnormal results

• Not every affected child detected

• A screened condition that is suspected should always be tested formally

• Timing of sampling important

• Infant’s care giver will not be notified if the test is normal

Conditions screened

• Phenylketonuria (since 1965)

• Congenital hypothyroidism (since 1977)

• Cystic fibrosis (since 1989)

• Various inborn errors of metabolism (since

2002)

– MCAD (medium chain acyl CoA dehydrogenase deficiency most common

– Over 20 other rarer conditions

Pre-test procedure

• Parents given information leaflet

• Newborn screening test discussed

– Screening for many conditions

– May have to give second sample

– Most second samples within normal range

– Parents contacted if further testing necessary

• Consent on screening card (process if refused)

• All babies should be tested

Sample collection

• Information completed prior to test

• Sucrose for procedural pain management

• Blood collected 48-72 hours (not “day 2”)

• Capillary blood sampling preferable

• All 4 circles need to be completely filled

• Air dry in room temperature for 4 hours

• Avoid contamination

Special circumstances

• Total parenteral nutrition

• Palliated infants

• Having received blood products

• In utero blood transfusions

• Extremely low birthweight or premature infants

• Tables provide guidance for these

Further information

• Neonatal Handbook

– www.netsvic.org.au/nets/handbook

• RCH Clinical Guidelines

– www.rch.org.au/clinicalguide

• Victorian Clinical Genetic Services

– www.genetichealthvic.net.au

• Newborn Screening Laboratory

– www.vcgspathology.com.au/NBS

Hearing Screening

• Aims to identify babies born with hearing impairment even if not at risk

• Not diagnostic – positive result requires formal testing

• 1 in 1000 babies have permanent, moderate, severe or profound hearing loss at birth

• Technology easy, quick, reliable and immediate

Benefits of early diagnosis

• Improved language skills

• Education

• Social development

• Emotional development

Process

• Automated auditory brainstem response

(AABR)

• Painless

• Non-invasive

• Both ears checked simultaneously

• Takes about 4-7 minutes

Who is screened?

• Statewide

• Victorian Infant Hearing Screening Programme

• All babies within 1 month of age

• Most screened within 2 days of age (can be as young as 6 hours)

• Can be done after discharge

• Can be done down to 34 weeks (but usually closer to discharge)

Risk factors for hearing loss

• Meningitis/encephalitis

• Jaundice requiring exchange transfusion

• Ventilation > 5 days

• Aminoglycoside therapy > 3 days

• Congenital abnormality of head/neck

• Syndrome known to be related to hearing loss

• Close family history congenital hearing impairment

• Maternal infections during pregnancy (TORCH)

Referral to audiology (newborn)

• Diagnostic test

• Audiologist

• 4 - 6 weeks of age

• Referral made by VIHSP Coordinator

• Ongoing supports with diagnosis

• Reminders in green book at 2, 4 and 8 week visits (if not already done)

Referral to audiology (infant)

• VIHSP audiology referral form

• Can be used if need for assessment has changed

• Discuss hearing screen again at 8 months

• Refer if passed newborn screen with risk factor

• Refer if passed newborn screen with no risk factors but risk factor(s) now developed

Further information

• Neonatal Handbook

– www.netsvic.org.au/nets/handbook

• Victorian Infant Hearing Screening Program

– www.vihsp.org.au

• MCH Service

– www.education.vic.gov.au/mchservice

Newborn and 6 week examination equipment

• Stethoscope (cleaned)

• Ophthalmoscope

• Torch

• Tongue depressor

• Tape measure

Growth

Must measure:

• (Birth) weight

• (Birth) length

• (Birth) head circumference

• Plot for gestational age (usually known)

• Gestational age assessment charts available

• Need to correct for prematurity (if < 37/40)

Abnormal posture, tone, movements

• Floppy

• Stiff

• Asymmetry (Erb’s palsy)

• Jitters

• Seizures

Skull/scalp

• Abnormal shape – transient vs. fixed

• Fontanelles and sutures

• Lumps

– cephalhaematoma (common)

– congenital malformations (very rare)

• Plagiocephaly

Eyes

• Subconjunctival haemorrhage

• Conjunctivitis

• Sticky eye

• Red eye reflex – must be checked in all babies

– Cataracts

– White reflex

– Pigmented babies

• Unusually large eyes (glaucoma)

Mouth

• Asymmetry – facial palsy, congenital hypoplasia depressor anguli oris (wry smile)

• Natal teeth

• Tongue

• Cysts

• Cleft – only reliable way of excluding a soft palate cleft is to look

Neck

• Torticollis (sternomastoid ‘tumour’) – usually occurs later

• Cysts

• Webbing

• Fractured clavicle – lump +/- crepitus

Cardiac examination

• Apex beat

• Heaves

• Murmurs

• Femoral pulses

• (Four limb) blood pressure

• Heart failure – tachy x2 (-cardia, -pnoea) and megaly x2 (cardio-, hepato-)

Chest

• Signs of respiratory distress

• Colour

• Stridor

• Wheeze

• Symmetrical breath sounds

• Added sounds

– Wheeze

– Crackles

Abdomen

• Organomegaly (ballot kidneys)

• Distension

• Two vessel cord (association with renal anomalies)

• Omphalitis

• Umbilical hernia

• Anus (must actively look)

Genitalia

• Male:

– Hypospadias (dorsal hood, ventral meatus, chordee)

– Testes

– Hydrocoeles

• Female:

– Clitoromegaly

– Discharge (white, blood)

• Ambiguity

Lower limbs

• Hips:

– Risk factors – breech, first degree relative, other limb deformity, spina bifida

– www.ddheducation.com

• Feet:

– Talipes – equinovarus and calcaneovalgus

– Metatarsus adductus

• Toes:

– syndactyly

Examination - actively check

• Measure and plot

• Red eye reflex

• Cleft palate

• Murmurs

• Femoral pulses

• Hips

• Genital abnormalities and ambiguity

• Anus

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