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