Antenatal Intake Interview – Sarah

Personal Profile

• Name: Sarah

• Age: $30$ (turning $30$ next month)

• Marital status: Married to Paul (electrician)

• Residence: Purchased a house and relocated $12$ months ago for Paul’s work

Current Pregnancy

• Gravida $1$, Para $0$ → First pregnancy

• Conception: Occurred immediately after deciding to try; feels “very lucky” compared with friends who have taken longer

• Anticipation: Looking forward to the first-trimester scan to learn the baby’s sex

Medical & Surgical History

• No prior hospital admissions

• No known allergies

• No chronic medications

  • Only medication/supplement: Elevit® (pregnancy multivitamin) started pre-conception

Lifestyle & Health Behaviours

• Active hobbies: Cycling and hiking with friends (emphasises overall healthy lifestyle)

• Substance use:

  • Non-smoker

  • No recreational drugs

  • Alcohol: Occasional social drinking prior to pregnancy; none since conception (partly due to morning-sickness aversion)

Family & Social Support

• Immediate families live in South Australia (interstate)

• Local network: “Loads of friends” of similar age → strong social circle

• Post-partum plans:

  • Paul: Limited leave; will return to work soon after birth

  • Sarah’s mother: Approved leave to visit and help

  • Paul’s parents: Hope to travel and provide additional support

  • Sister in Perth (mother of two): Regular contact, provides advice; prompted questions about genetic testing

Presenting Concerns

1. Morning Sickness (Nausea & Vomiting in Pregnancy – NVP)

   • Described as severe: “Not just in the morning”; caused 2 days absence from work last week

   • Seeking guidance on safe remedies or “anything I can do or take” to ease symptoms

2. Interest in Genetic Testing (NIPT)

   • Heard from sister about Non-Invasive Prenatal Testing (NIPT)

   • Key questions Sarah wants answered:

     • Does NIPT provide definitive answers on abnormalities?

     • Should she consider it?

     • Risks associated with the test?

Explanation & Clinical Significance (Context for Counseling)

Morning Sickness

• Typical onset: $6$–$12$ weeks’ gestation; peaks around $9$ weeks; usually resolves by $16$–$20$ weeks

• Pathophysiology theories: Elevated hCG and estrogen, slowed gastric emptying, genetic factors

• Red-flag escalation: Weight loss >5\% pre-pregnancy weight, dehydration, ketonuria → consider hyperemesis gravidarum

• Evidence-based relief strategies:

  • Lifestyle: Small frequent meals, high-protein snacks, avoid triggers, ginger ($\leq 1$ g/day)

  • Pharmacologic (pregnancy-safe): Pyridoxine ± doxylamine, antihistamines, ondansetron (after first-line fails)

  • Complementary: Acupressure (P6 point), vitamin B6

Non-Invasive Prenatal Testing (NIPT)

• Definition: Maternal blood test that analyses cell-free fetal DNA (cffDNA) from the placenta, usually ≥ $10$ weeks’ gestation

• Detects common trisomies (Down syndrome $T21$, Edwards $T18$, Patau $T13$) and sex-chromosome aneuploidies

• Accuracy:

  • Sensitivity & specificity for $T21$ often > $99\%$

  • Not diagnostic → high-level screening; positive result requires confirmatory invasive test (e.g.
    CVS or amniocentesis)

• Advantages: Non-invasive, no miscarriage risk, early results, optional fetal-sex information

• Risks: Minimal (standard venipuncture); main issue is possible anxiety or false-positive/negative outcomes

• Considerations before opting in:

  • Personal values regarding detection of genetic conditions

  • How results may influence pregnancy management or decision-making

  • Financial cost (often not publicly funded)

  • Counseling on limitations: does not screen for all congenital anomalies

Practical Next Steps for the Clinician

• Provide handouts & discuss first-trimester options: Combined screening vs NIPT vs diagnostic tests

• Offer evidence-based morning sickness management plan tailored to severity

• Arrange dating/viability scan if not yet done; book 12-week scan & routine antenatal labs

• Discuss ongoing support: antenatal classes, mother’s groups, online resources

• Document social strengths (strong friend network) and potential stressors (families interstate, Paul’s limited leave)

Based on the provided information for Sarah:

1. Does NIPT provide definitive answers on abnormalities?
   No, NIPT (Non-Invasive Prenatal Testing) is a high-level screening test, not a diagnostic one. While it is highly accurate for common trisomies like Down syndrome ($T21$), Edwards ($T18$), and Patau ($T13$) with a sensitivity often greater than $99\%$, a positive result does not provide a definitive answer. It requires a confirmatory invasive test, such as CVS (Chorionic Villus Sampling) or amniocentesis, to get a diagnostic answer.

2. Should she consider it?
   The decision to undergo NIPT is a personal one. Considerations before opting in include your personal values concerning the detection of genetic conditions, how potential results might influence your pregnancy management or decision-making, and the financial cost, as it is often not publicly funded. It's also important to understand its limitations, as it does not screen for all congenital anomalies.

3. Risks associated with the test?
   The physical risks associated with NIPT are minimal, similar to a standard blood draw (venipuncture). The main issues are the potential for anxiety arising from the results or the possibility of false-positive or false-negative outcomes, which can lead to unnecessary worry or a false sense of security.