Tests and scans

Know what each pregnancy test can—and cannot—tell you.

Pregnancy investigations are timed for different questions: confirming health baselines, estimating gestational age, screening for conditions and assessing fetal development. Not every test is required for every pregnancy, and a screening result is not the same as a diagnosis.

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Illustration of expectant parents attending an abdominal ultrasound appointment

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What to know

Understand your care and know what to do next.

Early blood and urine tests

Common early investigations may include a blood count, blood group and Rh type, urine testing and screening for selected infections. Results can identify anaemia, urinary infection or other issues that are often manageable when recognised early.

The exact panel depends on history and local clinical protocols. Later testing may reassess haemoglobin, glucose or other measures, particularly when symptoms or risk factors make closer monitoring useful.

Understand why the test is advised
Ask when the result will be reviewed
Keep copies in the pregnancy record

Ultrasound has timed roles

An early scan may help establish location, viability and dating. A later detailed scan examines fetal anatomy, while growth, fluid or Doppler assessments may be added when the clinical picture requires them.

A reassuring ultrasound cannot exclude every condition, and an uncertain finding does not automatically mean something is wrong. Some results require repeat imaging, a different gestational age or specialist interpretation.

Dating and viability assessment
Anatomy evaluation at the advised window
Growth surveillance when indicated

Screening is a choice

Screening estimates the chance of certain conditions; diagnostic tests answer narrower questions more definitively and may have different implications or risks. Counselling should come before consent, especially when options depend on gestational age.

Couples deserve understandable information about accuracy, limitations, possible next steps and whether a result would change pregnancy care. Avoid comparing individual reports with unsupervised online charts.

Screening is not diagnosis
Timing affects available options
Results should be interpreted together

This guide provides general education, not a diagnosis or an individual pregnancy plan. Follow the advice given for your pregnancy and seek urgent assessment when warning symptoms occur.

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Sources for this guideACOG: routine tests during pregnancy WHO antenatal care recommendations