BlueNet SPECIALITIES
Gynecology and Obstetrics

First trimester tests

essential pregnancy exams explained

First trimester tests

During the first trimester of pregnancy, it is essential to undergo a series of tests to evaluate your health and your baby’s development.
Although it may seem overwhelming, understanding each test helps you feel more confident and informed.

In this article, we explain the most important first trimester tests in a simple way.

Why are first trimester tests important?
These tests confirm proper pregnancy development, detect early risks, and help establish appropriate prenatal care.

They also allow early treatment when needed.

Key first trimester tests (explained simply)

1. Blood tests (general and metabolic evaluation)
These tests assess your overall health and detect common conditions. Include:

  • Complete blood count (CBC)
  • Basic metabolic panel
  • Fasting glucose
  • Thyroid function (TSH)

2. Blood type, Rh factor, and indirect Coombs test
These tests evaluate blood compatibility between mother and baby and help prevent complications.

3. Infection screening (very important)
Helps detect infections that may affect the pregnancy. Include:

  • HIV
  • Syphilis (VDRL/RPR)
  • Hepatitis B (± Hepatitis C)
  • TORCH profile (toxoplasmosis, rubella, CMV, herpes)

4. Pregnancy hormone (β-hCG)
Used when confirmation or follow-up of early pregnancy is needed.

5. Urine tests and cultures
Help detect infections that may go unnoticed. Include:

  • Urinalysis
  • Urine culture
  • Cervicovaginal culture

6. Prenatal screening tests (early genetic evaluation)
Help estimate the risk of chromosomal abnormalities. Include:

  • Combined test (PAPP-A + β-hCG)
  • Nuchal translucency measurement
  • Non-invasive prenatal test (NIPT, optional)

7. First trimester ultrasounds
Essential for pregnancy evaluation. Include:

  • Early ultrasound (6–8 weeks): confirms location and viability

  • First trimester ultrasound (11–14 weeks): structural evaluation + nuchal translucency

8. Other gynecological tests
Depending on your history:

  • Pap smear (if not up to date)

What happens after these tests?
Your doctor will create a personalized prenatal plan based on your results.

Importance of timely testing
These tests allow early risk detection, better decision-making, and proper monitoring.

Key summary

During the first trimester, the following are assessed:

  • Infectious and serological studies
  • Hematologic and metabolic evaluation
  • Blood compatibility
  • Early chromosomal screening
  • Pregnancy confirmation and dating via ultrasound
Support during the first trimester

Having proper medical guidance helps you understand each step and feel more confident.

At BlueNet Hospitals, we support you from the beginning of your pregnancy with lab tests, ultrasound, and specialized care.

📲 Book your appointment via WhatsApp

+52 1 624 151 0693

Schedule your appointment and complete your first trimester tests with us.

Frequently Asked Questions

1. Are all these tests mandatory?
Not all, but many are strongly recommended.

2. Are these tests safe?
Yes, they are safe for both mother and baby.

3. Is NIPT necessary?
It depends on individual risk and medical recommendation.

4. Why is infection screening important?
Because untreated infections may affect the baby.

5. When should I take these tests?
During the first weeks of pregnancy as advised by your doctor.