Laboratory Testing for a 37-Year-Old Woman Planning Pregnancy
For a 37-year-old woman who is ovulating and planning pregnancy within the next year, perform preconception laboratory testing including: complete blood count, blood type and Rh screen, thyroid-stimulating hormone, rubella immunity, infectious disease screening (HIV, hepatitis B and C, syphilis, chlamydia/gonorrhea), diabetes screening (fasting glucose or hemoglobin A1c), and urinalysis. 1
Core Preconception Laboratory Panel
The essential baseline tests include:
- Complete blood count (CBC) to identify anemia or hematologic abnormalities that could impact fertility and pregnancy outcomes 1
- Blood type and Rh screen to identify potential Rh incompatibility issues requiring RhoGAM administration 1, 2
- Urinalysis as part of baseline assessment 1, 2
Endocrine Assessment
Given your age and fertility goals, endocrine testing is critical:
- Thyroid-stimulating hormone (TSH) to rule out thyroid disorders that significantly affect fertility and pregnancy outcomes; ideally TSH should be <2.5 mIU/L before conception 1, 3
- Diabetes screening with fasting glucose or hemoglobin A1c, as uncontrolled diabetes increases risks of congenital anomalies and pregnancy complications 1, 2
Infectious Disease Screening
Universal screening should include:
- Rubella immunity testing - women found seronegative should be vaccinated before conception, as rubella infection during pregnancy causes severe congenital defects 1, 2
- HIV testing should be offered to all women planning pregnancy 1, 2
- Hepatitis B surface antigen (HBsAg) and Hepatitis C screening 1, 2
- Syphilis screening performed universally 1, 2
- Chlamydia and gonorrhea screening, particularly given their impact on fertility and pregnancy outcomes 1, 2
Age-Specific Considerations
At age 37, you fall into the category requiring expedited fertility evaluation after only 6 months of attempting conception rather than the standard 12 months for women under 35. 4, 5 This is because female fecundity declines with age and should guide decision-making. 5
If you are already ovulating regularly, the focus shifts from ovulation assessment to ensuring optimal preconception health and ruling out other fertility barriers. However, if fertility concerns arise:
- Ovarian reserve testing may be warranted given your age, though this is typically done if conception difficulties occur 6, 4
- Imaging studies such as transvaginal ultrasound can evaluate uterine anatomy and ovarian morphology if indicated 6
Important Clinical Caveats
- Lipid panels and liver enzymes are not necessary for healthy women planning pregnancy unless specific risk factors are present 1
- Testing should ideally occur 3-6 months before attempting conception to allow time for interventions such as rubella vaccination 1
- Cervical cytology (Pap smear) should be up-to-date according to routine screening guidelines, though not required specifically for preconception care 1
- Women with positive infectious disease screening require appropriate treatment and counseling before conception 1
Supplementation Recommendation
Concurrent with laboratory testing, begin folic acid supplementation (400-1000 mcg daily) to reduce risk of neural tube defects 3, 2