What routine primary care laboratory tests should be ordered for a generally healthy 52‑year‑old woman?

Routine Primary Care Labs for a 52-Year-Old Woman

For a generally healthy 52-year-old woman, order a lipid panel, fasting glucose or HbA1c, and TSH; consider adding colorectal cancer screening (FIT or colonoscopy) and ensure cervical cancer screening is up to date per guidelines.

Core Laboratory Tests

Diabetes Screening

• Screen with fasting glucose or HbA1c starting at age 45, or earlier if BMI ≥25 kg/m² with additional risk factors (physical inactivity, hypertension, family history, history of gestational diabetes, PCOS) 1
• If normal, repeat every 3 years 1
• At age 52, this woman should have already been screened and needs reassessment if the last test was >3 years ago

Lipid Screening

• Lipid panel (total cholesterol, LDL, HDL, triglycerides) is essential for cardiovascular risk assessment 2, 3
• Dyslipidemia is one of the three most common reasons for laboratory testing in primary care 3
• Screening frequency depends on baseline risk and prior results

Thyroid Function

• TSH screening is recommended for women at midlife 2
• The trend data shows increasing adoption of TSH screening in women aged 55, rising from 14% in 1978 to 57% in 2004 4
• Women are at higher risk for thyroid disease than men, making this particularly relevant

Additional Considerations Based on Risk Factors

Blood Pressure

• If hypertension is present (>135/80 mmHg sustained), diabetes screening becomes more important for cardiovascular risk reduction 1

Complete Blood Count and Urinalysis

• Not routinely recommended for asymptomatic healthy adults
• The evidence shows a clear declining trend: CBC ordering dropped from 89% in 1978 to 67% in 2004 for healthy 55-year-old women, and urinalysis from 96% to 55% 4
• Only order if specific symptoms or risk factors warrant investigation

Chemistry Panel

• Not routinely indicated unless specific risk factors exist (kidney disease risk, medication monitoring)
• Ordering increased slightly to 76% by 2004 but lacks strong guideline support for routine screening 4

Cancer Screening (Non-Laboratory)

While not strictly "labs," these are critical at age 52:

• Colorectal cancer screening should be current (colonoscopy, FIT, or other approved methods)
• Mammography per current breast cancer screening guidelines
• Cervical cancer screening if not already completed per age-based protocols

Common Pitfalls to Avoid

1. Over-testing: Avoid ordering CBC, comprehensive metabolic panels, and urinalysis routinely in asymptomatic patients—this practice has appropriately declined over decades 4

2. Missing diabetes screening: With the high prevalence of type 2 diabetes and prediabetes, this is a critical test that directly impacts morbidity and mortality 1

3. Ignoring thyroid screening in women: Women have higher rates of thyroid dysfunction, and screening at midlife is cost-effective 2

4. Ordering tests without clinical indication: 80% of requests in 2009 lacked clinical indication, though this improved to 20% by 2015 with better systems 3

Risk-Stratified Approach

If additional risk factors present:

• Hypertension or hyperlipidemia: Prioritize diabetes screening 1
• Family history of diabetes: Screen regardless of BMI 1
• Obesity (BMI ≥25): Add diabetes screening if not already done 1
• History of gestational diabetes or PCOS: Ensure regular diabetes surveillance 1

The evidence strongly supports selective, guideline-based testing rather than broad laboratory panels 4, 5. Focus on tests that detect conditions where early intervention improves outcomes: diabetes, cardiovascular disease, and thyroid dysfunction in this age group.