Health Checkup: Which Tests to Get for Preventive Screening by Age
Most serious conditions — cardiovascular disease, diabetes, cancer — develop over years without symptoms. By the time something starts to bother you, the disease may already be advanced. Preventive health screenings (checkups) catch problems at an early stage, when treatment is simpler, less expensive, and more effective.
This article provides specific lists of tests and screenings for different age groups, based on established clinical guidelines.
Why Checkups Matter and How Often to Get One
A checkup is not treatment and not symptom-based diagnosis. It is screening: looking for abnormalities in people who feel healthy. The goal is to find a problem before it becomes apparent.
How often to get a checkup:
- Under 30 with no chronic conditions — every 2–3 years
- Ages 30–50 — annually
- Over 50 — annually; some tests every 2 years
- With chronic conditions or risk factors — as directed by your doctor, more frequently
Core Tests for Everyone (With Normal Ranges)
Regardless of age, a basic checkup includes:
Complete blood count (CBC): evaluates red cells, white cells, and platelets. Detects anemia, inflammation, and infection.
Basic metabolic panel / blood chemistry:
- Fasting glucose — normal below 100 mg/dL (100–125 mg/dL = prediabetes; 126+ = diabetes)
- Total cholesterol — normal below 200 mg/dL; LDL ("bad") below 100 mg/dL
- Triglycerides — normal below 150 mg/dL
- ALT and AST — liver enzymes; elevation signals liver stress
- Creatinine and BUN — kidney function markers
- Uric acid — when gout is suspected
Urinalysis: detects protein, blood, and signs of urinary tract infection.
Blood pressure measurement: normal below 120/80 mmHg. Hypertension is diagnosed at sustained readings of 130/80 or above (per current guidelines).
ECG: from age 40 — annually; detects rhythm disturbances and signs of ischemia.
Chest X-ray: annually — screens for tuberculosis and lung abnormalities.
Checkup at Ages 30–40: What to Add
In your 30s and 40s, add the following to the core panel:
Thyroid-stimulating hormone (TSH): screens for hypo- and hyperthyroidism. Normal: 0.4–4.0 mIU/L. Especially important for women — thyroid disorders are 5–10 times more common in women.
Glycated hemoglobin (HbA1c): reflects average blood sugar over the past 3 months. Normal: below 5.7%. More accurate for detecting prediabetes than a single fasting glucose test.
Ferritin: iron stores in the body. Iron deficiency can exist with a normal hemoglobin level. Normal for women: 12–150 ng/mL; for men: 12–300 ng/mL.
Vitamin D (25-OH): deficiency is widespread. Normal: 30–100 ng/mL. Deficiency (below 20 ng/mL) is associated with fatigue, weakened immunity, and osteoporosis risk.
For women ages 30–40: gynecological exam + Pap smear (cervical cytology) every 3 years. This is cervical cancer screening.
For men ages 30–40: blood pressure and cholesterol checks — men are at higher risk of cardiovascular disease at younger ages.
Checkup After 50: Cancer and Heart Screening
After 50, risks increase significantly and the screening program expands.
Colonoscopy: colorectal cancer screening — starting at age 45–50, every 10 years if results are normal. This is the most effective method of preventing bowel cancer: polyps can be removed before they become malignant.
For women after 40–50:
- Mammography — breast cancer screening, every 1–2 years
- Pelvic ultrasound — annually
- Bone density scan (DEXA) — measures bone density, starting at menopause
For men after 50:
- PSA (prostate-specific antigen) — prostate cancer screening. Normal below 4 ng/mL, but interpretation depends on age and trend over time
- Prostate ultrasound if PSA is elevated or symptoms are present
For everyone after 50:
- Full lipid panel (cholesterol, LDL, HDL, triglycerides) — annually
- ECG — annually
- Blood pressure — at every medical visit
- Ophthalmologist — annually (glaucoma, cataracts, diabetic retinopathy)
- Dentist — every 6 months
Low-dose CT of the lungs: lung cancer screening for smokers with a 20+ pack-year history, ages 50–80 — annually. This is the only evidence-based lung cancer screening method.
Checkup for Men vs. Women: Key Differences
Beyond the obvious gender-specific tests (mammography, PSA), there are less obvious differences:
Women: thyroid disorders are 5–10 times more common — check TSH regularly. Iron-deficiency anemia from menstruation — ferritin matters. Osteoporosis after menopause — bone density scan. Cervical cancer — Pap smear and HPV test.
Men: cardiovascular disease develops about 10 years earlier than in women. Cholesterol and blood pressure — from age 30. Prostate cancer — PSA from age 50 (from 45 with a family history). Type 2 diabetes — glucose and HbA1c, especially with excess weight.
If you want to figure out which screenings are right for you, use Symptomatica — it helps you organize your questions before a doctor's visit.
Frequently Asked Questions
Can I order all tests myself without a doctor's referral?
Yes, most lab tests can be self-ordered at any private laboratory. But results are best interpreted with a doctor — especially if anything falls outside the normal range. Some procedures (colonoscopy, mammography, bone density scan) require a referral or specialist appointment.
Should I get tumor markers for preventive screening?
Most tumor markers (CA-125, CA 19-9, CEA, and others) are not recommended for screening in healthy people — they produce many false positives and don't improve outcomes. The exception is PSA for men over 50 — but even that requires careful interpretation. The best cancer screening tools are colonoscopy, mammography, low-dose CT for smokers, and Pap smear.
What should I do if a test result is outside the normal range?
Don't panic. A single abnormal value is not a diagnosis. See a doctor who will evaluate the result in the context of your symptoms, lifestyle, and other test values. A repeat test or additional workup may be needed. Do not self-prescribe treatment based on lab results.
Should everyone check their vitamin D level?
Vitamin D deficiency is common in northern latitudes due to limited sun exposure. It's worth checking your 25-OH vitamin D level at least once, especially if you experience fatigue, frequent infections, or bone pain. If deficiency is confirmed, a doctor will prescribe a corrective dose. A preventive dose of 800–2,000 IU/day can be taken without testing; therapeutic doses require a lab result.
At what age should I get a colonoscopy?
Per current guidelines — starting at age 45–50 with no risk factors. With a first-degree relative diagnosed with colorectal cancer — 10 years before their diagnosis age (but no later than 40). If results are normal, repeat every 10 years. Alternatives include annual or biennial fecal occult blood testing (stool test).
Symptomatica is an informational reference service. Not a medical service; does not diagnose or prescribe treatment. For any symptoms, please consult a doctor.