Blood Tests by Age: Your Decade-by-Decade Guide
The blood tests you need change as you age. This guide walks you through what to request in each decade of life, why each test matters, and how often you should be tested.
Your Blood Test Timeline
Each decade brings new screening priorities. Tap any decade below to expand the full list of recommended tests. Earlier decades focus on establishing baselines; later decades shift to active monitoring and trend tracking.
Your 20s
This is your benchmark decade.
Your 20s are about establishing baseline values that every future test will be compared against. Most young adults feel invincible, but iron deficiency, vitamin D deficiency, and undiagnosed thyroid conditions are surprisingly common in this age group. These baselines also help detect rare conditions early, when they are most treatable.
Recommended Tests
Complete Blood Count (CBC) — baseline haemoglobin, white cells, platelets
Basic Metabolic Panel — kidney function, electrolytes, glucose
STI Screening — chlamydia, gonorrhoea, HIV, syphilis (if sexually active)
Vitamin D — deficiency is extremely common in young adults, especially in southern states
Iron Studies — particularly important for menstruating women
Your 30s
Metabolic watch begins.
Your 30s are when the first signs of cardiovascular and metabolic risk start appearing silently in blood work, often years before symptoms develop. Cholesterol, thyroid function, and blood sugar screening become important. This is also the decade when fertility planning drives additional hormone testing.
Recommended Tests
Lipid Panel (Cholesterol) — LDL, HDL, triglycerides baseline
Thyroid Function (TSH) — especially women (autoimmune thyroid peaks in 30s)
Fasting Glucose — diabetes risk begins increasing from mid-30s
Iron Studies — ongoing for women; men should check for overload
Vitamin D and B12 — common deficiencies that affect energy and mood
Liver Function Tests — baseline for future comparison
Your 40s
This is when silent conditions emerge.
The 40s represent a turning point where preventive screening becomes essential rather than optional. Heart disease risk doubles compared to the 30s, type 2 diabetes diagnoses peak, fatty liver disease becomes increasingly common, and perimenopause often begins. Many of these conditions are completely silent without blood tests.
Recommended Tests
HbA1c — formal diabetes screening recommended for all adults
Lipid Panel — now annual (cardiovascular risk increases significantly)
Liver Function Tests — annual (fatty liver disease peaks)
Kidney Function (eGFR, Creatinine) — annual baseline
PSA Discussion (Men) — discuss prostate screening with your doctor
Perimenopause Hormones (Women) — FSH, estradiol if symptomatic
Cardiac Markers — CRP, homocysteine for cardiovascular risk
Your 50s
Every number matters now.
Your 50s require comprehensive and active monitoring. Bone density markers become critical post-menopause, vitamin B12 absorption declines, inflammatory markers help screen for chronic disease, and cardiovascular events become significantly more likely. This is the decade when consistent tracking of trends matters most.
Recommended Tests
Vitamin B12 and Folate — absorption decreases with age
Calcium and Vitamin D — bone health becomes critical
Inflammatory Markers (CRP, ESR) — chronic inflammation screening
Comprehensive Metabolic Panel — liver, kidney, electrolytes, glucose
Hormone Panel — testosterone (men), post-menopause markers (women)
PSA (Men) — annual prostate screening as discussed with doctor
Coagulation Studies — stroke and DVT risk increases
Your 60s+
Knowledge is your best medicine.
In your 60s and beyond, comprehensive tracking becomes your most powerful health tool. Anaemia has multiple possible causes and always warrants investigation. B12 deficiency can mimic early dementia. Kidney function naturally declines and must be tracked over time. Nutritional deficiencies become common due to reduced appetite and absorption. Polypharmacy increases risk of drug interactions affecting blood values.
Recommended Tests
CBC with Differential — anaemia screening (multi-factorial at this age)
Comprehensive Metabolic Panel — more frequent kidney and liver monitoring
Vitamin B12 — deficiency mimics dementia symptoms, always rule out
Vitamin D and Calcium — bone health and fall prevention
Kidney Function (eGFR, Creatinine, BUN) — track decline trajectory
Inflammatory Markers (CRP, ESR) — infection and chronic disease monitoring
Iron Studies and Ferritin — anaemia is common and multi-factorial
Nutritional Panel (Albumin, Magnesium, Folate) — nutritional status
Bone Markers (ALP, PTH) — osteoporosis monitoring
Gender-Specific Considerations
In addition to the age-based recommendations above, men and women have distinct physiological needs that require specific blood tests.
Additional for Women
Iron Studies (Ferritin)
Monthly menstrual losses make iron deficiency the most common nutritional deficiency in women of reproductive age.
Thyroid Panel (TSH, Free T4)
Thyroid disorders are 8x more common in women. Hashimoto's often presents in the 30s–40s.
Hormones (FSH, LH, AMH, Estradiol)
Fertility planning, PCOS diagnosis, and perimenopause monitoring.
Vitamin D
Post-menopausal women lose bone density rapidly — vitamin D is essential for calcium absorption.
Calcium and Bone Markers
Osteoporosis risk increases dramatically after menopause due to estrogen decline.
Additional for Men
PSA (Prostate-Specific Antigen)
Discuss with doctor from age 40 (or earlier with family history). Screening is nuanced.
Testosterone (Total and Free)
Declines ~1–2% per year after 30. Test if fatigue, low libido, or mood changes.
Iron Studies (Ferritin)
Men can accumulate excess iron over time. Elevated ferritin may indicate haemochromatosis (1 in 200).
Liver Function Tests (LFTs)
Men are more likely to develop alcohol-related and non-alcoholic fatty liver disease.
Uric Acid
Gout affects men 3–4x more than women and is an independent cardiovascular risk factor.
Quick Reference Matrix
A comprehensive overview of when each test becomes recommended. Filled cells indicate that the test should be part of your routine screening for that decade.
| Test | 20s | 30s | 40s | 50s | 60s+ |
|---|---|---|---|---|---|
| CBC | |||||
| Basic Metabolic Panel | |||||
| Iron Studies | |||||
| Vitamin D | |||||
| Lipid Panel | — | ||||
| Fasting Glucose | — | ||||
| Liver Function Tests | — | ||||
| Thyroid (TSH) | — | ||||
| HbA1c | — | — | |||
| Kidney Function (eGFR) | — | — | |||
| Vitamin B12 | — | — | — | ||
| Inflammatory (CRP, ESR) | — | — | — | ||
| Calcium / Bone Markers | — | — | — | ||
| Coagulation Studies | — | — | — | ||
| Nutritional Panel | — | — | — | — |
Note: Tests may be recommended earlier if risk factors are present (see below). This matrix represents general population screening, not personalised medical advice.
Risk Factor Accelerators
Certain conditions and family histories mean you should start screening earlier than the standard recommendations. If any of these apply to you, discuss earlier testing with your doctor.
Family History of Diabetes
Start HbA1c screening at 30, not 40. If a parent or sibling has type 2 diabetes, your lifetime risk is 40–70%. Annual fasting glucose from age 25.
Heart Disease in Family
Begin lipid panels at 20, not 30. First-degree relative with early heart disease (before 55 for men, 65 for women) means you should also get Lp(a) and hs-CRP.
PCOS Diagnosis
Add glucose, insulin, HbA1c, lipids, and testosterone from diagnosis regardless of age. PCOS carries 2–4x diabetes risk and elevated cardiovascular risk.
Autoimmune Condition
Add CRP, ESR, and organ-specific markers from diagnosis. Autoimmune conditions cluster — thyroid, coeliac, and type 1 diabetes frequently coexist.
How Often Should I Test?
Testing frequency depends on your baseline health and what you are monitoring for. More frequent testing catches changes earlier when they are easier to address.
Healthy, no known conditions
Every 2 – 3 years
Known chronic condition
Every 3 – 6 months
On medication (monitoring)
As prescribed by doctor
After major lifestyle change
3 months to assess impact
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