What Blood Tests Should You Consider After 40?
Turning 40 doesn't automatically mean you need a long list of blood tests every year. But it is a good time to become more intentional about your health.
As we move through midlife, our risk for certain conditions changes. Blood pressure, cholesterol, blood sugar, hormones, thyroid function, and other health markers may become more relevant depending on your age, symptoms, family history, lifestyle, and overall health.
The goal isn't to order every test available. But to identify the tests that can actually tell you something useful about your health.
Do You Need Bloodwork Every Year After 40?
Not necessarily. No single universal blood panel fits everyone over 40.
Some tests are appropriate for routine screening. Others make sense only when you have certain symptoms, risk factors, medications, or a family history that increases your risk.
That's why I prefer to think about lab testing in terms of questions: What are we looking for?
If you're feeling tired, that's a different conversation than if you're monitoring diabetes risk.
If you're experiencing changes in your menstrual cycle, that's different from evaluating low testosterone in a man.
The right tests should match the person sitting in front of me—not simply their age.
Blood Tests to Consider in Midlife
Here are some of the tests that may be useful to discuss with your healthcare provider after 40.
1. Cholesterol and Lipid Testing
A lipid panel typically looks at markers including:
Total cholesterol
LDL cholesterol
HDL cholesterol
Triglycerides
These numbers help assess cardiovascular risk and can be particularly important as you get older. Your cholesterol results don't exist in isolation, though. Your overall cardiovascular risk also depends on factors such as blood pressure, smoking history, diabetes, age, and other health conditions. It's about understanding your overall cardiovascular risk and what you can do about it.
2. Blood Sugar and A1C
Monitoring your blood sugar becomes increasingly important as you move through midlife.
Depending on your individual risk factors, your provider may recommend testing for prediabetes or type 2 diabetes. An A1C estimates your average blood sugar over the previous few months and can help identify elevated blood sugar that may not cause obvious symptoms.
3. Complete Blood Count (CBC)
A CBC measures several components of your blood, including red blood cells, white blood cells, and platelets. It can be useful when there are symptoms or clinical concerns such as:
Persistent fatigue
Weakness
Unexplained changes in health
Possible anemia
Certain infections or inflammatory conditions
A CBC isn't necessarily something every healthy adult needs on a fixed schedule. Its usefulness depends on your symptoms and medical history.
4. Comprehensive Metabolic Panel (CMP)
A comprehensive metabolic panel can provide information about several aspects of your health, including:
Kidney function
Liver function
Electrolytes
Blood glucose
Protein levels
This can be particularly useful when monitoring certain health conditions or medications, or when symptoms suggest that something may be affecting your metabolic health.
5. Thyroid Testing
Your thyroid influences metabolism, energy, temperature regulation, heart rate, and many other processes.
Thyroid problems can sometimes cause symptoms that are easy to attribute to stress or aging, including:
Fatigue
Weight changes
Changes in mood
Temperature sensitivity
Changes in heart rate
Difficulty concentrating
Remember, symptoms alone don't tell us whether your thyroid is the problem. That's where appropriate testing and clinical evaluation come in.
6. Vitamin D
Vitamin D plays an important role in bone health and muscle function.
Testing isn't necessary for everyone, but it may be useful depending on your risk factors, medical history, symptoms, and whether you're taking vitamin D supplements.
7. Iron and Ferritin
Iron deficiency can contribute to fatigue and other symptoms.
Testing may be particularly relevant for people with:
Heavy menstrual bleeding
A history of anemia
Persistent unexplained fatigue
Certain gastrointestinal conditions
Other risk factors for iron deficiency
Ferritin reflects your body's stored iron and may be included when evaluating possible iron deficiency.
8. Hormone Testing for Women
Hormone testing becomes a little more complicated during midlife.
If you're experiencing symptoms of perimenopause or menopause, you may wonder whether you need a panel of estrogen, progesterone, FSH, and other hormones.
Perimenopause is often diagnosed based on your age, symptoms, and menstrual history rather than relying on a single hormone measurement. Hormone levels can fluctuate considerably during the menopausal transition.
That means a single "normal" or "abnormal" hormone result may not tell the whole story.
Instead, the most useful evaluation often starts with understanding what's actually changing:
Your menstrual cycle
Sleep
Mood
Energy
Hot flashes or night sweats
Brain fog
Libido
Other symptoms
Testing may be useful in specific situations, but it shouldn't replace a conversation with your doctor about your symptoms and health history.
9. Testosterone Testing for Men
This is another area where you should consider symptoms and lab testing together.
Fatigue, reduced motivation, changes in body composition, lower libido, erectile dysfunction, and reduced muscle mass can have many causes.
They don't automatically mean you have low testosterone.
If testosterone deficiency is suspected, diagnosis requires compatible symptoms or signs plus consistently low testosterone levels confirmed with repeat testing.
A low testosterone result by itself isn't the whole diagnosis.
10. Other Tests Based on Your Individual Risk
Depending on your health history, family history, symptoms, medications, and lifestyle, your provider may recommend additional testing.
That might include evaluation related to:
Kidney health
Liver health
Nutrient deficiencies
Cardiovascular risk
Metabolic health
Inflammation
Specific medical conditions
The important question isn't: "What is the biggest lab panel I can get?"
It's: "What information would actually help us make a better decision about my health?"
What If You Feel Fine?
That's an important question. Preventive healthcare isn't only for people who have symptoms.
The most useful testing strategy considers your symptoms, risk factors, family history, medications, lifestyle, and goals. Sometimes that means a relatively simple set of routine tests. Other times, your symptoms call for a more detailed evaluation.
That's why routine preventive care still matters even when you feel healthy. At the same time, being proactive doesn't mean ordering dozens of tests without a reason. Good preventive medicine is targeted.
Dr. Dawson's Take
One thing I want patients to understand about bloodwork is that more isn't always better.
A long list of lab results can look impressive, but if we don't know why we're ordering a test or what we'll do with the result, it may not actually help you.
I want to know what has changed. How are you sleeping? How is your energy? How are you recovering? How is your mood? Have you noticed changes in your weight, strength, libido, or menstrual cycle?
Then we can determine which questions need answers and which tests can help us get there.
Your 40s and beyond are a great time to become more proactive about your health, because understanding it gives you more information to work with.
The right testing isn't about doing everything. It's about doing what's useful for you.