When something gets missed in blood work, it’s usually not because your doctor isn’t paying attention.
It’s because standard blood work is designed to diagnose disease, not necessarily to evaluate how well your body is functioning before disease develops.
Another reason things get missed?
The right blood tests often aren’t included in routine panels — frequently because insurance won’t cover them unless there’s already a clear medical reason.
It can be frustrating.
But when you understand how blood work is structured and what tests are available, you can start asking better questions and getting more insight into your health.
In this post, we’re going to look at several blood work markers that are often missing from standard annual lab panels, but can offer valuable insight into metabolism, nutrient status, inflammation, and thyroid function.
Blood Work That Should Be Included in Annual Lab Testing
These are several markers I often review when looking at blood work from a functional perspective.
They can provide helpful context about what may be happening beneath the surface.
1. Fasting Insulin
If one marker could change the way we approach metabolic health, it might be fasting insulin.
Most annual blood work checks glucose.
But glucose is often the last marker to change when blood sugar regulation begins to shift.
Insulin can rise years earlier.
Insulin is a hormone produced by the pancreas that helps move glucose from the bloodstream into cells, where it can be used for energy.
When the body needs to produce increasing amounts of insulin to manage blood sugar, it may indicate the beginning of insulin resistance.
The earlier these patterns are observed, the easier they often are to address through lifestyle and nutrition strategies.
Monitoring insulin alongside glucose can provide a clearer picture of metabolic health.
2. Homocysteine
Homocysteine is an amino acid produced during normal metabolism.
When homocysteine levels rise, it can sometimes indicate that the body may need additional support with nutrients involved in the methylation cycle, such as B vitamins.
Homocysteine levels are often used to evaluate patterns related to:
• cardiovascular health
• inflammation
• nutrient status
• detoxification pathways
Elevated homocysteine has been associated with increased cardiovascular risk and systemic inflammation in research settings.
Looking at this marker can offer insight into how efficiently the body is managing certain metabolic processes.
3. GGT (Gamma-Glutamyl Transferase)
GGT is a liver enzyme that is often overlooked in routine blood work.
Like ALT and AST, it can provide insight into liver function.
But GGT is particularly interesting because it is closely connected to glutathione metabolism.
Glutathione is one of the body’s most important antioxidants and plays a key role in detoxification.
Subclinical elevations in GGT have been associated in research with metabolic stress and increased risk for certain chronic conditions.
From a functional perspective, this marker can offer insight into how the liver may be responding to oxidative stress or toxic burden.
4. Thyroid Panel
When people ask their doctor to check thyroid function, most of the time only TSH (thyroid stimulating hormone) is tested.
TSH is produced by the pituitary gland in the brain and signals the thyroid to produce hormones.
While this marker is helpful, it doesn’t provide the full picture.
A more comprehensive thyroid panel may include:
• Free T4
• Free T3
• Reverse T3
• TPO antibodies
• Tg antibodies
Looking at these additional markers can provide more context about thyroid hormone production, conversion, and potential immune involvement.
This matters because thyroid hormones influence nearly every system in the body, including metabolism, energy production, digestion, and hormone balance.
5. Micronutrient Levels
Another area often missing from routine blood work is nutrient status.
Depending on the situation, testing certain nutrients can provide helpful information about immune health, metabolism, and cellular function.
Common micronutrient markers include:
• Vitamin B12
• Vitamin D
• Zinc
• Magnesium
• Folate
• Selenium
• Iron and ferritin
• Copper and ceruloplasmin
In some cases, testing nutrients in red blood cell (RBC) form can provide additional insight into what may actually be making it into the cell.
After all, as the saying goes:
You are what you eat, digest, absorb, and transport into the cell.
You can be eating all the right foods — but if digestion or absorption isn’t working well, those nutrients may not be getting where they need to go.
Why These Markers Aren’t Always Included in Standard Blood Work
These tests are widely available and supported by research.
But the structure of healthcare systems means most testing is ordered after symptoms become severe enough to warrant investigation.
Routine blood work is primarily used to:
• diagnose disease
• monitor existing conditions
• evaluate medication effects
Preventive blood work that looks at early metabolic patterns often falls outside this framework.
That doesn’t make these markers less valuable.
It simply means they are often accessed through preventive or functional health programs rather than routine screening.
The Real Value of Looking Deeper at Blood Work
What most people discover when reviewing blood work through a broader lens is this:
The numbers themselves are only part of the picture.
The real value comes from understanding what the patterns may be suggesting.
When we review blood work from a functional perspective, patterns often begin to emerge.
Symptoms that once felt unrelated — fatigue, brain fog, stubborn weight changes, sleep disruptions — sometimes start to connect.
That understanding can help guide more informed conversations about lifestyle, nutrition, and overall health strategy.
Functional Health Panel
If you’re curious what a deeper look at your blood work might reveal, I created the Functional Health Panel for exactly this purpose.
This panel includes both the foundational blood work your doctor typically orders and additional markers that can provide insight into metabolism, inflammation, thyroid function, and nutrient status.
It also includes a private educational review session, where we walk through your lab results together so you can better understand the patterns your blood work may be revealing.
Because blood work by itself isn’t the answer.
Understanding it is.
Learn more about the Functional Health Panel here.
Sometimes the difference between feeling “fine” and feeling truly well comes down to having the right data — and knowing what to do with it.
Frequently Asked Questions About Blood Work
What is functional blood work?
Functional blood work refers to additional lab markers that may help provide insight into metabolic function, inflammation, nutrient status, and hormone activity.
These markers are often used in wellness or preventive health settings to observe patterns that may influence how the body is functioning.
Are these blood work markers diagnostic?
No. The markers discussed in this article are not intended to diagnose medical conditions on their own. They are used for educational purposes and to provide additional context when reviewing health data.
Any medical concerns or treatment decisions should always be discussed with a licensed healthcare provider.
Why don’t doctors always order these tests?
Most physicians order tests based on medical guidelines designed to diagnose or monitor disease. Some preventive or functional markers may fall outside routine screening guidelines or may not be covered by insurance unless specific criteria are met.
How often should blood work be checked?
Many healthcare providers recommend annual blood work as part of routine health monitoring. The specific tests that should be included can vary depending on individual health history and should always be discussed with a qualified healthcare professional.
Important Note
I am a certified functional health practitioner and health coach, not a licensed physician or medical doctor. My work with laboratory data is educational in nature and is intended to help you better understand general patterns that may be present in your health information.
The information shared in this article is for educational and informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Discussion of laboratory markers in this content is meant to provide general wellness education and should not be interpreted as medical advice.
Laboratory testing and any health concerns should always be reviewed with your licensed healthcare provider, who can evaluate your individual situation and provide appropriate medical guidance.
Sources
Shanik MH et al. Insulin Resistance and Hyperinsulinemia
Refsum H et al. Homocysteine and Cardiovascular Disease
Lee DH et al. Gamma-Glutamyltransferase and Metabolic Disease
Note: The way I work with labs is from an educational perspective. My role is to help you understand your results, recognize patterns within your data, and explore how nutrition, lifestyle, and foundational wellness practices may support your overall health and vitality.
The content shared here is for educational and informational purposes only and is not intended as medical advice. It should not be used to diagnose or treat any medical condition. Always consult your physician or qualified healthcare provider regarding any health concerns or treatment decisions.
