The Truth About Health Testing: When It Helps and When It Doesn’t

In today’s healthcare landscape, patients have more access than ever to lab testing. Direct-to-consumer panels, social media recommendations, and wellness marketing have made it easy to order extensive testing without ever stepping into a clinic.

At first glance, this may seem empowering. More information should lead to better decisions.

In reality, that is not always the case.

At Marathon Spine & Wellness in Marathon, WI, our approach is grounded in evidence-based care. We work alongside primary care providers and specialists throughout the Wausau and Central Wisconsin area to ensure that testing, when used, leads to meaningful and actionable decisions.

The goal is not to test more. The goal is to test appropriately.

The Role of Your Primary Care Provider

Primary care providers are trained to use diagnostic testing as a tool, not a starting point.

Clinical guidelines developed by organizations such as the American College of Physicians, the U.S. Preventive Services Task Force, and specialty societies exist for a reason. They are built on large-scale research and designed to balance benefit, risk, and cost.

When a PCP decides not to order a test, it is typically because:

• The result is unlikely to change management

• The likelihood of false positives outweighs potential benefit

• The test is not validated for screening in asymptomatic individuals

In most cases, this decision is correct.

It is also important to recognize the depth of training behind that decision. Primary care providers complete years of medical education, clinical training, and licensure to develop the judgment needed to apply these guidelines to individual patients.

Today, patients are also exposed to advice from individuals with brief certifications, online health credentials, or supplement-based training programs. While some of this information may be well-intentioned, it is not held to the same standards, oversight, or clinical accountability as licensed medical care.

In a system that already places time constraints on providers, it can be easy to assume a short visit means something was missed. More often, it reflects the reality of modern healthcare, not a lack of knowledge or concern.

Our Role in Marathon and the Greater Wausau Area

At Marathon Spine & Wellness, we focus on thorough, movement-based evaluation and conservative care for musculoskeletal conditions.

We do not replace your primary care provider. We support them.

Our role includes:

• Identifying when symptoms are mechanical and respond to conservative care

• Recognizing when additional testing is appropriate

• Helping patients understand when testing is unlikely to provide value

• Coordinating with PCPs and specialists when escalation of care is needed

This approach ensures that testing is used with purpose, not as a default.

When Lab Testing Is Clearly Supported

There are many tests with strong evidence for use in screening and diagnosis. These tests have well-established reference ranges and lead to clear clinical decisions.

Examples include:

1. Complete blood count (CBC) and comprehensive metabolic panel (CMP) for baseline health assessment

2. Lipid panels for cardiovascular risk evaluation

3. Hemoglobin A1c and fasting glucose for diabetes screening

4. Thyroid stimulating hormone (TSH) as the initial screening test for thyroid dysfunction

5. Age-appropriate cancer screenings, including colonoscopy and mammography

6. Bone density testing (DEXA) in at-risk populations

These tests are widely recommended because they consistently improve patient outcomes when used appropriately.

When Additional Testing Becomes More Nuanced

Some tests are highly valuable, but only when used in the correct clinical context. Without that context, they often create confusion rather than clarity.

1. Expanded Thyroid Testing

Tests such as free T4, free T3, and thyroid antibodies are useful in specific situations:

• Abnormal TSH results

• Suspicion of autoimmune thyroid disease

• Pregnancy or pituitary disorders

• Persistent symptoms that do not align with initial screening

However, major endocrine societies recommend TSH as the first-line test because it is the most sensitive indicator of thyroid function.

In patients with a normal TSH and no clear clinical indication, expanded panels rarely change management and frequently produce borderline results that are difficult to interpret.

2. Advanced Cardiovascular Risk Markers

Tests such as lipoprotein(a), apolipoprotein B, and coronary artery calcium (CAC) scoring can provide valuable insight into cardiovascular risk.

They are most useful in:

• Patients with a strong family history of early cardiovascular disease

• Individuals with intermediate risk where treatment decisions are uncertain

• Cases where traditional lipid panels do not fully explain risk

For example, a patient in Central Wisconsin with borderline cholesterol but a significant family history of early heart disease may benefit from additional testing to guide treatment decisions.

However, these tests are not necessary for routine screening in low-risk individuals.

3. Insulin Resistance and Metabolic Testing

Fasting insulin and HOMA-IR can provide insight into metabolic health, particularly in:

• Polycystic ovary syndrome (PCOS)

• Metabolic syndrome

• Patients with multiple risk factors for insulin resistance

Despite this, these tests are not standardized across populations. Reference ranges vary, and results can be influenced by numerous factors.

For most patients, hemoglobin A1c and fasting glucose remain the preferred tools for screening and management.

4. Iron Studies

Iron testing, including ferritin and transferrin saturation, is essential when:

• Anemia is identified

• Symptoms such as fatigue, hair loss, or restless legs are present

• Chronic disease or inflammatory conditions are suspected

A CBC alone may identify anemia, but it does not determine the cause. Iron studies provide that additional detail when clinically indicated.

Routine screening in asymptomatic individuals without risk factors is generally not necessary.

Commonly Marketed Tests: Understanding Their Limitations

1. Hair Tissue Mineral Analysis (HTMA)

HTMA is frequently marketed as a comprehensive nutritional assessment. However, studies have demonstrated poor reliability and lack of correlation with blood levels.

Results vary significantly between laboratories, making clinical interpretation inconsistent.

Where it may have value:

• Forensic toxicology to evaluate long-term exposure to substances

• Environmental health studies assessing population-level exposure

• Supplemental data in cases of suspected chronic heavy metal exposure

Even in these cases, HTMA is not used in isolation.

2. IgG Food Sensitivity Panels

IgG food testing is often promoted as a way to identify food intolerances. In reality, elevated IgG levels reflect exposure to foods, not adverse reactions.

Major allergy and immunology organizations do not recommend IgG testing for diagnosing food sensitivities.

Where proper testing is appropriate:

• IgE testing and skin prick testing for true food allergies

• Breath testing for carbohydrate malabsorption

• Structured elimination diets guided by a qualified professional

Unnecessary dietary restriction based on IgG testing can lead to nutritional deficiencies.

3. Thermography

Thermography has been marketed as an alternative to mammography for breast cancer screening. However, it lacks the sensitivity and specificity required for reliable detection.

The FDA and major cancer organizations do not support its use as a standalone screening tool.

Where it may have a role:

• Limited research settings as a supplemental tool

• Rare cases where traditional imaging is not feasible, under specialist guidance

4. Heavy Metal Testing

Routine screening for heavy metals in asymptomatic individuals is not recommended.

Where testing is appropriate:

• Occupational exposure

• Environmental exposure

• Clinical symptoms consistent with toxicity

In these cases, validated blood or urine testing is used.

5. Comprehensive Micronutrient Panels

Broad panels that test dozens of vitamins and minerals are often marketed as a way to optimize health.

In healthy individuals, these tests rarely change clinical management.

Where targeted testing is appropriate:

• Malabsorptive conditions

• Post-surgical patients

• Medication-related deficiencies

• High-risk populations

6. “Substance Testing” with Vials

Some patients may encounter testing methods where muscle strength is assessed while holding or being exposed to different substances, often in small vials. This approach is commonly associated with chiropractors.

The idea is that the body will show changes in muscle strength in response to specific foods, supplements, or environmental substances. While this may appear straightforward, current research has not shown this method to be reliable or valid for diagnosing medical conditions, food sensitivities, or toxic exposures.

Muscle testing can be influenced by many factors, including patient positioning, examiner pressure, and expectation. Because of this, results are often inconsistent and difficult to reproduce.

Where it may have limited use:

Some clinicians use forms of muscle testing as a general part of movement assessment or neuromuscular evaluation. In those contexts, it can provide information about strength, coordination, or motor control.

However, using muscle testing to determine reactions to specific substances, supplements, or vials is not supported by established clinical guidelines and does not replace validated testing methods.

What patients should know:

If a test is being used to suggest you need to avoid certain foods, take specific supplements, or undergo additional treatments, it is reasonable to ask:

• Is this method supported by research?

• Would standard medical testing confirm this finding?

• Will this result change my care in a meaningful way?

Our Commitment to Patients and Providers in Marathon, WI

At Marathon Spine & Wellness, we are committed to delivering care that is:

• Grounded in current research

• Aligned with established clinical guidelines

• Focused on meaningful outcomes

• Coordinated with your primary care provider and medical team

We believe the best outcomes come from providers working together.

Final Thoughts

Testing is a powerful tool when used correctly.

But more testing does not automatically mean better care.

The best decisions come from combining clinical expertise, evidence-based guidelines, and an understanding of the individual patient.

Marathon Spine & Wellness offers evidence-based chiropractic and movement care in Marathon, WI. Serving Marathon, Wausau, and Central Wisconsin.