How to Use Second Opinion Physician: Lab Testing, WalshDoc, Biotypes, Epigenetic Biotypes and Consultation FAQs

Second Opinion Physician is an online clinical service focused on biochemical and functional assessment. The practice uses laboratory testing, health history, WalshDoc questionnaires and physician interpretation to identify nutrient and metabolic patterns that may contribute to mood, behavior, cognitive and general functional symptoms.

Dr. David Epstein is an osteopathic physician with decades of experience in functional and nutrient-based medicine. He uses the Walsh Approach to interpret laboratory patterns associated with depression, anxiety, ADHD, autism, behavioral symptoms, cognitive concerns and medication response.

A new patient seeking a full biochemical evaluation should usually begin with the Comprehensive Biotype Panel and the initial Biotype Assessment with detailed report. Patients who are not ready for laboratory testing may begin with the WalshDoc Biotype Questionnaire and a free pre-consultation.

International patients may use consultation and report-review services when appropriate laboratory testing can be obtained locally. Ordering logistics, specimen requirements and physician-service limitations vary by country and should be reviewed during the free pre-consultation.

Use the main categories for Consultations, Labs, Walsh Approach education and Patient Questionnaires. New patients should use the guided recommendations near the top of this page. Patients who remain uncertain should schedule the free pre-consultation before ordering.

The free pre-consultation is a brief call used to clarify which laboratory panel or consultation option fits the situation. It is not a full medical consultation, detailed record review or treatment visit.

The core Comprehensive Biotype Panel generally includes:

• Whole blood histamine
• Serum copper
• Ceruloplasmin
• Plasma zinc
• Homocysteine
• 25-hydroxyvitamin D
• Complete blood count
• Comprehensive metabolic panel

These markers help assess methylation pattern, copper-zinc balance, vitamin D status, blood-cell patterns, liver and kidney function and other factors relevant to nutrient therapy.

It contains the core blood markers used for the initial Walsh assessment. Urinary pyrroles are generally ordered separately because they require a different specimen and handling process. Expanded methylation testing may also be added when direct measurement of SAM, SAH and methionine is clinically important.

The urinary pyrrole test uses a urine specimen with specific collection, light-protection and handling requirements. It may be ordered when the history suggests pyroluria or when low zinc, stress intolerance, poor dream recall, social anxiety or mood instability raises suspicion for chronic zinc and B6 depletion.

A focused copper panel may be appropriate when the primary concerns include anxiety, panic, irritability, insomnia, postpartum symptoms, estrogen-related worsening, previously high copper, low zinc or monitoring during zinc therapy. The panel should include serum copper, ceruloplasmin and plasma zinc.

Second Opinion Physician uses the expanded Genova panel with virtually all patients who present with a strong undermethylation pattern because SAM and methionine supplementation alone often fails to identify or correct the real bottleneck. The panel evaluates a broader pathway that may include SAM, SAH, methionine, homocysteine, serine, DMG, choline, betaine and related analytes, helping reveal opportunities in remethylation, transsulfuration, creatine demand and metabolic clearance.

No. Medication use does not automatically make whole blood histamine unusable or require direct methylation testing. The medication, dose, duration, symptom pattern and reason for testing should be reviewed before deciding which approach is most informative.

Yes. Individual tests and panels may be ordered without a consultation when permitted. This is often appropriate for established patients monitoring known abnormalities or for patients who want results before deciding whether to purchase a full evaluation.

Additional testing may include functional organic acids, oxidative stress markers, toxic-element and hair analysis, mitochondrial and gut-metabolic panels, immune-reactivity panels, hormone testing and other functional assessments.

The full assessment includes review of the health history, symptoms, current medications and supplements, relevant WalshDoc questionnaire findings, laboratory interpretation, biochemical pattern assessment and an individualized nutrient plan. A detailed written Biotype Report is prepared before the consultation call.

The initial Biotype Assessment and the bring-your-own-labs Biotype Assessment include the detailed written report. Brief telephone consultations are intended for focused discussion and do not include the same level of report preparation.

Yes, provided the necessary markers were obtained using acceptable methods and are recent enough to represent the current clinical picture. The bring-your-own-labs assessment is designed for this situation.

Yes. A brief consultation may be used to discuss symptoms, prior testing or which laboratory pathway is appropriate. A complete Biotype Report, however, generally requires the relevant laboratory data.

Yes. Existing CBC, CMP, vitamin D, homocysteine, thyroid, iron, hormone and other relevant results may be incorporated. Missing Walsh-specific markers may still need to be ordered.

A functional range is a narrower or clinically targeted interpretation of a laboratory marker rather than relying only on the broad laboratory reference interval.

Yes. Functional testing may be reviewed when the concern involves fatigue, oxidative stress, mitochondrial dysfunction, gut imbalance, hormones, toxic exposure, immune reactivity or other issues that may interact with mood and behavior.

WalshDoc is a structured questionnaire and reporting platform that organizes symptoms, history, likely biotype patterns and possible toxic-burden concerns. It helps patients understand which biochemical pathways may deserve further evaluation.

No. WalshDoc provides pattern recognition and educational interpretation. Laboratory testing and clinical review are used to confirm, modify or reject the patterns suggested by the questionnaire.

The Five Epigenetic Biotypes of Undermethylation refers to five epigenetic biotypes of undermethylation that expand on the Walsh Five Biotypes. They identify distinct metabolic and epigenetic patterns that may cause or sustain undermethylation and help explain why patients with similar undermethylation symptoms may require different treatment strategies. It evaluates methylation demand, mitochondrial energy and cofactors, creatine demand, pH and adenosine disposal, and transsulfuration, oxidative or toxic burden.

The Walsh biotype of undermethylation identifies the low-methylation pattern, but it does not always explain its cause. The Five Epigenetic Biotypes of Undermethylation separates undermethylation into five epigenetic biotypes based on mechanisms such as high creatine demand, low ATP, inadequate magnesium, elevated SAH, high homocysteine, low pH, impaired adenosine disposal, transsulfuration problems and toxic or inflammatory burden.

Creatine synthesis consumes a large share of methyl groups. Symptoms of creatine demand or deficiency become particularly important when SAM is low or when SAM and methionine supplementation have not helped. Low pH, elevated SAH and high homocysteine may indicate impaired adenosine and metabolic disposal. Sleep apnea, sedentary behavior, diet, kidney function and limited buffering capacity may therefore become part of the correction strategy.

Biotype Nutrients is the educational and nutrient-product resource organized around biochemical patterns. It is separate from the Five Epigenetic Biotypes of Undermethylation functional assessment and does not replace laboratory testing or physician interpretation.

The Biotype Questionnaire screens for symptom patterns associated with undermethylation, overmethylation, copper overload, pyroluria and toxic burden.

This expanded questionnaire adds more detailed questions about methylation barriers, environmental exposure, oxidative stress, gastrointestinal function and toxic-burden patterns.

A questionnaire-based supplement plan may provide a conservative starting framework, but it cannot confirm copper overload, zinc deficiency, pyroluria, vitamin D deficiency or the methylation pattern.

Testing is recommended when the questionnaire suggests copper overload, pyroluria, marked methylation imbalance, toxic burden, significant medical complexity, medication intolerance or when symptoms are severe, persistent or treatment-resistant.

Testing instructions and laboratory requisitions are provided after the order is processed. The patient completes specimen collection according to the instructions for each test.

Turnaround time varies by test. Standard blood tests may return sooner, while whole blood histamine, urinary pyrroles and specialty functional panels may take longer.

The report is prepared after all required laboratory results, health history and questionnaire information are available.

The consultation is scheduled after the report is complete so the discussion can focus on findings, nutrient priorities and questions raised by the written assessment.

Brief clarification questions may be addressed after the consultation. New symptoms, extensive treatment changes, review of additional testing or major revisions may require a follow-up consultation.

Follow-up testing is often considered after approximately eight weeks to three months of treatment, depending on the marker, dose, severity of imbalance and clinical response.

Common follow-up markers include copper, ceruloplasmin, plasma zinc, homocysteine, vitamin D, CBC and CMP. Whole blood histamine, urinary pyrroles or direct methylation testing may be repeated when clinically necessary.

The primary purpose of this service is biochemical assessment, laboratory interpretation and nutrient therapy. Psychiatric medications should be prescribed and managed by the patient’s treating physician or psychiatrist.

Yes. Many patients seek assessment because a medication is only partially effective, causes side effects or may not match the biochemical pattern.

No psychiatric medication should be stopped abruptly for testing. Medication and supplement use should be reported so the findings can be interpreted in context.

Biochemistry should first be stabilized and nutrient abnormalities should be corrected. If symptoms become stable and medication need appears reduced, tapering may then be discussed with the prescribing clinician.

No. Second Opinion Physician provides focused biochemical and functional assessment. Patients should maintain appropriate primary care, psychiatric care and emergency services.

Suicidal thoughts, psychosis, mania, inability to remain safe, severe behavioral escalation or risk of harm to others requires immediate local emergency evaluation.