Functional Lab Testing

Complete Blood Count (CBC) measures red cells, white cells, and platelets to evaluate anemia, infection signals, inflammation, and overall blood trends.

Computed Tomography (CT) scan creates cross-sectional images to evaluate injury, infection, tumors, stones, or organ changes and guide next steps.

Connecting Peptide (C-Peptide) test measures endogenous insulin output to differentiate diabetes types, assess beta-cell function, and guide therapy planning.

Conners Rating Scale gathers behavior ratings to evaluate ADHD symptoms and track attention and impulse control changes over time across settings.

Copper test measures copper in blood, urine, or tissue to assess deficiency or overload, support liver/neurologic evaluation, and guide monitoring.

Copper-to-Zinc Ratio compares copper and zinc status to assess inflammation-linked imbalance and guide targeted nutrition or supplement adjustments.

Corneal Topography maps corneal shape in 3D to evaluate astigmatism and keratoconus risk, support LASIK planning, and monitor progression.

Cortisol blood test measures cortisol (often morning) to evaluate adrenal output and circadian timing, supporting workup of fatigue or BP changes.

Cortisol Free Urine measures 24-hour urinary cortisol to evaluate cortisol excess or deficiency and support Cushing syndrome workup and follow-up.

Cortisol saliva testing samples cortisol across the day to evaluate diurnal rhythm and support workup of sleep disruption or stress patterns.

Cortisol-to-DHEA-S Ratio compares catabolic vs anabolic signals to evaluate stress-related adrenal patterns and guide hormone-focused follow-up.

Creatine Kinase (CK) measures a muscle enzyme to evaluate muscle injury, myositis risk, or statin-related symptoms and monitor recovery trends.

Creatinine test measures a kidney filtration marker to evaluate renal function trends, support early decline detection, and guide monitoring over time.

Creatinine Clearance combines blood and 24-hour urine to estimate GFR more directly, supporting kidney staging and medication dosing decisions.

Cystathionine test measures a transsulfuration marker to evaluate vitamin B6-dependent metabolism and methylation flow, guiding targeted follow-up.

Cystatin C measures a filtration protein to evaluate early kidney dysfunction when creatinine is unreliable, supporting more accurate risk stratification.

Cysteine test measures cysteine status to evaluate antioxidant precursor availability and amino acid metabolism, supporting fatigue or nutrient workups.

Cystoscopy uses a small camera to inspect bladder and urethra, supporting evaluation of hematuria, recurrent UTIs, stones, strictures, or tumors.

D-Dimer measures clot breakdown fragments to screen for possible DVT or pulmonary embolism and guide the need for imaging when symptoms suggest clots.

Defecography images rectum and pelvic floor during defecation to evaluate prolapse, outlet obstruction, and coordination issues behind constipation.

DHEA measures an adrenal hormone precursor to evaluate adrenal output and androgen balance, supporting workup of fatigue, mood shifts, PCOS, or aging.

DHEA-S measures a stable adrenal androgen marker to evaluate excess or low production and help localize sources of androgen-related symptoms.

Dexamethasone Suppression test checks cortisol response to dexamethasone to evaluate hypercortisolism and guide Cushing syndrome follow-up testing.

Diamine Oxidase (DAO) measures histamine degradation capacity to evaluate histamine intolerance patterns when symptoms are meal-triggered or allergy-like.

Digital Rectal Exam (DRE) is a brief rectum/prostate exam to screen for enlargement, tenderness, hemorrhoids, or masses and guide follow-up testing.

DGLA measures an omega-6 fatty acid to evaluate inflammatory eicosanoid balance and fatty acid metabolism, guiding nutrition choices when imbalance is suspected.

DHT measures a potent androgen metabolite to evaluate androgen-driven hair loss, acne, or prostate symptoms and guide targeted hormone follow-up.

DMG measures dimethylglycine status linked to methylation and energy pathways to evaluate possible imbalance and guide nutrition or supplement planning.