Functional Lab Testing

Anion Gap calculates electrolyte differences to help evaluate acid–base status and clarify metabolic acidosis patterns or kidney-related imbalance on labs.

Ankle-Brachial Index compares ankle and arm pressures to help screen for peripheral artery disease and detect impaired leg circulation early in routine care.

Anorectal Manometry measures rectal and anal pressures to help assess pelvic floor coordination and inform evaluation of constipation or fecal incontinence.

Anti-CCP detects antibodies linked to rheumatoid arthritis to help assess autoimmune joint inflammation and inform earlier diagnosis and treatment planning.

Anti-Myosin Antibodies measure immune reactivity to cardiac myosin to help assess myocarditis and inform workup of inflammatory heart weakness with imaging.

Anti-Müllerian Hormone (AMH) estimates ovarian reserve to help assess fertility potential and inform IVF timing, cycle planning, or PCOS workup decisions.

ASCA measures antibodies to Saccharomyces cerevisiae to help assess Crohn’s-related immune patterns and inform IBD differentiation in symptomatic patients.

Anti-Sarcolemmal Antibodies detect immune activity against cardiac membranes to help assess myocarditis and inform evaluation in unexplained cardiomyopathy.

Anti-TPO detects thyroid peroxidase antibodies to help assess autoimmune thyroid disease and inform evaluation of thyroid symptoms and abnormal labs over time.

Anti-Troponin Antibodies identify interference antibodies to help explain unexpected troponin results and inform myocarditis evaluation and follow-up testing.

ANA screens for antinuclear antibodies to help assess systemic autoimmune activity and inform follow-up testing for joint pain, fatigue, rashes, or symptoms.

Apolipoprotein A1 measures the main HDL protein to help assess cardiovascular risk and inform lipid strategy beyond standard cholesterol panels in practice.

Apolipoprotein E (ApoE) genotyping identifies ApoE variants tied to lipid handling to help estimate Alzheimer’s and cardiovascular risk and inform planning.

Apolipoprotein B (ApoB) measures atherogenic particle burden to help assess cardiovascular risk beyond LDL and inform tailored lipid and lifestyle strategy.

ApoB-to-ApoA1 Ratio compares harmful vs protective lipoproteins to help assess heart risk in metabolic syndrome and track prevention response clearly over time.

Amsler Grid is a simple at-home screen for central vision distortion to help detect early macular changes and prompt timely follow-up eye imaging and care.

Arachidonic Acid measures an omega-6 fatty acid in blood to help assess inflammatory balance and fat metabolism patterns, informing nutrition strategy planning.

AA/EPA Ratio compares omega-6 to omega-3 status to help assess inflammatory tone and cardiometabolic risk, informing diet and supplement adjustments over time.

Arginine measures an amino acid tied to nitric-oxide production to help evaluate circulation, protein status, and metabolic balance for targeted nutrition.

Arterial Blood Gas (ABG) measures oxygen, carbon dioxide, and pH to help assess lung function and acid–base status, informing urgent respiratory care decisions.

Asparagine measures a circulating amino acid to help assess nutrition status and metabolic pathway stress and inform follow-up testing and nutrition changes.

Asparagine measures a circulating amino acid to help assess nutrition status and metabolic pathway stress to support follow-up testing and diet changes overall.

Aspartate Transaminase (AST) measures blood AST enzyme to help assess liver or muscle injury patterns, often with ALT, and guide follow-up testing as needed.

Asymmetric Dimethylarginine (ADMA) measures a nitric-oxide inhibitor to help assess endothelial function and refine cardiovascular risk in high-risk patients.

Audiometry tests hearing thresholds by air and bone conduction to help assess type and level of hearing loss and guide hearing device decisions over time.

Auditory Brainstem Response (ABR) records brainstem responses to sound to help assess hearing pathway function when audiometry isn't feasible in children.

Autonomic Reflex Screen measures heart rate, blood pressure, and sweat responses to help assess autonomic dysfunction behind dizziness, syncope, or POTS signs.

Band Neutrophils test measures immature neutrophils to help assess acute infection or inflammation response and support monitoring in severe illness workups.