Autoimmune panel labcorp

Additional Information. This test should be considered for the differential evaluation of encephalopathy of unknown origin with subacute onset of seizures, confusion, memory loss and/or behavioral change. For adults and patients with suspicion of cancer, additional evaluation of paraneoplastic autoantibodies is recommended (see Test No. 505500).

Autoimmune panel labcorp. ANA Multiplex with Reflex to 11 Antibody Cascade - This panel can be helpful in the diagnosis of autoimmune rheumatic diseases, including systemic lupus erythematosus, systemic sclerosis, Sjogren syndrome, mixed connective tissue disease, and rheumatoid arthritis. All specimens are screened for antinuclear antibodies (ANAs) with multiplex …

Testing in both serum and CSF is recommended for suspected encephalitis and/or paraneoplastic disorders to maximize diagnostic yield; refer to Autoimmune Neurologic Disease Panel With Reflex, CSF (3006052) for CSF testing. ||Separate from cells ASAP or within 2 hours of collection.

Glycemic Control for Adults with Diabetes. <7.0. N/A. Normal. 4.8–5.6. 70–99. For selected individual patients, providers might reasonably suggest even lower A1c goals than the general goal of <7%, if this can be achieved without significant hypoglycemia or other adverse effects of treatment. This panel simultaneously tests for ANA (using immunofluorescence) as well as the important specific autoantibodies associated with a positive ANA. It also includes testing for complement proteins, rheumatoid arthritis, Sjogren's syndrome, systemic sclerosis, polymyositis, anti-phospholipid antibody syndrome, and autoimmune thyroid disease. Additional Information. This test should be considered for the differential evaluation of encephalopathy of unknown origin with subacute onset of seizures, confusion, memory loss and/or behavioral change. For adults and patients with suspicion of cancer, additional evaluation of paraneoplastic autoantibodies is recommended (see Test No. 505500).Limitations. Antiactin antibodies have been reported at low levels in 3% to 18% of sera from the general healthy population. The presence of immune complexes in the patient's sample may produce false positives in this assay. Not all smooth muscle positive samples will have actin antibodies.LabCorp, short for Laboratory Corporation of America Holdings, is a leading provider of diagnostic testing and medical laboratory services. With numerous locations across the Unite...Testing Algorithm. If the indirect immunofluorescence assay (IFA) patterns suggest collapsin response-mediator protein (CRMP)-5-IgG, then CRMP-5-IgG IFA titer and CRMP-5-IgG Western blot will be performed at an additional charge. If the IFA pattern suggests antineuronal nuclear antibody type 1 (ANNA-1), then ANNA-1 immunoblot, ANNA-1 IFA titer ...Women's wellness. Patient Provider. No matching entries. Explore Labcorp's diagnostic testing by disease or condition for key treatment areas and specialties.The fertility journey can be difficult—this women's fertility blood test is your first step. ... test can assess ... Genetics, autoimmune conditions, and certain ...

Steel seawall panels are an essential part of any seawall project. They provide the strength and durability needed to protect your shoreline from erosion and wave action. But what ...This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for this test about biotin supplementation. Patients should be cautioned to stop biotin ... Labcorp test details for Autoimmune Dementia Profile ... Autoimmune Dementia Panel; ... Autoimmune Dementia Ab: 505548: Labcorp test details for Myasthenia Gravis Profile. Myasthenia gravis (MG) is an acquired disorder of neuromuscular transmission that is characterized by skeletal muscle weakness and fatigability on exertion that is exacerbated by repeated muscle activity. 2-7 This autoimmune disease is caused by antibodies directed toward receptors embedded in the motor endplate of the neuromuscular junction. This test should be considered for the differential evaluation of seizures of unknown origin that happen several times a day right from the beginning, focal seizures, and facial brachial dystonic seizures. For adults and patients with suspicion of cancer, additional evaluation of paraneoplastic autoantibodies is recommended; refer to Autoimmune ...

The ANA Screen, IFA, Reflex Titer/Pattern, Panel 1 evaluates 25 analytes from a single sample to provide clear, positive identification of specific antibodies for the most common autoimmune rheumatic diseases. This panel: Utilizes IFA with HEp-2 cells, which remains the gold standard 3. Tests for all analytes regardless of ANA results.Faux stone panels 4×8 are a great way to get the look of natural stone without the cost. Faux stone panels are made from a lightweight, durable material that can be used to create ...Autoimmune Hepatitis Diagnostic Panel - This panel may be helpful in the diagnostic evaluation of individuals with suspected autoimmune hepatitis (AIH). This panel includes an antinuclear antibody (ANA) immunofluorescence assay (IFA) screen, performed on human epithelial type 2 (HEp-2) cells, with reflex to titer and pattern; actin (smooth …Use. Epilepsy is a chronic seizure disorder characterized by seizures that usually recur unpredictably in the absence of a consistent provoking factor. Most epilepsy syndromes are genetically heterogeneous; pathogenic variants in different genes cause the same syndrome in different individuals or families, and only a fraction of the potential ...Diagnosis and treatment are often challenging and usually require testing of auto-antibodies. 1. Labcorp offers a myositis profile performed using RIPA and EIA methodologies. MyoMarker® 3 Plus profile includes both myositis-specific antibodies (MSA) and myositis-associated antibodies (MAA), as well as anti-SAE-1 antibody. Labcorp test details for Thyroid Profile With TSH Skip to main content ... Thyroid Panel With TSH: 90224-7: 001149: Thyroxine (T4) ug/dL: 3026-2: 000620: Thyroid ...

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Use. This test can assist in the diagnosis (paraneoplastic or idiopathic autoimmune) and aid distinction from other causes of myelopathy (sarcoidosis, vascular disease, multiple sclerosis). Early testing may assist in early diagnosis of occult cancer, prompt initiation of immune therapies, or both. Labcorp test details for Lupus Anticoagulant Comprehensive. Citrated plasma samples should be collected by double centrifugation. Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate. 1 Evacuated collection tubes must be filled to completion to ensure a proper blood to anticoagulant ratio. 2,3 The sample should be mixed immediately by gentle inversion at least ...Comprehensive Testing for Lupus and Related Autoimmune Syndromes. Lupus affects an estimated 1.5 million people in the United States. 1 Patients may present with variable clinical systemic manifestations that can imitate other chronic autoimmune diseases, often leading to diagnostic delays or misdiagnosis. Labcorp can deliver accurate and early …Limitations. Increases in CRP values are nonspecific. CRP is an indicator for a wide range of disease processes and should not be interpreted without a complete clinical history. Recent medical events resulting in tissue injury, infections, or inflammation, which may cause elevated CRP levels, should also be considered when interpreting results.

ANA are commonly found in a variety of autoimmune diseases. Antibody frequency increases with age in apparently healthy people. ANA patterns on Hep-2 slides provide only general clues about particles (chromatin, nucleosomes, and spliceosomes). ANA pattern (other than centromere pattern) are not reliably correlated with the presence of specific ...Comprehensive Testing for Lupus and Related Autoimmune Syndromes. Lupus affects an estimated 1.5 million people in the United States. 1 Patients may present with variable clinical systemic manifestations that can imitate other chronic autoimmune diseases, often leading to diagnostic delays or misdiagnosis. Labcorp can deliver accurate and early …This panel simultaneously tests for ANA (using immunofluorescence) as well as the important specific autoantibodies associated with a positive ANA. It also includes testing for complement proteins, rheumatoid arthritis, Sjogren's syndrome, systemic sclerosis, polymyositis, anti-phospholipid antibody syndrome, and autoimmune thyroid disease. Labcorp test details for Thyroid Antibodies. This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). Want to Speak to your Labcorp Representative? Our Services No matter your role in improving patient outcomes in rheumatology – as a healthcare provider, pharmaceutical company, or medical researcher – we can help. Rheumatoid Arthritis Tests to aid in the diagnosis, management of treatment, and monitoring of disease activity. Rheumatoid...The Labcorp Difference • ANA performed by immunofluorescence assay (IFA) with titer results reported at a 1:40 dilution. Reflexed markers by ELISA. • 1Consistency: seven patterns are identified automatically, including the titer result • High-quality results: detailed review process, including technologist confirmation of all resultsLupus Diagnostic Profile. 520073. Anti-Nuclear Ab by IFA (RDL) 42254-3. 520342. Lupus Diagnostic Profile. 520060. Anti-dsDNA Ab by Farr (RDL) IU/mL.Autoimmune dysautonomia encompasses disorders affecting the autonomic nervous system's components, triggered by neural-specific IgG or effector T cells. It presents as idiopathic or paraneoplastic, with variable onset and severity. Pandysautonomia manifests gradually with symptoms like impaired pupillary light reflex, anhidrosis, orthostatic ...If reflex testing is performed, concomitant CPT codes/charges will apply. Depending on base assay results, the following reflex testing may be performed: • If PT is above normal reference interval, Factor Activities II, V, VII and X shall be performed. • If PT is more than 2 seconds above normal reference interval, Factor Activities II, V ...Hereditary sensory and autonomic neuropathies are a group of disorders characterized by neuronal degeneration, loss of sensation, and reduced or loss of sensitivity to pain and temperature. There are eight distinctive subtypes, ranging from type IA to VIII. Phenotypes are varied, but ultimately result in autonomic nervous function upset ...The Labcorp Lupus Prognostic Profile can assess patient prognosis, including nephritis, neuropsychiatric, thrombotic and other cardiovascular risk. Our profile includes the following components: Anti-C1q Ab, IgG. Anti-Ribosomal P Ab. Anti-Cardiolipin Ab IgG. Anti-Cardiolipin Ab IgA. Anti-Cardiolipin Ab IgM. Anti-Beta2 Glycoprotein I IgG.When detected by the Meningitis/Encelphalitis Panel, herpesvirus results should be considered as the likely cause of meningitis/encephalitis only in appropriate clinical context and following expert consultation. If clinical suspicion for HSV-1/HSV-2 and/or Cryptococcus is high, it is recommended to perform an HSV-specific PCR test (Herpes ...

Labcorp test details for Thyroid Antibodies. This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R).

Description: Autoimmune Hepatitis (Liver Disease) Blood Panel (Labcorp) This test includes 3 tests which can help to determine if a person has Autoimmune Hepatitis.Autoimmune Hepatitis is a disorder in which the body's own immune system mistakenly targets cells in the liver.BURLINGTON, N.C.--(BUSINESS WIRE)--Sep. 13, 2021-- Labcorp (NYSE: LH), a leading global life sciences company, today announced that it has closed its acquisition of select operating assets and intellectual property (IP) from Myriad Genetics’ autoimmune business unit, including the Vectra ® rheumatoid arthritis (RA) assay. … Use. Hereditary sensory and autonomic neuropathies are a group of disorders characterized by neuronal degeneration, loss of sensation, and reduced or loss of sensitivity to pain and temperature. There are eight distinctive subtypes, ranging from type IA to VIII. Phenotypes are varied, but ultimately result in autonomic nervous function upset ... They are characterized by the infiltration of IgG4+ plasma cells and an elevated serum IgG4. 1. Common features of IgG4-RD include: 3. • Elevated serum IgG4 (≥135 mg/dL) • Clinical examination identifying swelling or masses in single or multiple organs. • Histopathological evidence of infiltrating IgG4+ plasma cells and fibrosis.Advanced blood test that provides important information including proprietary EC4d level to assist physicians any time they assess the condition of a patient with SLE. Therapeutic drug monitoring of methotrexate polyglutamates. Therapeutic drug monitoring of hydroxychloroquine in whole blood. AVISE testing provides state-of-the-art insight to ...Use. Anti-cN-1A autoantibodies in idiopathic inflammatory myopathy (IIM) patients appear to be disease-specific for sporadic Inclusion Body Myositis (sIBM) and are rarely detected in other autoimmune conditions. Anti-cN-1A autoantibodies have a moderate sensitivity, but their high specificity for sIBM may be helpful in the diagnosis of this ... This test should be considered for the differential evaluation of seizures of unknown origin that happen several times a day right from the beginning, focal seizures, and facial brachial dystonic seizures. For adults and patients with suspicion of cancer, additional evaluation of paraneoplastic autoantibodies is recommended; refer to Autoimmune ... Sep 13, 2021 · BURLINGTON, N.C. -- (BUSINESS WIRE)--Sep. 13, 2021-- Labcorp (NYSE: LH), a leading global life sciences company, today announced that it has closed its acquisition of select operating assets and intellectual property (IP) from Myriad Genetics’ autoimmune business unit, including the Vectra ® rheumatoid arthritis (RA) assay.

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Type 1 diabetes (T1D) is an autoimmune condition where the immune system mistakenly damages and destroys insulin-producing cells, called beta cells, making it difficult for the body to manage blood sugar levels. Symptoms of T1D develop slowly and are often mild or non-specific. A simple blood test can help you understand if you or your loved ...Dec 1, 2023 ... Testing for chronic inflammation. If you're concerned that your symptoms may be a sign of chronic inflammation, Labcorp OnDemand's Inflammation ...Vectra by Labcorp. Vectra, used with provider and patient assessments, helps guide better patient outcomes. Rheumatoid arthritis (RA) is a systemic disease that can be difficult to manage. Providers can add an objective measure to an assessment with Vectra. Vectra provides a personalized score by measuring 12 biomarkers and incorporating ...An order for Vectra® DA includes and requires an order for 12 biomarkers: VCAM-1, EGF, VEGF-A, IL-6, TNF-RI, MMP-1, YKL-40, Leptin, Resistin, SAA, CRP. These 12 biomarkers are required to generate the Vectra® DA test score. By ordering Vectra® DA, you are ordering all 12 biomarkers and are acknowledging that Labcorp cannot provide a Vectra ...... autoimmune disease may induce these high titers. There are now known groups ... Test Menu Right Side Menu. Find a Test · New & Updated Tests · Test Resources....Patients whose specimens were designated for other autoimmune phenotype evaluations (dementia, paraneoplastic, myelopathy, central demyelination syndromes, movement disorders, myasthenia gravis) were excluded.This panel can be helpful in the diagnosis of autoimmune rheumatic diseases, including systemic lupus erythematosus, systemic sclerosis, Sjogren syndrome, mixed connective tissue disease, and rheumatoid arthritis. All specimens are screened for antinuclear antibodies (ANAs) with multiplex immunoassay.LabCorp test details for Diabetes Autoimmune Test Group. ... Diabetes Autoimmune Test Group. TEST: 500597. Test number copied. CPT: 83519; 86337; 86341. Print ... ….

Lupus Diagnostic Profile. 520073. Anti-Nuclear Ab by IFA (RDL) 42254-3. 520342. Lupus Diagnostic Profile. 520060. Anti-dsDNA Ab by Farr (RDL) IU/mL.Patients with a chronic form of urticaria who are positive (> 10) with the CU index® have an autoimmune basis for their disease. A positive result does not indicate which autoantibody (anti-IgE, anti-FceRI or anti-FceRII) is present. ... Performing Labcorp Test Code: 820022 : Notes: Labcorp Test Code: 820022: CPT Code(s) 86352: Lab …17791-5. 056499. Systemic Lupus Profile A. 096343. Anti-DNA (DS) Ab Qn. IU/mL. 5130-0. Labcorp test details for Systemic Lupus Erythematosus (SLE) Profile A.Screening patients suspected to be at risk for liver fibrosis. AST to Platelet Ratio Index (APRI) is reported to be a simple, noninvasive, and readily available laboratory test index that can stratify patients with HCV and Non-Alcoholic Fatty Liver Disease (NAFLD) who are at high or low risk for significant fibrosis and cirrhosis with high degree of accurancy.CMP, CRP, ESR, Uric Acid, RF and ANA. Test Code: 249, 10231, 4420, 4418, 809, 905. Specimen Type: Blood. Description: Arthritis Comprehensive Panel with RF and ANA. The Arthritis Comprehensive Panel with RF and ANA is a package specifically designed to evaluate inflammation and may be used to assist in the diagnosis of rheumatoid arthritis.The combined analysis has a 98% autoimmunity detection rate, with 1.8% diabetic individuals remaining as autoantibody-negative. fewer than 3% of type 2 diabetics have positive antibodies. 1. Positive rate in new-onset type 1 diabetes patients: • GAD-65 antibodies = 68% positive. • ICA 512 antibodies = 72% positive.The CHEM-7 panel is a group of blood tests that provides information about metabolism. This basic metabolic panel is used to test blood sugar levels, blood acid/base balance, elect...Labcorp is a leading provider of medical laboratory services, offering a wide range of tests and screenings for individuals seeking to monitor their health or diagnose potential me... Autoimmune panel labcorp, Test Details · Use. Evaluate the nonspecific activity of infections, inflammatory states, autoimmune disorders, and plasma cell dyscrasias · Limitations. Optimum ..., Autoimmune Profile will be between $116.00 and $474.00. Autoimmune Profile cost minimal is in Private MD (Autoimmune Profile) with price $129.99. This laboratory test is available in 1 online lab test stores., LabCorp test details for Muscle Specific Kinase (MuSK) Antibodies. ... Secondary or reflex test to aid in the diagnosis of autoimmune ... By accessing or using the ..., Patients with a chronic form of urticaria who are positive (> 10) with the CU index® have an autoimmune basis for their disease. A positive result does not indicate which autoantibody (anti-IgE, anti-FceRI or anti-FceRII) is present. ... Performing Labcorp Test Code: 820022 : Notes: Labcorp Test Code: 820022: CPT Code(s) 86352: Lab …, Additional Information. This test should be considered for the differential evaluation of encephalopathy of unknown origin with subacute onset of seizures, confusion, memory loss and/or behavioral change. For adults and patients with suspicion of cancer, additional evaluation of paraneoplastic autoantibodies is recommended (see Test No. 505500)., The ENA test is sometimes called an ENA panel. This is because the ENA test is a panel of 4 to 6 blood tests taken from a blood sample. Each ENA panel checks for different autoantibodies. The ENA test can be a step that your health care team uses to diagnose diseases where the body's immune system attacks healthy tissues, called …, Autoimmune dysautonomia encompasses disorders affecting the autonomic nervous system's components, triggered by neural-specific IgG or effector T cells. It presents as idiopathic or paraneoplastic, with variable onset and severity. Pandysautonomia manifests gradually with symptoms like impaired pupillary light reflex, anhidrosis, orthostatic ..., Additional Information. This test should be considered for the differential evaluation of encephalopathy of unknown origin with subacute onset of seizures, confusion, memory loss and/or behavioral change. For adults and patients with suspicion of cancer, additional evaluation of paraneoplastic autoantibodies is recommended (see Test No. 505500)., IU/mL. 11572-5. 164065. Rheumatoid Arthritis Profile. 164915. Anti-CCP Ab, IgG/IgA. units. 57093-7. Labcorp test details for Rheumatoid Arthritis (RA) Profile., Vehicle fuse panels are commonly called fuse blocks. Here’s some information about the purpose of fuse panels and how to tell different automotive fuses apart. Many modern vehicles..., Labcorp test details for Cancer Antigen (CA) 125. ... Close Search Test Menu Test Menu. Search ... autoimmune diseases, and others). Markedly ..., Dystonia is a neurological movement disorder. It is characterized by persistent or intermittent muscle contractions causing abnormal, often repetitive movements, or body postures. The movements are usually patterned and twisting, and may resemble a tremor. Dystonia can affect one part of the body or can be generalized across multiple muscle groups. , Targeted phenotype-specific panels are preferred for the evaluation of autoimmune neurologic disease. Refer to the Autoimmune Neurologic Disease Panel …, Genetic Testing (NGS) Panels. Approximately 70-80% of epilepsy cases are believed to be due to one or more genetic factors. 2,3 Testing for epilepsy-related genes may be helpful for clarifying diagnosis and prognosis, selecting optimal treatments, and revealing information for family planning. 4 Labcorp offers two genetic testing options: Clinical Epilepsy NGS Panel (630550): 46 genes, and ..., Making an appointment with LabCorp online is a simple and convenient way to get the medical testing you need. Whether you’re looking for a routine checkup or need to get tested for..., ANA Test. Ferritin Test. Anti-CCP Test. RF Test. IgA Test. Routine Blood Tests. Less Common Tests. There are different autoimmune blood tests that aid in the diagnosis of autoimmune diseases. Autoimmune diseases are those in which the immune system attacks normal cells and tissues with inflammation ., IU/mL. 11572-5. 164065. Rheumatoid Arthritis Profile. 164915. Anti-CCP Ab, IgG/IgA. units. 57093-7. Labcorp test details for Rheumatoid Arthritis (RA) Profile. , Buy LabCorp: $689.00 . Sample Report Compare. Test Code: 165092. CPT Code(s): 86225,86235(x8) Also Known As: ANA-specific Antibodies. ... Individuals may order an ANA Comprehensive Blood Test Panel to assist in diagnosing autoimmune disorders, including: Systemic lupus erythematosus; Sjogren's syndrome; Polymyositis and dermatomyositis ..., See full list on verywellhealth.com , 17791-5. 252908. SLE Profile C. 096343. Anti-DNA (DS) Ab Qn. IU/mL. 5130-0. Labcorp test details for Systemic Lupus Erythematosus (SLE) Profile C., Tozzoli R, Bizzaro N, Tonutti E, et al. Guidelines for the laboratory use of autoantibody tests in the diagnosis and monitoring of autoimmune rheumatic diseases. Am J Clin Pathol. 2002 Feb; 117(2):316-334., This panel simultaneously tests for ANA (using immunofluorescence) as well as the important specific autoantibodies associated with a positive ANA. It also includes testing for complement proteins, rheumatoid arthritis, Sjogren's syndrome, systemic sclerosis, polymyositis, anti-phospholipid antibody syndrome, and autoimmune thyroid disease., The Labcorp Lupus Prognostic Profile can assess patient prognosis, including nephritis, neuropsychiatric, thrombotic and other cardiovascular risk. Our profile includes the following components: Anti-C1q Ab, IgG. Anti-Ribosomal P Ab. Anti-Cardiolipin Ab IgG. Anti-Cardiolipin Ab IgA. Anti-Cardiolipin Ab IgM. Anti-Beta2 Glycoprotein I IgG., Evaluating new onset encephalopathy (noninfectious or metabolic) comprising confusional states, psychosis, delirium, memory loss, hallucinations, movement disorders, sensory or motor complaints, seizures, dyssomnias, ataxias, nausea, vomiting, inappropriate antidiuresis, coma, dysautonomias, or hypoventilation using serum specimens The …, Additional Information. Autoimmune Neurology/Paraneoplastic CSF profile is a broad autoantibody panel that is more likely to capture causative autoantibodies and should be considered, especially when the clinical presentation is unclear, is shared by multiple antibodies, or has overlapping features of paraneoplastic syndrome or several ..., Antinuclear antibody (ANA) testing options. ANA testing can help in the differential diagnosis of many autoimmune disease states, including systemic lupus erythematosus (SLE), drug-induced SLE, mixed connective tissue disease (MCTD), Sjögren syndrome, limited scleroderma (CREST), diffuse scleroderma, rheumatoid arthritis (RA) and autoimmune ..., Result Code Name. UofM. Result LOINC. 520197. Autoimmune Liver Profile (RDL) 94700-2. 520073. Anti-Nuclear Ab by IFA (RDL) 42254-3. , Basic Metabolic Panel* Thyroid Panel* Cholesterol & Lipid Panel* Diabetes Risk Assessment* Women's Health Screenings. Cervical Cancer Screening (ages 21-65) A pap test and HPV test every 3 to 5 years depending on age, health and sexual history. STI Tests. Yearly screening for ages 24 and younger; Yearly screening for ages 25 and older …, Want to Speak to your Labcorp Representative? Our Services No matter your role in improving patient outcomes in rheumatology – as a healthcare provider, pharmaceutical company, or medical researcher – we can help. Rheumatoid Arthritis Tests to aid in the diagnosis, management of treatment, and monitoring of disease activity. Rheumatoid..., 602627. Allergens w/Total IgE Area 1. 602689. E072-IgE Mouse Urine. kU/L. 6181-2. CPT Statement/Profile Statement. Labcorp test details for Allergen Profile With Total IgE, Respiratory−Area 1., Result Code Name. UofM. Result LOINC. 520340. CTD Cascade. 520073. Anti-Nuclear Ab by IFA (RDL) 42254-3., This panel can be helpful in the diagnosis of autoimmune rheumatic diseases, including systemic lupus erythematosus, systemic sclerosis, Sjogren syndrome, mixed connective tissue disease, and rheumatoid arthritis. All specimens are screened for antinuclear antibodies (ANAs) with multiplex immunoassay., Reference Interval. • von Willebrand factor (vWF) activity: 50% to 150%. • von Willebrand factor (vWF) antigen: 50% to 150%. • Factor VIII activity: 50% to 150%. Average vWF levels (both antigen and activity) tend to vary by blood type. 6 One study found the mean vWF levels by blood type to be as follows: 7. • Type O: 74.8%.