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SCHEDULE AN APPOINTMENT Clinical Diagnostic Laboratories is a leading medical laboratory providing a wide variety of tests and services, such as routine blood work, H. Pylori tests, STD testing, drug screening, allergy testing, COVID-19, Flu, and much more. Use our easy scheduling tool below to make an appointment. Also, be sure to check out our FAQs page to address any problems you might have. You may also use our live chat feature on the bottom right, email us , or give us a phone call at (703) 430-1111 .

Thyroxine, Free (Free T4) Ordering Recommendation The preferred alternative to this test is Thyroxine, Free (Free T4) Methodology Quantitative Electrochemiluminescent Immunoassay (ECLIA) Performed Mon-Sat Reported Within 24 hours New York DOH Approval Status This test is New York DOH approved. Specimen Required Patient Preparation: Collect: Serum separator tube or plasma separator tube. Also acceptable: Green (lithium heparin), lavender Specimen Preparation: Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Storage/Transport Temperature: Refrigerated. Unacceptable Conditions: Grossly hemolyzed specimens. Remarks: Stability: After separation of cells: Ambient: 8 days; Refrigerated: 2 weeks; Frozen: 2 years Reference Interval Free Thyroxine, ng/dL 0-3 days 0.7-2.7 ng/dL 4-30 days 0.8-3.1 ng/dL 1-23 months 2-6 years 0.5-2.3 ng/dL 0.9-1.8 ng/dL 7-11 years 0.9-1.7 ng/dL 12-19 years 12-19 years 0.9-1.6 ng/dL 0.9-1.6 ng/dL 20 years and older 0.9-1.7 ng/dL Pregnancy, 1st Trimester 0.9-1.4 ng/dL Pregnancy, 2nd Trimester 0.7-1.3 ng/dL Interpretive Data Thyroxine, Free (Free T4) is the preferred test alternative for T Uptake and Free Thyroxine Index tests. Note CPT Code 84439 Components Component Test Code Component Chart Name LOINC 0070138 Thyroxine Free 3024-7 Aliases Free Thyroxine FT4, Serum Non-Protein Bound Tetraiodothyronine T4 Free, Serum T4, Free Thyroid Function Cascade

ACTH by Immunohistochemistry Ordering Recommendation Mnemonic Methodology Immunohistochemistry Performed Mon-Sat Reported 1-3 days New York DOH Approval Status This test is New York DOH approved. Specimen Required Patient Preparation: Formalin fix (10 percent neutral buffered formalin) and paraffin embed specimen (cells must be prepared into a cellblock). Protect paraffin block and/or slides from excessive heat. Transport tissue block or 5 unstained (3- to 5-micron thick sections), positively charged slides in a tissue transport kit Collect: Tissue or Cells Specimen Preparation: After drawing blood into an EDTA tube, label it with the patient's details. Keep the specimen at room temperature (15-30°C) if transporting within a few hours. For longer transport, place it in a biohazard bag within a cooler with ice packs, maintaining 2-8°C. Deliver it to the lab within 24 hours. Storage/Transport Temperature: Room temperature or refrigerated. Ship in cooled container during summer months. Unacceptable Conditions: Specimens submitted with non-representative tissue type. Depleted specimens. Remarks: Stability: Ambient: Indefinitely; Refrigerated: Indefinitely; Frozen: Unacceptable Reference Interval Components Available Separately Reference Interval Interpretive Data Note This test is performed as a stain and return (technical) service only. CPT Code 88342 Components Component Test Code 2003428 2003429 Component Chart Name ACTH by IHC LOINC ACTH Reference Number 94736-6 Aliases ACTH ACTH Antibody Staining ACTH by IHC

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Terms & Conditions 1. Acceptance of Terms Welcome to Clinical Diagnostic Laboratories ("we," "us," or "our"). By accessing or using our services, including our website and any related applications (collectively referred to as the "Services"), you agree to comply with and be bound by these Terms and Conditions. If you do not agree to these terms, please refrain from using our Services. 2. Services Offered Clinical Diagnostic Laboratories provides comprehensive diagnostic testing services including, but not limited to, blood panels, allergy tests, COVID tests, and Influenza tests. These services are available at our two separate locations: 2 Pidgeon Hill Dr., Suite 150, Sterling, VA 20165, and 44355 Premier Plaza, Suite 240, Ashburn, VA 20147. 3. Test Accuracy and Interpretation While we strive to provide accurate and reliable test results, it is important to note that medical tests may have limitations and potential variations. Test results should be interpreted by qualified medical professionals, and we strongly recommend consulting a healthcare provider for accurate diagnosis and treatment recommendations based on the test results. 4. Privacy and Data Security We are committed to protecting your privacy and the security of your personal and medical information. Our Privacy Policy outlines the types of data we collect, how it is used, and the measures we take to safeguard your information. By using our Services, you agree to our Privacy Policy. 5. Payment and Billing We offer various payment options for our services. Payment details, including pricing and payment methods, are available on our website and will be provided during the checkout process. Any additional fees, taxes, or charges associated with the services will be clearly communicated. 6. Appointments and Cancellations Appointments for tests are subject to availability and can be scheduled through our website or by contacting our customer service. If you need to cancel or reschedule an appointment, please provide notice in advance according to our cancellation policy, which will be communicated during the appointment scheduling process. 7. Test Preparation Instructions Specific tests may require certain preparations, such as fasting or medication restrictions. Customers are responsible for following these instructions to ensure accurate test results. 8. Turnaround Time for Results We strive to provide test results within a specific timeframe. However, factors such as test complexity and demand may impact the turnaround time. 9. Refund and Return Policy If services are paid for but not utilized, our refund and return policy applies. Details can be found on our website or obtained by contacting customer service. 10. Communication Channels For inquiries, support, or appointment scheduling, contact us via email, phone, or our designated customer portal. 11. Insurance and Coverage Information about insurance coverage, billing procedures, and reimbursement for services covered by insurance can be found on our website or by contacting us directly. 12. Laboratory Accreditation and Certifications Clinical Diagnostic Laboratories maintains specific accreditations and certifications that demonstrate our commitment to q uality and accuracy. 13. Health and Safety Measures To ensure a safe testing environment, we adhere to rigorous health and safety protocols for the protection of both patients and staff. 14. Dispute Resolution Any disputes will be resolved through mediation or arbitration, with the applicable jurisdiction specified. 15. Legal Disclaimers Our services are for diagnostic purposes only. Customers should consult healthcare professionals for medical advice and treatment. 16. User Accounts (if applicable) If you create a user account on our platform, terms related to account creation, management, and security apply. 17. Governing Law These Terms and Conditions are governed by and construed in accordance with the laws of the state of Virginia, without regard to its conflict of laws principles. 18. Conta ct Us If you have any questions, concerns, or feedback regarding these Terms and Conditions or our Services, please contact us at: Clinical Diagnostic Laboratories 2 Pidgeon Hill Dr., Suite 150, Sterling, VA 20165 44355 Premier Plaza, Suite 240, Ashburn, VA 20147 Email: info@clinicaldiagnosticlab.com Phone: (703) 430-1111 Fax: (703) 722-3890

Allergen, Food, Whole Egg, IgG Ordering Recommendation Not recommended for initial thyroid disorders testing. Distinguish thyroid autoimmune disorders from nonautoimmune disease or hypothyroidism. Mnemonic EGGWHOLE Methodology Quantitative ImmunoCAP Fluorescent Enzyme Immunoassay Performed Mon-Sat Reported 1-8 days New York DOH Approval Status This test is New York DOH approved. Specimen Required Patient Preparation: Collect: Serum separator tube (SST). Specimen Preparation: Separate serum from cells ASAP or within 2 hours of collection. Storage/Transport Temperature: Refrigerated. Unacceptable Conditions: Hemolyzed, icteric, or lipemic specimens. Remarks: Stability: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year Reference Interval Less than 30.21 mcg/mL Interpretive Data Values less than 2.00 mcg/mL represent absent or undetectable levels of allergen-specific IgG antibody. This test has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes. Compliance Category: FDA Note CPT Code 86001 Components Component Chart Name Allergen, Food, Whole Egg IgG Component Test Code 2011820 LOINC 45201-1 Aliases

We're Located in 3 Locations Last Name Email Phone Type your message here... Submit Thanks for submitting! A member of our team will respond to your inquiry as soon as possible. 2 PIDGEON HILL DR. SUITE 150 STERLING, VA 20165 44355 PREMIER PLAZA SUITE 240 ASHBURN, VA 20147 8318 ARLINGTON BLVD SUITE 103 FAIRFAX, VA 22031

Hemoglobin A1C Ordering Recommendation The Hemoglobin A1c test is a vital tool for diagnosing and monitoring diabetes mellitus, as well as assessing prediabetes. Diagnostic levels are marked by values greater than or equal to 6.5%, while monitoring involves tracking long-term glycemic control in diabetes patients. Additionally, values between 5.7% and 6.4% signal an increased risk of developing diabetes. For patients with hemoglobin variants lacking hemoglobin A, the Fructosamine test is preferred for monitoring long-term glycemic control. Mnemonic Methodology Quantitative Capillary Electrophoresis Performed Mon-Sat Reported Within 1-2 days New York DOH Approval Status This test is New York DOH approved. Specimen Required Patient Preparation: Collect: Lavender (EDTA) Specimen Preparation: Transport whole blood in original tube. (Min: 1 mL) Storage/Transport Temperature: Refrigerated. Unacceptable Conditions: Tissue or urine. Samples frozen after 8 hrs of collection and samples frozen at temperatures less than -70C. Remarks: Stability: Ambient: 72 hours; Refrigerated: 1 week; Frozen: 3 months (Must be frozen within 8 hrs of collection at -70 to -80C) Reference Interval Components Available Separately Reference Interval No Hemoglobin A1C Less than 5.7 percent No Estimated Average Glucose By report Interpretive Data HbA1c values of 5.7-6.4 percent indicate an increased risk for developing diabetes mellitus. HbA1c values greater than or equal to 6.5 percent are diagnostic of diabetes mellitus. For diagnosis of diabetes in individuals without unequivocal hyperglycemia, results should be confirmed by repeat testing. Note This assay accurately measures hemoglobin A1c even in the presence of hemoglobin variants, provided hemoglobin A is present. For patients with known hemoglobin variants who lack hemoglobin A, it is recommended to monitor long-term glycemic control using the Fructosamine test CPT Code 83036 Components Component Test Code 0070427 0070428 Component Chart Name Estimated Average Glucose LOINC Hemoglobin A1C 27353-2 4548-4 Aliases Hemoglobin A1C A1C A1C Hemoglobin Glycated Hemoglobin Glyco HGB Glyco-Hb Glycosylated Hemoglobin HA1C HbA1c Hemoglobin A1C Hemoglobin A1C, Blood

Tissue Transglutaminase (tTG) IgA Ordering Recommendation Recommended single screening test for IgA-competent individuals with suspected celiac disease. (IgA testing recommended to identify IgA competence.). May aid in monitoring adherence to gluten-free diet in celiac disease-confirmed patients. Mnemonic Methodology Semi-Quantitative Enzyme-Linked Immunosorbent Assay Performed Mon-Sat Reported Within 24 Hours New York DOH Approval Status This test is New York DOH approved. Specimen Required Patient Preparation: Collect: Serum separator tube (SST). Specimen Preparation: Separate serum from cells ASAP or within 2 hours of collection. Transfer 0.5 mL serum to a Standard Transport Tube. (Min: 0.3 mL) Storage/Transport Temperature: Frozen. Unacceptable Conditions: Refrigerated. Remarks: Stability: After separation from cells: Ambient: 48 hours; Refrigerated: 2 weeks; Frozen: 1 year (avoid freeze/thaw cycles) Reference Interval 3 U/mL or less 4-10 U/mL Negative Weak Positive 11 U/mL or greater Positive Interpretive Data Presence of the tissue transglutaminase (tTG) IgA antibody is associated with glutensensitive enteropathies such as celiac disease and dermatitis herpetiformis. tTG IgA antibody concentrations greater than 40 U/mL usually correlate with results of duodenal biopsies consistent with a diagnosis of celiac disease. For antibody concentrations greater or equal to 4 U/mL but less than or equal to 40 U/mL, additional testing for endomysial (EMA) IgA concentrations may improve the positive predictive value for disease. Note Testing for tTG IgA antibodies is recommended as an initial screen to identify patients at risk for celiac disease, and in whom duodenal biopsy should be performed to confirm disease. Some patients may have positive tTG IgA but negative EMA IgA and/or deamidated gliadin peptide (DGP) IgA results, which may be associated with false positivity or may indicate early disease. Close clinical correlation with continued testing may be indicated in patients with a family history of or who are at increased risk for celiac disease. A positive serology but normal biopsy may also indicate a gluten-free diet (GFD) prior to testing, latent disease, or early enteropathy. Re-challenge with a gluten diet may be recommended if GFD had been initiated prior to subsequent testing. In the case of latent or early disease, HLA DQ2 and DQ8 testing may be necessary to determine risk for disease. For patients with a high degree of suspicion for celiac disease and who test negative for tTG, EMA and/or DGP IgA tests, selective IgA deficiency should be considered and testing for tTG, EMA and/or DGP IgG antibodies performed. If serology is negative and suspicion for celiac disease is strong, intestinal biopsy may be warranted. Biopsy is particularly important for patients with diarrhea, steatorrhea, weight loss, failure to thrive, or with inherited genetic deficiencies such Down or Turner syndrome. CPT Code 86364 Components Component Chart Name Tissue Transglutaminase (tTG) Ab, IgA Component Test Code 0097709 LOINC 46128-5 Aliases Human RBC tTG Native tTG TG2 IgA Tissue Transglutaminase Tissue Transglutaminase Ab IgA tTG IgA tTG, IGA