--- title: Activated Partial Thromboplastin Time (aPTT) Test type: biomarker url: "https://www.test-well.com/biomarkers/activated-partial-thromboplastin-time-aptt" also_known_as: - aptt - activated partial thromboplastin time (aptt) - activated partial thromboplastin time - partial thromboplastin time (ptt) - ptt category: Metabolic Health units: - seconds - sec order_price_usd: 54.99 order_item: PT and PTT (Prothrombin & Partial Thromboplastin Time) order_url: "https://www.test-well.com/tests/pt-and-ptt" reviewed_at: 2026-09-05 --- # Activated Partial Thromboplastin Time (aPTT) > Activated Partial Thromboplastin Time (aPTT) is measured with a standard blood draw; no fasting is needed. A typical reference range is 25.0 – 35.0 seconds. At TestWell it's $54.99 all-in as PT and PTT (Prothrombin & Partial Thromboplastin Time), results in 1–3 business days, drawn at Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis. Also known as: aptt, activated partial thromboplastin time (aptt), activated partial thromboplastin time, partial thromboplastin time (ptt), ptt. ## Key facts | Fact | Value | | --- | --- | | Units | seconds / sec | | Sample | Blood draw | | Fasting | Not required | | Results | 1–3 business days | | Price | $54.99 | | Labs | Labcorp | ## What does Activated Partial Thromboplastin Time (aPTT) measure? How long it takes blood to clot via the intrinsic pathway. Used to monitor heparin therapy and screen for clotting disorders. ## What is the normal range for Activated Partial Thromboplastin Time (aPTT)? | Population | Reference range | | --- | --- | | age 18+ | 25.0 – 35.0 seconds | Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them. ## What does a high Activated Partial Thromboplastin Time (aPTT) mean? Often reflects heparin therapy, factor deficiencies, or specific clotting inhibitors. ## How do you get tested for Activated Partial Thromboplastin Time (aPTT)? | Order | Type | Price | Includes | | --- | --- | --- | --- | | [PT and PTT (Prothrombin & Partial Thromboplastin Time)](https://www.test-well.com/tests/pt-and-ptt) | Single test | $54.99 | This marker | ## Quest vs Labcorp vs BioReference | Lab | Available | Price | Notes | | --- | --- | --- | --- | | Quest Diagnostics | No | — | Not offered through Quest for this test. | | Labcorp | Yes | $54.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | BioReference (NY & NJ) | No | — | Not available in NY/NJ for this test. | - [What a high Activated Partial Thromboplastin Time (aPTT) means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/activated-partial-thromboplastin-time-aptt/high) ## Common questions about Activated Partial Thromboplastin Time (aPTT) ### Do I need a doctor's order to test my activated partial thromboplastin time (aptt)? No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor. ### How long does it take to get Activated Partial Thromboplastin Time (aPTT) results? Most Activated Partial Thromboplastin Time (aPTT) results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal. ### How much does a Activated Partial Thromboplastin Time (aPTT) test cost? Our PT and PTT (Prothrombin & Partial Thromboplastin Time) starts at $54.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted. ### Do I need to fast before my Activated Partial Thromboplastin Time (aPTT) test? Fasting is not required for the Activated Partial Thromboplastin Time (aPTT) test. You can have your blood drawn any time of day. ### Which lab will process my Activated Partial Thromboplastin Time (aPTT) test? Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations. ## Sources - [AACC Lab Tests Online](https://www.testing.com/tests/partial-thromboplastin-time-ptt-aptt/) - [MedlinePlus (NIH) — Partial Thromboplastin Time (PTT) Test](https://medlineplus.gov/lab-tests/partial-thromboplastin-time-ptt-test/) ## Related biomarkers - [Glucose](https://www.test-well.com/biomarkers/glucose) - [Creatinine](https://www.test-well.com/biomarkers/creatinine) - [eGFR](https://www.test-well.com/biomarkers/egfr) - [BUN](https://www.test-well.com/biomarkers/bun) - [ALT](https://www.test-well.com/biomarkers/alt) - [AST](https://www.test-well.com/biomarkers/ast) - [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup) - [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter) - [All biomarkers](https://www.test-well.com/biomarkers) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-05. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/biomarkers/activated-partial-thromboplastin-time-aptt Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.