The short answer
Measures the intrinsic clotting pathway — used to monitor heparin therapy and screen for clotting factor deficiencies, measured from a standard blood draw. At TestWell it costs $24.99 plus a $6 lab fee, needs no fasting, and results post in 1–3 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp.
Hospital Lab
$95
cash pay
Other Labs
$35
+ lab fees
TestWell
$24.99
+ $6 lab fee
Activated Partial Thromboplastin Time (aPTT) measures how long it takes blood to clot through the intrinsic and common coagulation pathways. It's the standard test for monitoring patients on unfractionated heparin therapy, evaluating unexplained bleeding or bruising, screening for clotting factor deficiencies (including hemophilia A and B, von Willebrand disease, and Factor XI deficiency), and assessing for lupus anticoagulant antibodies. aPTT is often ordered alongside PT/INR for a complete coagulation workup, especially before surgery.
Sample Type
Blood draw
Fasting
Not required
Results In
1–3 business days
Performed At
Quest or Labcorp
1 biomarker tested
Your Activated Partial Thromboplastin Time (aPTT) results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 1–3 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you.
No fasting required. If you're on heparin or other anticoagulants, take your dose at your normal time and note when you took it for the lab.
A Activated Partial Thromboplastin Time (aPTT) test costs $24.99 at TestWell — $30.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Hospital outpatient labs typically bill around $95.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is HSA/FSA-eligible.
| Where you order | Price | One test, all-in | Notes |
|---|---|---|---|
| TestWell (drawn at Quest or Labcorp) | $24.99 | $30.99 | Includes the one $6 lab processing fee, charged once per order |
| Hospital outpatient lab, self-pay (typical) | $95.00 | $95.00 | Reference figure; hospital charges vary widely by facility and are often higher |
Lab test codes: Quest test code 763 · Labcorp test no. 005207 · BioReference code 0139-6. Competitor prices are read from the linked public pages and re-checked regularly; the labs' sites may add taxes or change prices without notice.
Compare more: Quest Diagnostics price list · Labcorp price list · Quest vs Labcorp · Lab test price checker
TestWell Price
$24.99
+ $6 lab processing fee at checkout
Get notified when this test becomes available
No insurance needed · HIPAA compliant
Frequently ordered together
Customers who ordered Activated Partial Thromboplastin Time (aPTT) also added these for a more complete health picture.
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