Prothrombin time (blood clotting test) in Knoxville, TN costs $21 to $46. Here's every hospital's price.
3 hospitals in the Knoxville, TN metro area publish a cash price for prothrombin time (blood clotting test) (CPT 85610). We read their files every month so you don't have to.
Across the Knoxville, TN metro area, 3 hospitals list a cash price for prothrombin time (blood clotting test) (CPT 85610). The lowest is $21 at University Health System, INC, the median is $39 and the highest is $46 at Lafollette Medical Center. The most expensive hospital lists 2.3 times the cheapest for the same code.
The Knoxville, TN median of $39 is 64% above the national median of $24 across 1443 US hospitals with a cash price for this code.
3 of these hospitals also publish the rates they negotiated with insurers, from $2 to $638. With insurance you pay a share of the negotiated rate, which is sometimes higher than the cash price; you may ask for the cash price instead.
The files behind these prices are dated between January 2026 and April 2026. 7 other hospitals in the metro area have no readable price for this code: some publish no file, some block automated reading, some leave the code out. They are listed below so you can call them.
Sorted by cash price
Hospital facility fee onlyKnoxville · 13 mi · File Jan 2026
Powell · 8 mi · File Apr 2026
La Follette · 24 mi · File Apr 2026
What's in the price
The hospital facility fee for CPT 85610. The doctor, anesthesia and lab work usually bill separately.
Cash vs. insured
Cash is what you pay without insurance. With insurance you pay a share of the negotiated rate, which can be higher than cash. You may ask for the cash price.
What to say on the phone
"I'd like the self-pay price for CPT 85610, in writing, and whether it covers facility, physician and anesthesia."
About prothrombin time (blood clotting test)
CPT 85610 is a prothrombin time (PT), usually reported with INR. It measures how quickly blood clots and is used to monitor warfarin therapy, to check liver function and before surgery. It is a single blood test.
What the price covers
The laboratory analysis only. The blood draw is a separate small charge. Patients on warfarin often have this test monthly, so the price matters more than it looks; finger-stick INR at an anticoagulation clinic or at home is often cheaper.
Why prices vary
A PT/INR costs a laboratory very little to run, yet hospital list prices range from single digits to well over $100. For recurring tests, independent laboratories and anticoagulation clinics are usually far cheaper than hospital labs.
Questions to ask
- What is the self-pay price for 85610 and the draw fee?
- If I need this monthly, is there a cheaper standing arrangement?
- Can I use a home INR meter instead?
Hospitals in Knoxville, TN without a price for this procedure
Listed so you know who to call. The reason is what we found on their website.
- Blount Memorial HospitalWebsite blocks automated reading
- East Tennessee Childrens HospitalWebsite blocks automated reading
- Fort Loudoun Medical CenterWebsite blocks automated reading
- Fort Sanders Regional Medical CenterWebsite blocks automated reading
- Methodist Medical Center of Oak RidgeWebsite blocks automated reading
- Parkwest Medical CenterWebsite blocks automated reading
- Roane Medical CenterWebsite blocks automated reading