The SFA medical abbreviation stands for superficial femoral artery, the main artery that carries blood down the front and inner thigh toward the knee. In peripheral artery disease, plaque narrows or blocks this vessel more often than almost any other leg artery.
You will see SFA in vascular ultrasound reports, angiogram notes, vascular surgery plans and wound clinic charts, usually with a side, such as R SFA for the right leg or L SFA for the left. This guide explains where the artery runs, how reports describe it, a naming trap with the nearby vein, and one meaning from nutrition.
At a glance
Stands for
Superficial femoral arteryWritten as
SFA, R SFA, L SFA, bilateral SFAsRuns from
The common femoral artery in the groin to the back of the kneeBecomes
The popliteal artery behind the kneeLinked condition
PAD, peripheral artery diseaseOther meanings
Saturated fatty acids in nutrition notes
Where the SFA medical abbreviation points in the body
Blood heading to the leg enters through the common femoral artery in the groin. Just below the groin, that vessel splits in two. The deep femoral artery, also called the profunda femoris, dives into the thigh muscles. The superficial femoral artery continues down the thigh, passes through a muscle tunnel called the adductor canal, and becomes the popliteal artery behind the knee.
Despite its name, the SFA is not just under the skin. It is called superficial only in contrast with the deep femoral branch. It supplies blood that eventually reaches the lower leg and foot through the popliteal and shin arteries.
How SFA disease shows up in reports
Plaque often builds up in the SFA, especially where it passes through the adductor canal. Reports describe how much narrowing there is and how long the diseased part is.
| Report wording | Plain meaning |
|---|---|
| R SFA | Right superficial femoral artery |
| Greater than 50% stenosis | More than half the channel is narrowed |
| Occluded | Fully blocked |
| Distal reconstitution | Blood refills the artery further down through side branches |
| Collaterals | Small detour vessels that grow around a blockage |
| Monophasic waveform | Dampened flow pattern beyond a narrowing |
Vascular clinic note: "Lifestyle limiting claudication R calf. Duplex: R SFA occlusion 10 cm. Plan angiogram, possible PTA." Calf pain on walking is traced to a long blockage in the right SFA, and a catheter procedure is being considered.
Tests and treatments linked to the SFA
A low ABI is often the first sign that something like SFA narrowing is present. Duplex ultrasound then maps blood flow along the artery, and a CTA, MRA or catheter angiogram may follow before any procedure.
Treatment depends on symptoms and how severe the disease is. It can include walking programs, stopping smoking, medicines that lower clot and cholesterol risk, balloon angioplasty, often written PTA, stent placement, or a bypass graft that routes blood around the blocked part, often from the femoral artery to the popliteal artery.
A naming trap: the superficial femoral vein
Next to the SFA runs a vein that older reports call the superficial femoral vein. That name is misleading, because the vessel actually belongs to the deep venous system of the leg. A clot there is a DVT, not a minor surface clot, and it usually needs treatment. Because the old name led some readers to underestimate clots, many imaging groups now call it simply the femoral vein.
So if you see superficial femoral on an ultrasound report, check whether the word after it is artery or vein. The two are evaluated for very different reasons.
SFA in nutrition notes and how to tell meanings apart
In diet and cholesterol counseling, SFA can stand for saturated fatty acids, the type of fat found mainly in fatty meats, butter, cheese and some tropical oils. A dietitian's note might say "limit SFA intake." The setting makes the difference obvious: a vascular or imaging note means the artery, while a nutrition note about fats means the fatty acids.
For other vessel scans, browse the imaging and lab shorthand index.
Vascular findings are best explained by the team that reviewed your images and examined your legs. Bring your report to your vascular specialist or primary care clinician with any questions.
Frequently asked questions
What does SFA stand for in medical terms?
SFA usually stands for superficial femoral artery, the main artery running down the thigh. In nutrition notes it can also mean saturated fatty acids.
What does R SFA mean on an ultrasound?
R SFA means the right superficial femoral artery. Reports add the side so the team knows which leg the finding refers to.
What is an SFA blockage?
An SFA blockage is a narrowing or full closure of the thigh artery, usually caused by plaque from peripheral artery disease. It can cause calf pain when walking.
Is the superficial femoral vein a deep vein?
Yes. Despite its old name, the superficial femoral vein is part of the deep vein system, and a clot there counts as a DVT. Many reports now call it the femoral vein.
How is SFA disease treated?
Options range from supervised walking and medicines to balloon angioplasty, stents or bypass surgery. Your vascular team chooses based on symptoms and test results.