Prekallikrein Deficiency: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Prekallikrein Deficiency?
A primary care doctor is often the first to spot an abnormal clotting test and may refer the patient to a hematologist, a blood specialist, to confirm the diagnosis. After that, primary care can usually manage the condition with occasional lab work.
What it is
Prekallikrein deficiency is a rare blood condition in which the body does not make enough of a protein called prekallikrein, which helps blood clot. Most people never notice anything wrong; doctors often find it by accident on routine blood tests. It is also called Fletcher factor deficiency and is inherited through genes.
Symptoms
Most people have no symptoms at all. Unlike some other clotting problems, it usually does not cause easy bruising or serious bleeding, even during surgery. The main problem is confusion in the lab: abnormal blood tests can lead doctors to suspect a more serious disorder and order extra tests.
Causes and who gets it
The condition is caused by changes, called mutations, in a gene called KLKB1, which carries the instructions for making the prekallikrein protein. A person must inherit a changed copy from both parents. It is very rare, and many cases likely go undiagnosed.
How doctors diagnose it
Doctors often first notice the condition when a routine clotting test called a PTT, or partial thromboplastin time, comes back longer than normal despite no bleeding problems. A lab can confirm it by measuring prekallikrein in the blood or checking the KLKB1 gene.
Treatment
Most people need no treatment, because the condition usually does not cause bleeding. Doctors may simply note the diagnosis in the medical record so future blood tests are not misread. If surgery is planned, the care team may run extra clotting tests ahead of time.
When to see a doctor
Anyone with unusual bruising, frequent nosebleeds, or bleeding that takes a long time to stop should see a doctor. These symptoms usually come from more common causes but deserve a checkup. Tell any surgeon or dentist about the diagnosis before a procedure.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works alongside insurance. Either can handle most of the care, ordering lab tests and explaining results, and would refer to a hematologist if bleeding symptoms appear or surgery is planned.
Common questions
Is prekallikrein deficiency dangerous?
For most people, no. It usually causes no bleeding or other health problems. The main risk is confusion in lab results, which can lead to unnecessary worry or extra tests.
Can I pass this condition to my children?
Yes, it can be inherited. A child must receive a changed copy of the KLKB1 gene from both parents to have the condition. A genetic counselor can explain the chances in more detail.
Do I need treatment before surgery?
Usually no, because the condition rarely causes bleeding. Your doctor may still order extra clotting tests before a procedure to be safe. Every case is a little different.
Why did my blood test look abnormal if I feel fine?
The prekallikrein protein is part of the clotting chain that lab tests measure. When it is missing, the test time looks longer even though your body clots normally in real life.
Sources
- NIH Genetic and Rare Diseases Information Center - Prekallikrein deficiency
- MedlinePlus Genetics - KLKB1 gene
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
