A luteal phase defect (luteal phase deficiency) is when your uterine lining doesn’t thicken or grow enough to support a pregnancy. A thick uterine lining is necessary to grow a pregnancy. People with a luteal phase deficiency may struggle with infertility or miscarriage.
A luteal phase defect (or luteal phase deficiency) occurs when a person’s ovaries don’t produce enough progesterone after ovulation. You need to have enough progesterone for a healthy uterine lining. And you need a healthy uterine lining for pregnancy because it’s where a fertilized egg attaches and grows into a fetus. Progesterone tells your uterine lining to thicken or grow each menstrual cycle. With a luteal phase deficiency, the lack of progesterone causes the uterine lining to be less likely to carry a pregnancy.
There’s a lot of debate surrounding diagnosing and treating a luteal phase defect. Reproductive medicine organizations and providers don’t agree on diagnostic criteria or treatment for this condition. Despite this, healthcare providers agree that progesterone levels are important in pregnancy. If you’re having trouble conceiving, it’s best to schedule an appointment with a pregnancy care provider or fertility specialist.
The luteal phase is the part of your cycle that prepares your uterus for a potential pregnancy. It begins after ovulation and lasts until you get your period. In most people, the luteal phase lasts between 12 and 14 days.
Right before the start of the luteal phase, an egg leaves your ovary and travels through your fallopian tube. Progesterone levels rise to help prepare your uterine lining for pregnancy. If the egg becomes fertilized by sperm and travels to your uterine lining where it fertilizes, you become pregnant. If the egg isn’t fertilized by sperm and you don’t get pregnant, hormone levels drop, and you shed the thick lining of your uterus during your period.
Some people have a short luteal phase, which means their periods begin within 10 days of ovulation. Others have a long luteal phase and don’t get their periods for up 17 days or longer after ovulation.
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A luteal phase deficiency can make it hard to get pregnant and remain pregnant. This is typically due to low progesterone levels, which affect your uterus’s ability to support a pregnancy. For instance, you may be unable to get pregnant or you may get pregnant but lose the pregnancy shortly after (miscarriage).
Researchers are debating whether the luteal phase defect causes infertility or is a symptom of infertility. Talk to your healthcare provider if you’re struggling to conceive so they can determine the best treatment for you.
The two biggest risks of a luteal phase defect are infertility and miscarriage. A luteal phase deficiency prevents your uterine lining from growing thicker. A thick uterine lining creates the healthiest environment for egg implantation and fetal growth (the fertilized egg growing into a fetus).
Many people become aware of a problem with their luteal phases when they have difficulty getting pregnant or have miscarriages. Other symptoms of a luteal phase defect include:
Healthcare providers don’t know the exact cause of a luteal phase defect, but they do know it’s related to progesterone. It could be that your body isn’t making enough progesterone or that your uterine lining isn’t responding to progesterone. With either cause, your uterine lining doesn’t grow as it should.
People with a luteal phase defect often have short luteal phases. This means their periods start within 10 days of ovulation. Experts aren’t entirely sure why some people have shorter luteal phases than others. However, one study found that people who smoke cigarettes have shorter luteal phases than those who don’t smoke. Smoking may reduce your body’s ability to produce progesterone.
Health conditions that affect progesterone levels could increase your risk of a luteal phase defect. These include:
There isn’t one test or criteria to diagnose a luteal phase deficiency.
Your healthcare provider may recommend blood tests to check the following hormone levels:
Your provider may also perform an ultrasound to measure your uterine lining’s thickness. The thickness of your uterine lining can indicate progesterone is low or not working properly in your body.
It depends on your situation and your desires for pregnancy. If pregnancy is your goal, your healthcare provider may treat a luteal phase defect with medications like:
Other times, your provider may recommend lifestyle changes like reducing stress or reaching a healthy weight. If an underlying condition is disrupting your luteal cycle, treating that condition can often correct a luteal phase deficiency.
No, you don’t need IVF (in vitro fertilization) if you have a luteal phase defect. If you’re having trouble getting pregnant or have repeat miscarriages, your healthcare provider can help you explore the best treatment options based on your situation.
Yes, many people with a short luteal phase, or a luteal phase deficiency, have successful pregnancies. Discuss your desires for pregnancy with your provider so they can determine the best treatment for you based on your health history.
A note from Cleveland Clinic
Talk to your healthcare provider if you think you may be experiencing low progesterone or luteal phase deficiency. Fortunately, if a luteal phase defect is contributing to infertility, there are many treatment options available to you. Your provider can work with you to determine what treatment will be best for you based on your health history and desires for pregnancy.
Last reviewed by a Cleveland Clinic medical professional on 12/05/2023.
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