Luteinizing Hormone (LH) Urine Test

What is the purpose of this test: This test is performed to accurately determine when a woman will ovulate.
How to prepare:
  • This test requires a urine sample.
  • It is recommended that the test be performed at the same time every day, preferably with first morning urine.
  • Avoid drinking large quantities of liquid in the hours before testing.
  • Start testing 2 to 4 days before the estimated date of ovulation.
  • Afterwards, test every day until you obtain a positive result.
  • Each of the test kits sold in your pharmacy have their own specifications. It is important to read the instructions carefully to ensure the validity of test results.
Target values:
  • Positive result.

General Information

Ovulation prediction tests detect the presence of luteinizing hormone. This hormone is present in small amounts during most of the menstrual cycle but rises a few days before ovulation.

When should the test be done?

Testing should start 2 to 4 days before the estimated date of ovulation. If the date is unknown, it can be calculated - in approximate terms - based on the length of the menstrual cycle. Knowing that a cycle starts with the first day of your menstrual period and that ovulation occurs 14 days before the start of your menstrual period, calculating the date is relatively simple. For example, for those with a 28-day menstrual cycle, the ovulation date is estimated to be on day-14 and tests should therefore start on day-11 of the cycle. If the cycle is shorter, tests should start earlier and, if the cycle is longer, tests should start later.

How are results interpreted?

If results are positive
Ovulation will occur within the next 12 to 36 hours.

Factors that can affect test results

Certain factors can cause inaccurate results. They include:

  • The use of certain drugs that stimulate ovulation
  • An excessive intake of water before the test
  • A recent pregnancy or being newly pregnant
  • Menopause
  • Polycystic ovarian syndrome
  • Untreated hypothyroidism
  • Starting testing too early in the menstrual cycle

© Copyright Vigilance Santé

The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.

Find a Pharmacy