LH surge
Abbreviation: LH
The LH surge is a sharp, brief rise in luteinizing hormone that your body releases from the pituitary gland, typically 24 to 36 hours before an egg is released from the ovary. Detecting this surge is one of the most reliable ways to predict your most fertile days. Ovulation predictor kits measure LH in your urine and show a positive result when the surge is detected. Once you see a positive result, having intercourse within the next 12 to 36 hours gives the best chance of fertilisation. The surge itself lasts only one to two days.
What This Means for You
Understanding LH surge is an important part of your preconception journey. When you are trying to conceive, knowing terms like this helps you track your cycle accurately and communicate with your doctor or fertility specialist.
Explore our Trying to Conceive hubGood to Know
Women with polycystic ovary syndrome (PCOS) may have persistently elevated LH levels, which can cause false positives on standard ovulation tests. Hormone-specific digital OPKs that also measure oestrogen can be more reliable in this situation.
Source: https://www.pregnancybirthbaby.org.au/glossary-of-pregnancy-and-labour
Always consult your healthcare provider for personalised advice.
Free Tools for Singapore Parents
Put your knowledge into action with our free calculators and trackers.