Dictionary TryingPregnancy TestFirst-Morning Urine First-Morning Urine (FMU) Published: November 4, 2017 What Does First-Morning Urine (FMU) Mean? First-morning urine is the sample of urine that is expelled immediately after waking up in the morning and is recommended for use with most home pregnancy tests. This is because the first urine a pregnant woman produces in a day contains the highest concentration of human chorionic gonadotropin (hCG). Therefore, using the first-morning urine can better predict pregnancy in its early stages when hCG levels are at their lowest. FertilitySmarts Explains First-Morning Urine (FMU) Home pregnancy tests detect the level of hCG in a woman’s urine. In early stages of pregnancy, the concentration of hCG may not be high enough in urine produced throughout the day to detect pregnancy. However, the first-morning urine contains the highest concentration of hCG. As a result, a sample of urine from first thing in the morning is more likely to provide accurate test results in early pregnancy. Since hCG levels rapidly increase in a developing pregnancy, a urine sample from any time of day can be used to accurately predict pregnancy by the fourth or fifth week. Therefore, a sample of the first-morning urine is most important during testing in early stages of pregnancy. Synonyms First Morning Urine Share This Term> Related Terms Squinter Pregnancy Test Big Fat Negative Big Fat Positive Related Reading 14 Onesies that Celebrate IVF Babies IVF Pregnancy Announcements Fertility Podcasts Relatable Words After a Miscarriage Let’s Stop Arguing About Whether or Not Stress Causes Infertility Books About Infertility Tags Trying Trying Pregnancy Test Pregnancy Trending Articles Pregnancy IVF Pregnancy Announcements Egg Retrieval From Eggs to Blastocysts: Understanding IVF Attrition Cervical Mucus Identifying Stages of Cervical Mucus Artificial Insemination (AI) Implantation Calendar: What is Happening During the Two Week Wait?