Pregnancy Test Reading Window: First Morning Urine & Avoiding False Negatives
NHS and Mayo Clinic guidelines on when to test, reading time limits, and why first morning urine matters. Plus how to avoid false negative results.
According to NHS and Mayo Clinic guidelines, timing is everything when taking a home pregnancy test. Testing too early or reading results outside the time limit can lead to confusion.
Why First Morning Urine?
First morning urine contains the highest concentration of HCG hormone. The ACOG recommends testing with your first bathroom visit for the most accurate results. If you test later in the day, diluted urine may cause a false negative early in pregnancy.
The Reading Window: Don't Wait Too Long
Most tests have a 3-5 minute reading window. Reading before 3 minutes may show incomplete results. Reading after 10 minutes can show evaporation lines that look like false positives. Our app timestamps your scan so you know exactly when to read.
Better Than Flo or Clue for Test Reading
While Flo app and Clue app are great for tracking your cycle, they don't scan pregnancy tests. Our AI scanner works like a Fertility Friend Line Reader or Lightbox—analyzing line intensity to detect faint positives that basic photo apps miss.
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