Urine Home Pregnancy Test Calculator
Determine optimal timing and accuracy of home pregnancy tests
Pregnancy Test Calculator
Conception Method
Menstrual Cycle Information
Typical range: 21-40 days (average 28)
Test Information
Example Test Scenarios
Scenario 1: Optimal Timing
Situation: 28-day cycle, testing 1 day after missed period
Expected hCG: 50-100 mIU/ml
Test Accuracy: 99% with standard test
Recommendation: Highly reliable result expected
Scenario 2: Early Testing
Situation: Testing 5 days before missed period
Expected hCG: 5-25 mIU/ml (if pregnant)
Test Accuracy: 70-85% with early detection test
Recommendation: Consider retesting closer to missed period
Scenario 3: Very Early Testing
Situation: Testing less than 10 days post ovulation
Expected hCG: <5 mIU/ml (below detection)
Test Accuracy: 50-60% (high false negative rate)
Recommendation: Wait at least 14 days post ovulation
Factors Affecting Test Accuracy
Types of Home Pregnancy Tests
Testing Tips
Use first morning urine for best concentration
Wait until after missed period for highest accuracy
Follow test instructions exactly
Check expiration date before use
Confirm positive results with healthcare provider
Understanding Home Pregnancy Tests
How Pregnancy Tests Work
Home pregnancy tests detect human chorionic gonadotropin (hCG), a hormone produced by the placenta after implantation. hCG levels double approximately every 48-72 hours in early pregnancy, making timing crucial for accurate results.
Test Sensitivity Explained
25 mIU/ml (Standard): Most common, reliable after missed period
10 mIU/ml (Early Detection): Can detect pregnancy 4-5 days before period
6.3 mIU/ml (Ultra-Early): May detect pregnancy up to 6 days early
False Results Causes
False Positives (Rare)
- • Recent pregnancy loss
- • Fertility medications containing hCG
- • Certain medical conditions
- • Expired or faulty test
False Negatives (Common)
- • Testing too early
- • Diluted urine
- • Ectopic pregnancy
- • Very irregular cycles