An OPK can tell you that there is LH in your urine. That means that your body is gearing up to ovulate. An OPK can only tell if you are likely to ovulate, not that you have ovulated.
Armband Size Guide
Upper arm circumference
How to Measure
Size chart
| Size | Inches | cm |
|---|---|---|
| Standard Armband | 8.5″ – 15.5″ | 21.5 – 39 cm |
| Extra-Long Armband | 12.5″ – 18.5″ | 31.5 – 47 cm |
