Is the little strip of dye on an opk the exact same dye that's used in a hpt?
Edited to ask: is it the strip or the dye that detects the hcg/LH?
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Is the little strip of dye on an opk the exact same dye that's used in a hpt?
Edited to ask: is it the strip or the dye that detects the hcg/LH?