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To the Editor:—
In reply to Dr. Abarbanel, the new Fertility Tape's primary use is to aid the childless wife whose basal thermal shifts are often difficult to interpret. Ovulation may occur 3 days before and 3 days after the lowest day. Rhythm patients are instructed to avoid all coitus before and during the fertile phase as indicated by cervical glucose turning the tape from pink to blue, and for at least 3 negative (pink) days thereafter. We never state that all the women had to do was to avoid intercourse the nights the testing paper turned blue.The insemination date never proves that the sperm fertilized the ovum that same day. Sperm, especially from highly fertile donors, may fertilize 2 to 3 days later. Hence a negative test on insemination day does not mean that the patient may not have positive tests during the next few days. Diabetes, cervical
Doyle JB. The New Fertility Testing Tape-Reply. JAMA. 1961;176(6):553. doi:10.1001/jama.1961.03040190074032