Urine Strips - Walmart.com
2021-7-29 · If your cycle is shorter than 21 days or longer than 38 days, consult a physician. If you do not know your cycle length, you may begin the test 11 days after your first period since the average cycle length is 28 days. Test procedure: Immerse the strip into the urine. Take the strip out after 3 seconds.
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