Blood LH Surges First: Understanding the 3 Hour Delay Before Urine LH Detection Understanding the timing of hormone surges is crucial for effective ovulation prediction! 📈 Blood luteinizing hormone (LH) levels rise rapidly at the start of the ovulatory surge, but did you know that urinary LH detection happens about three hours later? ⏳ This delay is due to physiological renal clearance and emphasizes the importance of grasping hormone dynamics when using diagnostic tests for fertility monitorin

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