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Home › IVF, IUI & Beta hCG › hCG Trigger Shot Washout Calculator
✓ Ovidrel, 5k & 10k IU✓ Day-by-day clearance✓ Testing-out checker

hCG Trigger Shot Calculator: Ovulation Time, Washout & True Test Date

Enter your trigger medicine, date and time to see when you will most likely ovulate, when to do IUI or have intercourse, how the injected hCG clears day by day, and the first day a positive test can be trusted.

✓ Medically referenced & last reviewed: 13 Nov 2026

💉 Trigger Shot Ovulation & Washout Calculator

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5,000 IU vs. 10,000 IU vs. Ovidrel: Day-by-Day Trigger Clearance Chart

Estimated residual serum hCG (mIU/mL) after common trigger doses, modelled from published pharmacokinetic and clearance data. Red = likely positive on a 25 mIU/mL test, amber = faint line possible, green = likely negative.

Days post-triggerOvidrel 250 mcghCG 5,000 IUhCG 10,000 IU
Day 1140110220
Day 210986173
Day 38667136
Day 46752107
Day 5524184
Day 6413266
Day 7322552
Day 8252041
Day 9201532
Day 10151225
Day 1112920
Day 129715
Day 137612
Day 146< 510
Clearance varies with body weight, injection route and kidney function. A rule of thumb many clinics use is about 1 day per 1,000 IU, but some women still test positive up to 14 days after 10,000 IU. When in doubt, a quantitative blood test that rises over 48 hours is the gold standard.

“Testing Out the Trigger” Line Checker

Many women test daily from the day after the trigger until the line disappears. If the line fades and then comes back darker, that is pregnancy hCG. Enter your tests:

Tips for testing out a trigger shot

  • Use the same brand of test, at the same time of day (first-morning urine).
  • Take a photo of each test after the exact reading time — don’t read lines after the time window.
  • A darker line after day 10 that keeps getting darker over 48 hours is the key sign of a real pregnancy.

Frequently Asked Questions

How long does it take for a trigger shot to leave your system?
As a rough guide about 1 day per 1,000 IU: around 7–10 days for 5,000 IU or Ovidrel 250 mcg, and 10–14 days for 10,000 IU. Individual clearance varies, so “testing out” or a quantitative blood test is the best way to be sure.
When do you ovulate after an hCG trigger shot?
Ovulation usually happens 24–48 hours after the injection, most often around 36 hours. IUI is typically scheduled 24–36 hours after the trigger.
Can a trigger shot cause a false positive pregnancy test?
Yes. Ovidrel, Pregnyl, Novarel and other hCG triggers contain the same hormone that pregnancy tests detect. A Lupron (GnRH-agonist) trigger does not contain hCG and will not cause a false positive.
When should I take a pregnancy test after the trigger?
Wait at least 14 days after the trigger shot for a reliable result, or follow your clinic’s scheduled beta hCG date.
What does “testing out the trigger” mean?
Testing every 1–2 days from the day after the shot until the line disappears. If the line later reappears and darkens, that is pregnancy hCG rather than leftover medication.

⚠️ Official Medical Disclaimer

This calculator is for informational and educational purposes only. It produces mathematical estimates based on published clinical literature (ACOG, ASRM, ESHRE, NICE, WHO, NEJM) and is not a medical diagnosis, treatment plan, or method of contraception.

Every body and every treatment cycle is different. Always discuss your results with a qualified OB-GYN, reproductive endocrinologist, or fertility specialist before making any medical decision. Seek urgent care for heavy bleeding, severe one-sided pain, fainting, or fever.

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