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1 ng/mL = 3.18 nmol/L · HV-FIA-3000 Standard
Quantitative Theriogenology Workstation
Progesterone & Whelping Timing Lab
Quantitative ng/mL & nmol/L interpretation, reverse progesterone C-section thresholds, and multi-test cycle/whelping planning.
Canine Progesterone Level Calculator & Ovulation Interpreter
Quantitative ng/mL and nmol/L canine progesterone analyzer interpreter calibrated for Healvet HV-FIA-3000 and IDEXX reference intervals across breeding ovulation timing and reverse progesterone C-section monitoring.
Lab Unit
Test Sample:
0 → 25+ ng/mL Fertility Spectrum1 ng/mL = 3.18 nmol/L
<2 Base2–5 LH5–10 Ov10–20 Peak>20 Late
Enter a progesterone value above (or tap a sample button) for instant stage classification and breeding/whelping protocol actions.
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Live Highlighted Lab Reference
Official Protocol Chart (Ovulation Timing)
Healvet HV-FIA-3000 Protocol
Canine Ovulation & Fertility Chart
Reference Standard
IDEXX r > 0.94
| ng/mL | nmol/L | Biological Stage | Clinical Recommendation |
|---|---|---|---|
| < 2.0 ng/mL | < 6.4 nmol/L | Baseline / Proestrus Retest in 3–4 Days | Follicular Baseline — Hold Breeding Progesterone is at anestrus or early proestrus baseline. Re-draw every 72–96 hours as vulvar swelling softens and serosanguinous discharge lightens. |
| 2.0 – 4.9 ng/mL | 6.4 – 15.6 nmol/L | LH Surge / Rising Estrus Retest Every 48 Hours | Day 0 Biological Clock — Alert Stud / Shipper Pre-ovulatory luteinization marks the LH surge (~2.0–3.0 ng/mL). Lock in today as Day 0 to project whelping (LH + 65 days) and reserve cooled semen collection. |
| 5.0 – 9.9 ng/mL | 15.9 – 31.5 nmol/L | Ovulation Window Retest in 24 Hours | Ovulation Occurring — Oocytes Immature Primary oocytes release around 5.0–8.0 ng/mL (~48 hrs post-LH) and require 48–72 hours in the oviduct to mature before fertilization is possible. |
| 10.0 – 20.0 ng/mL | 31.8 – 63.6 nmol/L | Peak Fertile Window Active Breeding Window | PEAK FERTILITY — BREED NOW Secondary oocytes are mature (Days 1–3 post-ovulation). Optimal breeding window for Natural / Vaginal AI (10–18 ng/mL), Chilled AI (12–20 ng/mL), and TCI (15–20 ng/mL). |
| > 20.0 ng/mL | > 63.6 nmol/L | Late Window / Closing Verify Days Post-LH | Window Closing — Urgent TCI / Surgical Only Only fertile if confirmed within Days 4–6 post-LH (frozen/surgical TCI). Without earlier serial tests, a single >20 ng/mL value cannot distinguish late fertility from diestrus. |
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Nov 14, 2026
rawandpawco.com/lab/progesterone-tool
Clinical Reference & Theriogenology FAQ
Collapsed to keep calculators front & center · Tap any topic to expandTiming Rules Every Kennel Tracks
Why Quantitative Immunofluorescence (r > 0.94) Beats Color-Change Strips+
Quantitative FIA · r > 0.94
Qualitative color-change cards cannot separate a 2.4 ng/mL LH surge from a 4.8 ng/mL ovulation rise. Quantitative immunofluorescence tracks daily doubles across 0.2–100 ng/mL with strong IDEXX lab correlation.
Inspect Healvet 3000 Suite →Oocyte Maturation Math: Why Fresh, Chilled & Frozen Semen Require Different Days+
Oocyte Maturation Math
Canine eggs release immature at ovulation (5.0–8.0 ng/mL) and need 48–72 hours to mature. Fresh semen waits 5–7 days in the reproductive tract; chilled lasts 48–72 hours; frozen semen has <24 hours and must land directly inside peak maturity.
Reverse Progesterone (< 2.0 ng/mL), Fetal Heart Rate & the 4-Hour IgG Window+
Whelping · 0–4 Hr Window
Rectal temperature fails to drop cleanly in ~65% of dams. Confirm Reverse P4 < 2.0 ng/mL alongside Doppler fetal heart rates (220–240 bpm healthy; <160 bpm distress), and support newborn gut immunity within the 4-hour IgG window.
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