VetConnect PLUS screenshot of progesterone results for dog named Jenny Appelby

Catalyst Progesterone

Reliably predict canine ovulation with quantitative, in-house results

  • Share results during the visit. From whole blood to results in 12 minutes.
  • Count on precision and accuracy. Excellent correlation (r = 0.98) with the reference method.
  • Easily identify progesterone surges. Graph results and spot trends quickly using VetConnect PLUS.

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How to run Catalyst Progesterone


Running progesterone on a Catalyst One Chemistry Analyzer

  1. Enter the sample information on the IDEXX VetLab Station.
  2. Load the slide, sample, and reagent.
  3. Close the sample drawer and press the Start button on the analyzer.

Download the quick reference guide


Running progesterone on a Catalyst Dx Chemistry Analyzer 

  1. Enter the sample information on the IDEXX VetLab Station.
  2. Select the patient and sample type on your Catalyst Dx Chemistry Analyzer.
  3. Load your sample and the progesterone slide.
  4. Load the reagent and tap Run on the analyzer.


Dr. Graham Bilbrough’s white paper provides details about the correlation of Catalyst Progesterone to the reference method and the test’s precision in the range of clinical interest.

Read the white paper

Dr. Graham Bilbrough and a Catalyst slide

Your guide to serial monitoring with Catalyst Progesterone

Don’t miss the breeding window. Use quantitative, in-house results to reliably predict ovulation and estimate optimal fertility.

Ovulation and time of optimal fertility can be estimated by observing a distinct rise in progesterone concentrations, which is best identified with serial testing.


Progesterone concentration

Recommended action

Anestrus/ proestrus

<3.2 nmol/L

Retest in 2–4 days


Pre-LH* surge

3.2–6.3 nmol/L

Retest in 2–3 days


LH surge

6.4–9.5 nmol/L

Retest in 1–2 days


Post-LH surge/ preovulation

9.6–15.8 nmol/L

Retest in 1–2 days


At or near ovulation

15.9–38.2 nmol/L

Determine breeding schedule

  • Obtain a baseline measurement of progesterone and vaginal cytology at first signs of heat.
  • Increase frequency of progesterone testing when 75% of cornified superficial cells are noted on vaginal cytology (typically 3–4 days after a bloody vulvar discharge is noted).
  • Confirm a definitive and continued rise above 5.0 ng/mL to assess time of ovulation.
  • Determine breeding schedule based on desired method of insemination and semen type.

Important note: The above are guidelines, and individual dogs may vary. Progesterone is best used in conjunction with other monitoring techniques, such as observation of clinical signs, vaginal cytology, vaginoscopy, ultrasound, and additional hormonal testing.

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Get the most out of Catalyst Progesterone
Image of the IDEXX Catalyst One Chemistry Analyzer.
Fast, accurate results

See results for total T4, chemistry, electrolytes, and more, in one run with the Catalyst One Chemistry Analyzer.

Image of the IDEXX Catalyst Dx Chemistry Analyzer.
Multiple samples in minutes

Results for total T4, chemistry, electrolytes, and more, for multiple patients with the Catalyst Dx Chemistry Analyzer.


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IDEXX Test Promise

If an IDEXX test does not perform as promised, just call us and we’ll credit your IDEXX Points account with 100% of the test’s value.

Order tests & supplies

You can now order your companion animal SNAP tests and in-house analyzer consumables from an authorized IDEXX distributor or directly from us.

*LH is luteinizing hormone.