Progesterone: requirements for a good PT

Veterinary drugs including antibiotics, growth hormones (like progesterone, estradiol- 17β…), and antihelminths are used legally and illegally for disease control and growth promotion in livestock animals.

Hormones are used for a number of reasons in animal-based food production. Some such reasons are:

  • Young animals gain weight faster
  • Reduced waiting time
  • Reduction in the average amount of feed required by an animal
  • Increased milk production
  • Increased overall efficiency and profitability of meat and dairy industries.

Human health concern

All these substances used for growth promotion in food-producing animals have provoked much debate on the safety of livestock products for human consumption. In fact, in the last 20 years, many studies have been performed to estimate the real probability of human health impact resulting from the consumption of animal products (e.g. milk and meat) treated with these substances.


In particular, progesterone is a naturally occurring steroid hormone and it must be regarded as a natural constituent of food of animal origin (dairy products and tissues/organs). However, in veterinary medicine, progesterone is used in cows and mares for therapeutically and zootechnical purposes. For example, it is administered to cattle in combination with estradiol benzoate to increase rates of weight gain and feed efficiency, this speeds up the time it takes for the animal to grow and reduces feed costs.

Since it is not possible to differentiate between the hormones produced naturally by the animal and those used to treat the animal, it is difficult to determine exactly how much of the hormone used for
treatment remains in the meat or the milk.

Animal health concern

Often livestock animals that live in these systems never graze, with food being delivered to them. Key animal welfare problems associated with feedlots include:

  • muddy conditions,
  • poor handling
  • heat stress.

Furthermore, the use of Progesterone during the pregnancy of the cattle could cause an increase in the incidence of uterine diseases.


For these reasons, even if the progesterone is a naturally steroid hormone and it is normal to find it as a constituent of food of animal origin, it is really important to monitor that its quantity in products intended for human consumption remaining low, in order to prevent unwanted and harmful effects.

Our proposal

In 2022 we have decided to implement a new PT:

PT for the research of Progesterone in Bovine Serum (SE2409)- Round of November

  • Deadline for online order: October 7th 2022
  • Shipping Date: November 21st 2022
  • 5ml x 2 Test Material
  • You can use the method you prefer: confirmatory (chromatographic method as HPLC) or screening (i.e. ELISA, lateral flow…). Will be evaluated quantitative, semi-quantitative and qualitative results.
  • In order to guarantee a high stability of the samples and to assure that that all participants receive them in the same conditions, the Test Materials are provided as lyophilized. However, the analysis should be considered as analysis on reconstituted serum.

Your needs are important!

We are always open to new ideas and suggestions. Our PT programme is flexible and one of our most important advantages is the versatility, for this reason we want to ask you to compile a very short survey (3 minutes) about requirements for progesterone PT. Hopefully we will implement your requirements in our programme, thus continuing to ensure the best possible service.

If you want to see more details about this or other PTs, such as the list of researched molecules, schedule, prices… go to this page to download the entire programme.

Here you can find information on HOW TO ORDER.

For any further information, do not hesitate to contact us at

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