Endocrinology Laboratory

Reproductive hormone testing for clinical and research applications

The Endocrinology Laboratory offers a variety of clinical tests to determine spay/neuter/cryptorchid status, pregnancy status, occurrence of ovulation, presence of tumors of the reproductive system, as well as other more specialized analytical technologies. Radioimmunoassay techniques are used to quantify hormones in biological fluids and tissues to evaluate pituitary function and target organ response. The lab provides clinical services to zoos, wildlife foundations, veterinarians, private breeders, and on occasion, law enforcement.

Researchers, clinicians, and pharmaceutical companies utilize our lab for studies requiring the most sensitive assays for detection of minute quantities of hormones in biological samples, and we are involved in various research studies pertaining to issues such as reproductive function and efficacy of treatments.​​

Many of the antibodies to hormones are generated on site, which minimizes costs for the analytical reagents, enabling us to offer these assays at a low price to our clients. Aliquots of lyophilized antisera to hormones are available for research purposes and will be sent to investigators upon request.

Test information, availability, and pricing

Samples must be received no later than Tuesday afternoon to be included in the assay schedule for that week. If you are sending large numbers of samples, please ship to arrive prior to Tuesday to allow laboratory personnel sufficient time for processing.

Results will be reported the following Monday afternoon. Use the reference values information sheet to interpret test results for progesterone, testosterone, and luteinizing hormone assays.

TestosteroneTestosterone info sheetEvery week$52
Progesterone (P4)P4 info sheetEvery week$52
Mare pregnancy test (MPT)MPT info sheetUpon request$52
Equine luteinizing hormone (eLH)eLH info sheetUpon request$46
Equine follicle stimulating hormone (eFSH)eFSH info sheetUpon request
CorticosteroneUpon request
CortisolUpon request
Estradiol (E2)Upon request
Follicle stimulating hormone (FSH)Upon request
Luteinizing hormone (LH)Upon request$46
Gonadotropin releasing hormone (GnRH)Upon request
InsulinUpon request
ProlactinUpon request
T3Upon request
T4Upon request

Submission forms

Please select the appropriate form below, fill out all of the information, and submit the form with the samples to be analyzed.

Clinical lab formUse when submitting 1-2 samples for progesterone, testosterone, luteinizing hormone or mare pregnancy test.
Multiple sample lab formUse when submitting more than two samples.
Mare pregnancy test lab formUse when submitting more than two samples for MPT.

Shipping information

With each shipment, please include the following:

If you would like the samples returned, please include a written request with the submission form indicating how the return shipment is to be billed.

Shipping instructions

Ship samples via overnight carrier (send chilled or frozen).  If shipped other than overnight, samples must be frozen or on dry ice.

Shipping address

Endocrinology Laboratory
ARBL/Foothills Campus
Colorado State University
Fort Collins, CO 80523-1683

Contact us

Phone: (970) 491-1645
Fax: (970) 491-3557
Email: endo-lab@colostate.edu
September-May: 8 a.m.-5 p.m.
June-August: 7:30 a.m.-4:30 p.m.

Our Team