HCG Stimulation Test

LABOKLIN Service ID: 1360


  • Detection of endocrine active tissue of the gonads (ovary, testis).
  • Cryptorchidism

Serum 2 x 0.5 ml


  • First blood collection = baseline value (testosterone)
  • Injection of 500 IU of HCG (Ovogest®)/dog i.v. respectively 5000 - 10000 IU/horse i.v. .
  • Second sample after 1 hour = stimulation value
  • (dog: perhaps additional sample after 30 minutes)


Testosterone (male)

Species list

Dog, cat, horse


1 day


  • In most cases, the determination of the AMH level (see category Endocrinology / Tumour Markers) provides comparable information.
  • Male dog: post-stimulation testosterone concentrations > 1.0 ng/ml indicate that there is testicular tissue.
  • Stallion: Testosterone concentrations between 0.05 and 0.1 ng/ml after stimulation are considered as borderline and need further clarification – e.g. by determining the anti-Müllerian hormone. Higher values indicate the existence of testicular tissue.