Collagen is a hard, insoluble and fibrous protein that makes up one-third of the protein in the human body. 3 In the majority of collagens, the molecules are packed together to form very similar long thin fibrils. 4. Collagen is the most common protein found in mammals.ere are some key points about collagen. More detail and supporting information is in the main article. 25-27. 1  Protein makes up around 20% of the body's mass, and collagen makes up around 30% of the protein in the human body.
A prolactin test is a blood test that measures the level of the hormone in your body. Find a obsetrician or a gynecologist or a endocrinologist near you.
High values. 1  High levels of prolactin (usually higher than 200 ng/mL) may mean a pituitary gland tumor (prolactinoma) is present. 2  The higher the prolactin level, the more likely a pituitary gland tumor is present. If a prolactin level is over 200 ng/mL, a magnetic resonance imaging (MRI) test may be done to confirm a pituitary tumor is present. 2  A normal or low prolactin level does not always mean there is no pituitary tumor. 3  An MRI test may be done if a pituitary tumor is suspected.