I have my pen out, ready to arrange for some further tests and write an order for hematin, to help reduce the demand for heme and thereby lower porphyrin levels.    From Wordnik.com.  [After the Diagnosis] Reference

Menstrual blood loss was measured by alkaline-hematin assay (n = 12, > 80 ml (HMB); n = 17, < 80 ml).    From Wordnik.com.  [The Journal of Clinical Endocrinology & Metabolism Current Issue] Reference

E. tarda has developed abilities to utilize hemin, hemoglobin and hematin as iron source as well as siderophore-mediated iron uptake mechanism.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference