HP – Hypothalamic-pituitary Neurotransmitter Function – this test is for anyone exhibiting symptoms of abnormal or suboptimal brain chemicals. Depression, anxiety, irritability, loss of drive or focus, energy or libido. This test is also especially useful for anyone considering taking medications for these symptoms and also to monitor any current medication regimen. This test measures levels of Serotonin, GABA, Epinephrine, Norepinephrine, and Dopamine. There are other neurotransmitters available to be tested. This can be determined by a medical professional. This is a urine test and one sample is collected. Instructions are included.