is most often measured to check for tissue damage. LDH is in many body tissues, especially the heart, liver, kidney, muscles, brain, blood cells, and lungs. Other conditions for which the test may be done include: Low red blood cell count.

Measures the amount of LH in your bloodstream. If you’re a woman, the amount of this hormone in your bloodstream varies with age and throughout the menstrual cycle. It also changes with pregnancy. If a doctor orders a test for LH related to fertility, a woman may need multiple tests to track the rising and falling hormone levels. LH levels can also be measured by analyzing a urine sample.

If you’re a man, your doctor can order an LH test to establish a baseline LH level. Your doctor can also measure your LH level after giving you an injection of gonadotropin releasing hormon(GnRH). Measuring LH after receiving this hormone can tell your doctor if you have a problem with the pituitary gland or with another part of your body.