609 Abstract: In order to determine the seminal activity of LDH-C4 and to investigate its correlation with other fertility indexes, we studed total LDH, total CK avtivities, and LDH-C4 in relation to sperm count, motility and sperm motility index (SMI). SMI is the measurement of electro-optical fluctuations caused by motile sperm. Total LDH and total CK were determined with a Technicon RA 1000 ...