Which is a not an essential criteria according to WHO for normal semen analysis

Volume > 1 ml THE W.H.O. RECOMMENDS THE FOLLOWING NORMAL VALUES Volume Sperm Total sperm number Percent mobility Forward progression Normal morphology Round cells Sperm agglutination > 2 ml concentration > 20 million / ml or more > 40 million/ejaculate > 50% with forward progression > 25% with rapid linear progression > 2 (scale 0-4) > 30% normal (W.H.O. criteria) > 14% normal (Kruger and strict criteria) < 5 million/rnl < 2 (scale 0-3),w.b.c fewer than I x106 / ml The normal sperm morphology is currently being reassessed by W.H.O In the interim the propoion of normal forms accepted by the laboratories in the U.K is either the earlier W.H.O limits of 30 or 15% based on strict morphological criteria.