Feature of hemorrhagic disease of new born is ?
Prolonged prothrombin time
Defective platelet count
Prolonged bleeding time
Prolonged thrombin time
Ans. is 'a' i.e., Prolonged prothrombine timeo Normal new borns are moderately deficient in vitamin K.o This deficiency increases on 3'd 51h day when, vitamin K level falls fuher. The serum level of vitamin K stas increasing from 13th to 15th day of life and achieves adult level at 3 months.o This is normal, and does not produce any bleeding.o In hemorrhagic disease of the newborn there is delay in achieving the normal vitamin K level. Clinical Featureso Vitamin K deficiency produces severe bleeding.o Bleeding occurs from umbilical cord stump on 2"d/3rd day after bih.o Intracranial bleding and large intramuscular hemorrhages may occur.o Increased prothrombin time and increased paial thromboplastin time.T/To Parenteral vitamin K therapy.