<prompt> Earliest pregnancy is detected byb-HCGUltrasoundFoetal movementsFoetal heart sound  <response>: A. i.e. b hCG 67-69- Dutta 6thImmunological Test for Diagnosis of Pregnancy Immunological Tests UrinePositive on Agglutination inhibition test Latex test2 days after missed period Direct latex agglutination test2-3 days after missed period Card testOn the first day of the missed periodELISA5 days before the first missed period Radioimmunoassay b-subunit 25th day of cycle Immuno- radiometric assay IRMA8 days after conceptionULTRASONOGRAPHY - Intradecidual gestational sac GS is identified as early as 29 to 35 days of gestation Gestational sac and yolk sac - 5 menstrual weeks Fetal pole and cardiac activity - 6 weeks Embryonic movements - 7 weeks Fetal gestational age is best determined by measuring the RL between 7 and 12 weeks variation 5 days Doppler effect of ultrasound can pick up the fetal heart rate reliably by 10th week. Active fetal movements can be felt at intervals by placing the hand over the uterus as early as 20th week.It not only gives positive evidence ofpregnancy but of a live fetus b- hCG- is marker of Dysgerminoma Inhibin is marker for Granulosa cell tumour The secreening test for gestational diabetes mellitus has the highest sensitivity is - 50 gram glucose challenge test 