Abstract: The invention provides a test kit and a test method using the same. The test kit utilized for detecting the neutralizing antibody against COVID-19 has high sensitivity and specificity. The test kit especially comprises antigen-complex that essentially consists of a receptor binding domain (RBD) located in COVID-19 spike glycoprotein, two N-terminal domains located in COVID-19 spike glycoprotein and a domain between the RBD and the N-terminal domain (NTD). The test kit may quantitatively determine the titer of the neutralizing antibody against COVID-19.

Abstract: A urine collector for urinalysis includes a cup portion and a handle portion outward extended from an upper edge of the cup portion. A peripheral wall of the cup portion includes an inclined area downward and inward extended from a joint of the cup and the handle portions to a predetermined point, so that a distance exists between a lower end of the inclined area and a bottom of the cup portion. The peripheral wall below the lower end of the inclined area is bent to provide a stopper in front of the lower end of the inclined area. Pour spouts are provided on the upper edge of the cup portion to facilitate dispensing of urine collected in the cup portion. The handle portion enables convenient and sanitary holding of the urine collector. The stopper and the bottom of the cup portion provide two different depths of the cup portion relative to the upper edge thereof, adapting the urine collector to testing strips for routine urinalysis and pregnancy test.