X0304 4 2012-03-19 0 0000353569 QUIDEL CORP /DE/ QDEL 0001021412 SCHULER JACK W 10165 MCKELLAR COURT SAN DIEGO CA 92121 1 0 0 0 Common Stock 2012-03-19 4 P 0 10000 16.5954 A 3255650 D Common Stock 2012-03-20 4 P 0 15815 16.4766 A 3271465 D Common Stock 2012-03-21 4 P 0 40000 16.6482 A 3311465 D The shares reported on this Form 4 were purchased by the Jack W. Schuler Living Trust. The weighted average purchase price for these transactions was $16.5954 per share, with a range of $16.55 to $16.60 per share. Upon request, the Reporting Person hereby undertakes to provide to staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder, the full information regarding the number of shares purchased at each separate price. In addition to the shares reported on this Form 4 as directly owned by the Reporting Person, 65,000 shares are held indirectly by the Reporting's spouse, 441,961 shares are held indirectly by the Schuler Family Foundation, and 683,843 shares are held indirectly by trusts for the benefit of the Reporting Person's children. The Reporting Person disclaims all beneficial ownership of the shares owned by his spouse and the trusts for the benefit of his children, except to the extent of his pecuniary interest, if any. The weighted average purchase price for these transactions was $16.4766 per share, with a range of $16.41 to $16.51 per share. Upon request, the Reporting Person hereby undertakes to provide to staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder, the full information regarding the number of shares purchased at each separate price. The weighted average purchase price for these transactions was $16.6482 per share, with a range of $16.465 to $16.75 per share. Upon request, the Reporting Person hereby undertakes to provide to staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder, the full information regarding the number of shares purchased at each separate price. Robert J. Bujarski, attorney-in-face for Jack W. Schuler 2012-03-21