Quest Diagnostics Inc. is looking to borrow $800 million in debt.

The Secaucus, N.J.-based company said it priced a public offering of 2.95% senior notes due 2030 to raise the amount which would primarily be used to repay its 4.75% and 2.50% senior notes due 2020.

The offering is expected to close Dec. 16, subject to customary closing conditions.

In March, the company priced a separate senior notes offering to raise $500 million. That amount was used to repay $300 million of previous debt and notes, and for general corporate purposes.