The Rs 479.21-crore IPO received bids for 77,30,514 shares against the total issue size of 75,21,297 shares, as per the NSE data till 1200 hrs.
The firm, which runs a diagnostics laboratory chain across the country, has come out with a public issue of up to 10,744,708 shares of Rs 10 each.
The company's IPO is scheduled to close tomorrow.
It has fixed a price band of Rs 420 to Rs 446 for the issue. The company will garner around Rs 479.21 crore at the upper end of the price band.
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It competes with diagnostics chains such as Dr Lal PathLabs, SRL Diagnostics, Metropolis Healthcare and Apollo Clinic.
The shares are proposed to be listed on NSE and BSE.
The issue is being managed by JM Financial Institutional Securities, Edelweiss Financial Services and ICICI Securities.
Several healthcare firms like Alkem Laboratories, Dr Lal PathLabs and Narayana Hrudayalaya came out with their IPOs last year, while HealthCare Global Enterprises got listed on the stock exchanges last month.