The nursing shortage is not a temporary post-pandemic disruption that will self-correct. That's the finding of a peer-reviewed study published February 24, 2026, in the journal Medical Care by researchers Karen B. Lasater, Matthew D. McHugh, and Linda H. Aiken at the University of Pennsylvania's Leonard Davis Institute of Health Economics.
The study — "Hospital Nursing Has Not Returned to Pre-COVID Conditions" — analyzed hospital nursing workforce data and found that nurse workloads have increased since the pandemic, vacancy rates average 8% nationwide, turnover sits at approximately 16%, and conditions at the bedside remain significantly worse than pre-2020 baseline. The researchers conclude that without structural policy intervention, the shortage will persist.
The Numbers Behind the Headline
A 16% nurse turnover rate means roughly 1 in 6 hospital nurses is leaving their employer every year. At an 8% vacancy rate, approximately 1 in 12 nursing positions in a typical hospital is unfilled. These aren't abstract percentages — they translate to the number of patients assigned to each nurse per shift, the frequency of mandatory overtime, and the level of support available when a patient deteriorates.
The researchers found that nurse workloads — patients per nurse — have increased since the pandemic. Hospitals responded to the COVID crisis by leaning on remaining nurses to carry more, and that lean-in has not been unwound. The data contradicts the narrative from some hospital administrators that the workforce has largely normalized.
The study also identifies inadequate staffing as a primary driver of nurse departures. When nurses leave, hospitals must either operate with vacancies, hire expensive agency and travel nurses, or mandate overtime from remaining staff — all of which accelerate further departures from the remaining permanent workforce.
What the Researchers Recommend
Lasater and colleagues make two specific policy recommendations. First, they suggest hospitals pursue Magnet Recognition Program status, which requires demonstrating workforce investments and shared governance structures that correlate with better nurse retention. Second — and more directly — they recommend policymakers require minimum hospital-wide staffing ratios.
The staffing ratio recommendation is the most structurally significant. California is the only state with a legislatively mandated minimum nurse-to-patient ratio for all hospital units. Oregon enacted a ratio law in 2023. Studies from both states link ratios to improved nurse retention and reduced patient adverse events — the intervention works when implemented with enforcement.
Without a mandatory floor, individual hospitals make staffing decisions based on budget, not on patient safety evidence. The Penn researchers' data shows where that leads: worse conditions, higher turnover, higher vacancy, and a self-reinforcing cycle that the workforce data indicates has been running since 2020.
Context: The 2026 NCSBN Scan
The Penn study's findings align with the NCSBN's 2026 Environmental Scan, published earlier this year, which projects the U.S. will be short approximately 263,870 registered nurses in 2026 — an 8% gap. The NCSBN scan also found that approximately 40% of all nurses plan to leave nursing or retire within the next five years.
That 40% figure is the most alarming datapoint in the current workforce literature. It suggests the shortage is not simply a matter of supply pipeline — nursing school enrollment has actually increased — but of accelerating attrition from the existing workforce due to conditions at the bedside.
This study is significant because it's peer-reviewed and it directly contradicts the "things are normalizing" message that hospital administrators and some health systems have been pushing since 2023. The data says workloads are higher than pre-COVID, not lower. For nurses negotiating contract renewals, requesting float coverage, or making decisions about whether to stay at the bedside, the workforce data matters: you are not imagining it. The conditions are measurably worse, the vacancy rates are real, and the pressure you feel on a busy shift is documented in the literature. The political question is whether mandatory ratios — the intervention the evidence actually supports — will gain legislative traction in more states. California and Oregon have shown the concept works. The remaining question is will is whether legislatures in other states have the will to enact it against hospital industry opposition.