Health Lead story A frozen section brings the microscope into the operation Freezing makes a tissue sample firm enough to examine while surgery is still underway. Following it through the cryostat explains what a rapid answer can change, why a clear slide can still miss disease, and why the examination continues afterward.
Health Oct. 26 Passing the donor hemoglobin check leaves an iron question open A blood donor can have enough hemoglobin to donate while iron reserves are running low. Four decades of research separate screening, recovery and donation frequency—and show why a passing result cannot answer every question about iron.
Health Oct. 25 Moseley's knee trial asked what the operation added A simulated operation helped separate improvement after knee surgery from benefit caused by work inside the joint. Reading Moseley's trial alongside later evidence shows what its control established, what it left unresolved, and why the distinction matters.
Health Oct. 25 A dialyzer removes waste and water by different routes Inside a dialysis cartridge, concentration differences move dissolved waste while pressure moves water. Following the two processes explains why fluid removal needs its own prescription—and why the water outside the blood circuit matters.
