URINALYSIS The dipstick test was unremarkable. USG by refractometry= 1.034; pH = 9.0. Image: Urine sediment analysis, unstained urine sample , ×40 What are the boat-shaped to ovoid structures? 2 What is the origin of the spherical structure? 3 What happens when diluted (5–10%) acetic acid is added to the sediment? 4 What is the clinical importance of these structures?